Common Weakness Enumeration
CWE-208
AllowedObservable Timing Discrepancy
Abstraction: Base · Status: Incomplete
Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.
356 vulnerabilities reference this CWE, most recent first.
CVE-2026-41515 (GCVE-0-2026-41515)
Vulnerability from cvelistv5 – Published: 2026-07-06 19:25 – Updated: 2026-07-07 14:09
VLAI
EPSS
VEX
Title
OP-TEE: RSA-OAEP padding oracle in NXP CAAM driver enables plaintext recovery
Summary
OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on Arm; Cortex-A cores using the TrustZone technology. Starting in version 3.9.0 and prior to version 4.11.0, the RSA-OAEP decryption implementation in the NXP CAAM crypto driver uses non-constant-time `memcmp()` for label hash verification and has multiple distinguishable error paths. This creates a Manger-style padding oracle that allows an attacker to recover RSA-OAEP plaintext with approximately 1000-2000 adaptive chosen ciphertext queries. Version 4.11.0 contains a patch. As a workaround, disable the NXP CAAM RSA driver with `CFG_CRYPTO_DRV_RSA=n`.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-07 14:09 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/OP-TEE/optee_os/security/advis… | x_refsource_CONFIRM |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-41515",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-07T14:09:21.542493Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-07T14:09:30.230Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "optee_os",
"vendor": "OP-TEE",
"versions": [
{
"status": "affected",
"version": "\u003e= 3.9.0, \u003c 4.11.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on Arm; Cortex-A cores using the TrustZone technology. Starting in version 3.9.0 and prior to version 4.11.0, the RSA-OAEP decryption implementation in the NXP CAAM crypto driver uses non-constant-time `memcmp()` for label hash verification and has multiple distinguishable error paths. This creates a Manger-style padding oracle that allows an attacker to recover RSA-OAEP plaintext with approximately 1000-2000 adaptive chosen ciphertext queries. Version 4.11.0 contains a patch. As a workaround, disable the NXP CAAM RSA driver with `CFG_CRYPTO_DRV_RSA=n`."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 2.5,
"baseSeverity": "LOW",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-208",
"description": "CWE-208: Observable Timing Discrepancy",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-06T19:25:10.934Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/OP-TEE/optee_os/security/advisories/GHSA-5q45-58r5-cq4g",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/OP-TEE/optee_os/security/advisories/GHSA-5q45-58r5-cq4g"
}
],
"source": {
"advisory": "GHSA-5q45-58r5-cq4g",
"discovery": "UNKNOWN"
},
"title": "OP-TEE: RSA-OAEP padding oracle in NXP CAAM driver enables plaintext recovery"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-41515",
"datePublished": "2026-07-06T19:25:10.934Z",
"dateReserved": "2026-04-20T18:18:50.681Z",
"dateUpdated": "2026-07-07T14:09:30.230Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-41514 (GCVE-0-2026-41514)
Vulnerability from cvelistv5 – Published: 2026-07-06 19:06 – Updated: 2026-07-07 16:57
VLAI
EPSS
VEX
Title
OP-TEE: RSA-OAEP padding oracle in Hisilicon HPRE driver enables plaintext recovery
Summary
OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on Arm; Cortex-A cores using the TrustZone technology. Starting in version 4.5.0 and prior to version 4.11.0, the RSA-OAEP decryption implementation in the Hisilicon HPRE crypto driver uses non-constant-time `memcmp()` for label hash verification and has multiple distinguishable error paths. This creates a Manger-style padding oracle that allows an attacker to recover RSA-OAEP plaintext with approximately 1000-2000 adaptive chosen ciphertext queries. Only affects plat-d06 with `CFG_HISILICON_ACC_V3=y`, which seems to be disabled by default. Version 4.11.0 contains a patch. As a workaround, disable Hisilicon HPRE RSA driver with `CFG_HISILICON_ACC_V3=n`.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-07 16:45 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/OP-TEE/optee_os/security/advis… | x_refsource_CONFIRM |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-41514",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-07T16:45:05.770597Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-07T16:57:46.440Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "optee_os",
"vendor": "OP-TEE",
"versions": [
{
"status": "affected",
"version": "\u003e= 4.5.0, \u003c 4.11.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on Arm; Cortex-A cores using the TrustZone technology. Starting in version 4.5.0 and prior to version 4.11.0, the RSA-OAEP decryption implementation in the Hisilicon HPRE crypto driver uses non-constant-time `memcmp()` for label hash verification and has multiple distinguishable error paths. This creates a Manger-style padding oracle that allows an attacker to recover RSA-OAEP plaintext with approximately 1000-2000 adaptive chosen ciphertext queries. Only affects plat-d06 with `CFG_HISILICON_ACC_V3=y`, which seems to be disabled by default. Version 4.11.0 contains a patch. As a workaround, disable Hisilicon HPRE RSA driver with `CFG_HISILICON_ACC_V3=n`."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 2.5,
"baseSeverity": "LOW",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-208",
"description": "CWE-208: Observable Timing Discrepancy",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-06T19:06:36.943Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/OP-TEE/optee_os/security/advisories/GHSA-qw4r-9wj9-q23r",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/OP-TEE/optee_os/security/advisories/GHSA-qw4r-9wj9-q23r"
}
],
"source": {
"advisory": "GHSA-qw4r-9wj9-q23r",
"discovery": "UNKNOWN"
},
"title": "OP-TEE: RSA-OAEP padding oracle in Hisilicon HPRE driver enables plaintext recovery"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-41514",
"datePublished": "2026-07-06T19:06:36.943Z",
"dateReserved": "2026-04-20T18:18:50.681Z",
"dateUpdated": "2026-07-07T16:57:46.440Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-41418 (GCVE-0-2026-41418)
Vulnerability from cvelistv5 – Published: 2026-04-24 18:49 – Updated: 2026-04-24 19:59
VLAI
EPSS
VEX
Title
4ga Boards: User Enumeration via Timing Side-Channel in Authentication Endpoint
Summary
4ga Boards is a boards system for realtime project management. Prior to 3.3.5, 4ga Boards is vulnerable to user enumeration via a timing side-channel in the login endpoint (POST /api/access-tokens). When an invalid username/email is provided, the server responds immediately (~17ms average). When a valid username/email is provided with an incorrect password, the server first performs a bcrypt.compareSync() operation (~74ms average) before responding. This ~4.4× timing difference is trivially detectable even over a network — a single request suffices. This vulnerability is fixed in 3.3.5.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-24 19:59 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/RARgames/4gaBoards/security/ad… | x_refsource_CONFIRM |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-41418",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-24T19:59:01.749147Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T19:59:10.069Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "4gaBoards",
"vendor": "RARgames",
"versions": [
{
"status": "affected",
"version": "\u003c 3.3.5"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "4ga Boards is a boards system for realtime project management. Prior to 3.3.5, 4ga Boards is vulnerable to user enumeration via a timing side-channel in the login endpoint (POST /api/access-tokens). When an invalid username/email is provided, the server responds immediately (~17ms average). When a valid username/email is provided with an incorrect password, the server first performs a bcrypt.compareSync() operation (~74ms average) before responding. This ~4.4\u00d7 timing difference is trivially detectable even over a network \u2014 a single request suffices. This vulnerability is fixed in 3.3.5."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-208",
"description": "CWE-208: Observable Timing Discrepancy",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T18:49:38.599Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/RARgames/4gaBoards/security/advisories/GHSA-8mj9-p99h-jhxp",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/RARgames/4gaBoards/security/advisories/GHSA-8mj9-p99h-jhxp"
}
],
"source": {
"advisory": "GHSA-8mj9-p99h-jhxp",
"discovery": "UNKNOWN"
},
"title": "4ga Boards: User Enumeration via Timing Side-Channel in Authentication Endpoint"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-41418",
"datePublished": "2026-04-24T18:49:38.599Z",
"dateReserved": "2026-04-20T15:32:33.813Z",
"dateUpdated": "2026-04-24T19:59:10.069Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-41407 (GCVE-0-2026-41407)
Vulnerability from cvelistv5 – Published: 2026-04-28 18:10 – Updated: 2026-04-30 12:53 X_Open Source
VLAI
EPSS
VEX
Title
OpenClaw < 2026.4.2 - Timing Side Channel in Shared-Secret Comparison
Summary
OpenClaw before 2026.4.2 contains a timing side channel vulnerability in shared-secret comparison call sites that use early length-mismatch checks instead of fixed-length comparison helpers. Attackers can measure timing differences to leak secret-length information, weakening constant-time handling for shared secrets.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-30 12:53 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/openclaw/openclaw/security/adv… | vendor-advisory |
| https://github.com/openclaw/openclaw/commit/be10e… | patch |
| https://www.vulncheck.com/advisories/openclaw-tim… | third-party-advisory |
Impacted products
Date Public
2026-04-02 00:00
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-41407",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-30T12:53:09.049114Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-30T12:53:19.636Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"packageURL": "pkg:npm/openclaw",
"product": "OpenClaw",
"vendor": "OpenClaw",
"versions": [
{
"lessThan": "2026.4.2",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "2026.4.2",
"versionType": "semver"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:*",
"versionEndExcluding": "2026.4.2",
"vulnerable": true
}
],
"operator": "OR"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "reporter",
"value": "KEXNA (@kexinoh)"
}
],
"datePublic": "2026-04-02T00:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "OpenClaw before 2026.4.2 contains a timing side channel vulnerability in shared-secret comparison call sites that use early length-mismatch checks instead of fixed-length comparison helpers. Attackers can measure timing differences to leak secret-length information, weakening constant-time handling for shared secrets."
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "HIGH",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 6.3,
"baseSeverity": "MEDIUM",
"exploitMaturity": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "LOW",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
},
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 3.7,
"baseSeverity": "LOW",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-208",
"description": "CWE-208 Observable Timing Discrepancy",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-28T18:10:04.932Z",
"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"shortName": "VulnCheck"
},
"references": [
{
"name": "GitHub Security Advisory (GHSA-jj6q-rrrf-h66h)",
"tags": [
"vendor-advisory"
],
"url": "https://github.com/openclaw/openclaw/security/advisories/GHSA-jj6q-rrrf-h66h"
},
{
"name": "Patch Commit",
"tags": [
"patch"
],
"url": "https://github.com/openclaw/openclaw/commit/be10ecef770a4654519869c3641bbb91087c8c7b"
},
{
"name": "VulnCheck Advisory: OpenClaw \u003c 2026.4.2 - Timing Side Channel in Shared-Secret Comparison",
"tags": [
"third-party-advisory"
],
"url": "https://www.vulncheck.com/advisories/openclaw-timing-side-channel-in-shared-secret-comparison"
}
],
"tags": [
"x_open-source"
],
"title": "OpenClaw \u003c 2026.4.2 - Timing Side Channel in Shared-Secret Comparison",
"x_generator": {
"engine": "vulncheck"
}
}
},
"cveMetadata": {
"assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"assignerShortName": "VulnCheck",
"cveId": "CVE-2026-41407",
"datePublished": "2026-04-28T18:10:04.932Z",
"dateReserved": "2026-04-20T14:15:22.223Z",
"dateUpdated": "2026-04-30T12:53:19.636Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-41263 (GCVE-0-2026-41263)
Vulnerability from cvelistv5 – Published: 2026-04-30 20:39 – Updated: 2026-05-01 14:22
VLAI
EPSS
VEX
Title
Traefik: BasicAuth middleware: timing side-channel vulnerability
Summary
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a timing side-channel vulnerability in Traefik's BasicAuth middleware that allows an attacker to enumerate valid usernames through response-time differences. The variable intended to hold a constant-time fallback secret always resolves to an empty string, causing the constant-time comparison to short-circuit in microseconds rather than performing a full bcrypt evaluation. This restores the original timing oracle and makes it possible to distinguish existing users from non-existing ones by measuring authentication response times. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-01 14:22 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/traefik/traefik/security/advis… | x_refsource_CONFIRM |
| https://github.com/traefik/traefik/releases/tag/v… | x_refsource_MISC |
| https://github.com/traefik/traefik/releases/tag/v3.6.14 | x_refsource_MISC |
| https://github.com/traefik/traefik/releases/tag/v… | x_refsource_MISC |
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-41263",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-01T14:22:30.689474Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-01T14:22:40.566Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "traefik",
"vendor": "traefik",
"versions": [
{
"status": "affected",
"version": "\u003c 2.11.43"
},
{
"status": "affected",
"version": "\u003e= 3.0.0-beta1, \u003c 3.6.14"
},
{
"status": "affected",
"version": "\u003e= 3.7.0-ea.1, \u003c 3.7.0-rc.2"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a timing side-channel vulnerability in Traefik\u0027s BasicAuth middleware that allows an attacker to enumerate valid usernames through response-time differences. The variable intended to hold a constant-time fallback secret always resolves to an empty string, causing the constant-time comparison to short-circuit in microseconds rather than performing a full bcrypt evaluation. This restores the original timing oracle and makes it possible to distinguish existing users from non-existing ones by measuring authentication response times. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "HIGH",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 6.3,
"baseSeverity": "MEDIUM",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "LOW",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-208",
"description": "CWE-208: Observable Timing Discrepancy",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-30T20:39:49.658Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/traefik/traefik/security/advisories/GHSA-6x2q-h3cr-8j2h",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/traefik/traefik/security/advisories/GHSA-6x2q-h3cr-8j2h"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v2.11.43",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v2.11.43"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v3.6.14",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v3.6.14"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2"
}
],
"source": {
"advisory": "GHSA-6x2q-h3cr-8j2h",
"discovery": "UNKNOWN"
},
"title": "Traefik: BasicAuth middleware: timing side-channel vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-41263",
"datePublished": "2026-04-30T20:39:49.658Z",
"dateReserved": "2026-04-18T14:01:46.801Z",
"dateUpdated": "2026-05-01T14:22:40.566Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-41244 (GCVE-0-2026-41244)
Vulnerability from cvelistv5 – Published: 2026-04-24 19:11 – Updated: 2026-04-24 19:59
VLAI
EPSS
VEX
Title
Mojic: Observable Timing Discrepancy in HMAC Verification
Summary
Mojic is a CLI tool to transform readable C code into an unrecognizable chaotic stream of emojis. Prior to 2.1.4, the CipherEngine uses a standard equality operator (!==) to verify the HMAC-SHA256 integrity seal during the decryption phase. This creates an Observable Timing Discrepancy (CWE-208), allowing a potential attacker to bypass the file integrity check via a timing attack. This vulnerability is fixed in 2.1.4.
Severity
4.7 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-24 19:59 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/notamitgamer/mojic/security/ad… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| notamitgamer | mojic |
Affected:
< 2.1.4
|
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-41244",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-24T19:59:29.940685Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T19:59:59.355Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://github.com/notamitgamer/mojic/security/advisories/GHSA-wqq3-wfmp-v85g"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "mojic",
"vendor": "notamitgamer",
"versions": [
{
"status": "affected",
"version": "\u003c 2.1.4"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Mojic is a CLI tool to transform readable C code into an unrecognizable chaotic stream of emojis. Prior to 2.1.4, the CipherEngine uses a standard equality operator (!==) to verify the HMAC-SHA256 integrity seal during the decryption phase. This creates an Observable Timing Discrepancy (CWE-208), allowing a potential attacker to bypass the file integrity check via a timing attack. This vulnerability is fixed in 2.1.4."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 4.7,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-208",
"description": "CWE-208: Observable Timing Discrepancy",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T19:11:54.892Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/notamitgamer/mojic/security/advisories/GHSA-wqq3-wfmp-v85g",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/notamitgamer/mojic/security/advisories/GHSA-wqq3-wfmp-v85g"
}
],
"source": {
"advisory": "GHSA-wqq3-wfmp-v85g",
"discovery": "UNKNOWN"
},
"title": "Mojic: Observable Timing Discrepancy in HMAC Verification"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-41244",
"datePublished": "2026-04-24T19:11:54.892Z",
"dateReserved": "2026-04-18T03:47:03.135Z",
"dateUpdated": "2026-04-24T19:59:59.355Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-41161 (GCVE-0-2026-41161)
Vulnerability from cvelistv5 – Published: 2026-05-08 13:00 – Updated: 2026-05-11 18:24
VLAI
EPSS
VEX
Title
Username Enumeration via Timing Attack
Summary
Sync-in Server is a secure, open-source platform for file storage, sharing, collaboration, and syncing. Prior to version 2.2.0, the /api/auth/login endpoint contains a logic flaw that allows unauthenticated remote attackers to enumerate valid usernames by measuring the application's response time. This issue has been patched in version 2.2.0.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-11 18:23 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/Sync-in/server/security/adviso… | x_refsource_CONFIRM |
| https://github.com/Sync-in/server/releases/tag/v2.2.0 | x_refsource_MISC |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-41161",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-11T18:23:52.865549Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-11T18:24:40.217Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://github.com/Sync-in/server/security/advisories/GHSA-43fj-qp3h-hrh5"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "server",
"vendor": "Sync-in",
"versions": [
{
"status": "affected",
"version": "\u003c 2.2.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Sync-in Server is a secure, open-source platform for file storage, sharing, collaboration, and syncing. Prior to version 2.2.0, the /api/auth/login endpoint contains a logic flaw that allows unauthenticated remote attackers to enumerate valid usernames by measuring the application\u0027s response time. This issue has been patched in version 2.2.0."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 6.9,
"baseSeverity": "MEDIUM",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "LOW",
"vulnIntegrityImpact": "NONE"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-208",
"description": "CWE-208: Observable Timing Discrepancy",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-08T13:00:54.485Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/Sync-in/server/security/advisories/GHSA-43fj-qp3h-hrh5",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/Sync-in/server/security/advisories/GHSA-43fj-qp3h-hrh5"
},
{
"name": "https://github.com/Sync-in/server/releases/tag/v2.2.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/Sync-in/server/releases/tag/v2.2.0"
}
],
"source": {
"advisory": "GHSA-43fj-qp3h-hrh5",
"discovery": "UNKNOWN"
},
"title": "Username Enumeration via Timing Attack"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-41161",
"datePublished": "2026-05-08T13:00:54.485Z",
"dateReserved": "2026-04-17T16:34:45.524Z",
"dateUpdated": "2026-05-11T18:24:40.217Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-40972 (GCVE-0-2026-40972)
Vulnerability from cvelistv5 – Published: 2026-04-27 23:15 – Updated: 2026-04-29 03:55
VLAI
EPSS
VEX
Summary
An attacker on the same network as the remote application may be able to utilize a timing attack to discover information about the remote secret. In extreme circumstances this could result in the attacker determining the secret and uploading changed classes, thereby achieving remote code execution in the remote application.
Affected: Spring Boot 4.0.0–4.0.5 (fix 4.0.6), 3.5.0–3.5.13 (fix 3.5.14), 3.4.0–3.4.15 (fix 3.4.16), 3.3.0–3.3.18 (fix 3.3.19), 2.7.0–2.7.32 (fix 2.7.33); DevTools remote secret comparison. Versions that are no longer supported are also affected per vendor advisory.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-28 00:00 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Spring | Spring Boot |
Affected:
4.0.0 , < 4.0.6
(custom)
Affected: 3.5.0 , < 3.5.14 (custom) Affected: 3.4.0 , < 3.4.16 (custom) Affected: 3.3.0 , < 3.3.19 (custom) Affected: 2.7.0 , < 2.7.33 (custom) |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-40972",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-28T00:00:00+00:00",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-29T03:55:44.263Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"modules": [
"spring-boot-devtools"
],
"product": "Spring Boot",
"vendor": "Spring",
"versions": [
{
"lessThan": "4.0.6",
"status": "affected",
"version": "4.0.0",
"versionType": "custom"
},
{
"lessThan": "3.5.14",
"status": "affected",
"version": "3.5.0",
"versionType": "custom"
},
{
"lessThan": "3.4.16",
"status": "affected",
"version": "3.4.0",
"versionType": "custom"
},
{
"lessThan": "3.3.19",
"status": "affected",
"version": "3.3.0",
"versionType": "custom"
},
{
"lessThan": "2.7.33",
"status": "affected",
"version": "2.7.0",
"versionType": "custom"
}
]
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eAn attacker on the same network as the remote application may be able to utilize a timing attack to discover information about the remote secret. In extreme circumstances this could result in the attacker determining the secret and uploading changed classes, thereby achieving remote code execution in the remote application.\u003c/p\u003e\u003cp\u003eAffected: Spring Boot 4.0.0\u20134.0.5 (fix 4.0.6), 3.5.0\u20133.5.13 (fix 3.5.14), 3.4.0\u20133.4.15 (fix 3.4.16), 3.3.0\u20133.3.18 (fix 3.3.19), 2.7.0\u20132.7.32 (fix 2.7.33); DevTools remote secret comparison. Versions that are no longer supported are also affected per vendor advisory.\u003c/p\u003e"
}
],
"value": "An attacker on the same network as the remote application may be able to utilize a timing attack to discover information about the remote secret. In extreme circumstances this could result in the attacker determining the secret and uploading changed classes, thereby achieving remote code execution in the remote application.\n\nAffected: Spring Boot 4.0.0\u20134.0.5 (fix 4.0.6), 3.5.0\u20133.5.13 (fix 3.5.14), 3.4.0\u20133.4.15 (fix 3.4.16), 3.3.0\u20133.3.18 (fix 3.3.19), 2.7.0\u20132.7.32 (fix 2.7.33); DevTools remote secret comparison. Versions that are no longer supported are also affected per vendor advisory."
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "Per CVSS v3.1: Confidentiality HIGH; Integrity HIGH; Availability HIGH."
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-208",
"description": "CWE-208: Observable Timing Discrepancy",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-27T23:15:19.194Z",
"orgId": "dcf2e128-44bd-42ed-91e8-88f912c1401d",
"shortName": "vmware"
},
"references": [
{
"url": "https://spring.io/security/cve-2026-40972"
}
],
"source": {
"discovery": "UNKNOWN"
},
"x_generator": {
"engine": "Vulnogram 1.0.1"
}
}
},
"cveMetadata": {
"assignerOrgId": "dcf2e128-44bd-42ed-91e8-88f912c1401d",
"assignerShortName": "vmware",
"cveId": "CVE-2026-40972",
"datePublished": "2026-04-27T23:15:19.194Z",
"dateReserved": "2026-04-16T02:18:56.133Z",
"dateUpdated": "2026-04-29T03:55:44.263Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-40263 (GCVE-0-2026-40263)
Vulnerability from cvelistv5 – Published: 2026-04-16 23:53 – Updated: 2026-04-17 12:23
VLAI
EPSS
VEX
Title
Note Mark: Username Enumeration via Login Endpoint Timing Side-Channel
Summary
Note Mark is an open-source note-taking application. In versions 0.19.1 and prior, the login endpoint performs bcrypt password verification only when the supplied username exists, returning immediately for nonexistent usernames. This timing discrepancy allows unauthenticated attackers to enumerate valid usernames by measuring response times, enabling targeted credential attacks. This issue has been fixed in version 0.19.2.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-17 12:23 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/enchant97/note-mark/security/a… | x_refsource_CONFIRM |
| https://github.com/enchant97/note-mark/commit/cf4… | x_refsource_MISC |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-40263",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-17T12:23:37.345690Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-17T12:23:42.042Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://github.com/enchant97/note-mark/security/advisories/GHSA-w6m9-39cv-2fwp"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "note-mark",
"vendor": "enchant97",
"versions": [
{
"status": "affected",
"version": "\u003c 0.19.2"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Note Mark is an open-source note-taking application. In versions 0.19.1 and prior, the login endpoint performs bcrypt password verification only when the supplied username exists, returning immediately for nonexistent usernames. This timing discrepancy allows unauthenticated attackers to enumerate valid usernames by measuring response times, enabling targeted credential attacks. This issue has been fixed in version 0.19.2."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 3.7,
"baseSeverity": "LOW",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-208",
"description": "CWE-208: Observable Timing Discrepancy",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-16T23:53:50.195Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/enchant97/note-mark/security/advisories/GHSA-w6m9-39cv-2fwp",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/enchant97/note-mark/security/advisories/GHSA-w6m9-39cv-2fwp"
},
{
"name": "https://github.com/enchant97/note-mark/commit/cf4c6f6acf70b569d80396d323b067c00d45c034",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/enchant97/note-mark/commit/cf4c6f6acf70b569d80396d323b067c00d45c034"
}
],
"source": {
"advisory": "GHSA-w6m9-39cv-2fwp",
"discovery": "UNKNOWN"
},
"title": "Note Mark: Username Enumeration via Login Endpoint Timing Side-Channel"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-40263",
"datePublished": "2026-04-16T23:53:50.195Z",
"dateReserved": "2026-04-10T17:31:45.787Z",
"dateUpdated": "2026-04-17T12:23:42.042Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-40194 (GCVE-0-2026-40194)
Vulnerability from cvelistv5 – Published: 2026-04-10 20:24 – Updated: 2026-05-08 15:18
VLAI
EPSS
VEX
Title
phpseclib has a variable-time HMAC comparison in SSH2::get_binary_packet() using != instead of hash_equals()
Summary
phpseclib is a PHP secure communications library. Starting in 0.1.1 and prior to 3.0.51, 2.0.53, and 1.0.28, phpseclib\Net\SSH2::get_binary_packet() uses PHP's != operator to compare a received SSH packet HMAC against the locally computed HMAC. != on equal-length binary strings in PHP uses memcmp(), which short-circuits on the first differing byte. This is a real variable-time comparison (CWE-208), proven by scaling benchmarks. This vulnerability is fixed in 3.0.51, 2.0.53, and 1.0.28.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-13 15:28 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/phpseclib/phpseclib/security/a… | x_refsource_CONFIRM |
| https://github.com/phpseclib/phpseclib/commit/ffe… | x_refsource_MISC |
| https://github.com/phpseclib/phpseclib/releases/t… | x_refsource_MISC |
| https://github.com/phpseclib/phpseclib/releases/t… | x_refsource_MISC |
| https://github.com/phpseclib/phpseclib/releases/t… | x_refsource_MISC |
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-40194",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-13T15:28:24.152831Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-13T15:35:24.775Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://github.com/phpseclib/phpseclib/security/advisories/GHSA-r854-jrxh-36qx"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "phpseclib",
"vendor": "phpseclib",
"versions": [
{
"status": "affected",
"version": "\u003e= 0.1.1, \u003c 1.0.28"
},
{
"status": "affected",
"version": "\u003e= 2.0.0, \u003c 2.0.53"
},
{
"status": "affected",
"version": "\u003e= 3.0.0, \u003c 3.0.51"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "phpseclib is a PHP secure communications library. Starting in 0.1.1 and prior to 3.0.51, 2.0.53, and 1.0.28, phpseclib\\Net\\SSH2::get_binary_packet() uses PHP\u0027s != operator to compare a received SSH packet HMAC against the locally computed HMAC. != on equal-length binary strings in PHP uses memcmp(), which short-circuits on the first differing byte. This is a real variable-time comparison (CWE-208), proven by scaling benchmarks. This vulnerability is fixed in 3.0.51, 2.0.53, and 1.0.28."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 3.7,
"baseSeverity": "LOW",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-208",
"description": "CWE-208: Observable Timing Discrepancy",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-08T15:18:43.231Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/phpseclib/phpseclib/security/advisories/GHSA-r854-jrxh-36qx",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/phpseclib/phpseclib/security/advisories/GHSA-r854-jrxh-36qx"
},
{
"name": "https://github.com/phpseclib/phpseclib/commit/ffe48b6b1b1af6963327f0a5330e3aa004a194ac",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/phpseclib/phpseclib/commit/ffe48b6b1b1af6963327f0a5330e3aa004a194ac"
},
{
"name": "https://github.com/phpseclib/phpseclib/releases/tag/1.0.28",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/phpseclib/phpseclib/releases/tag/1.0.28"
},
{
"name": "https://github.com/phpseclib/phpseclib/releases/tag/2.0.53",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/phpseclib/phpseclib/releases/tag/2.0.53"
},
{
"name": "https://github.com/phpseclib/phpseclib/releases/tag/3.0.51",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/phpseclib/phpseclib/releases/tag/3.0.51"
}
],
"source": {
"advisory": "GHSA-r854-jrxh-36qx",
"discovery": "UNKNOWN"
},
"title": "phpseclib has a variable-time HMAC comparison in SSH2::get_binary_packet() using != instead of hash_equals()"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-40194",
"datePublished": "2026-04-10T20:24:06.696Z",
"dateReserved": "2026-04-09T20:59:17.620Z",
"dateUpdated": "2026-05-08T15:18:43.231Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
No mitigation information available for this CWE.
CAPEC-462: Cross-Domain Search Timing
An attacker initiates cross domain HTTP / GET requests and times the server responses. The timing of these responses may leak important information on what is happening on the server. Browser's same origin policy prevents the attacker from directly reading the server responses (in the absence of any other weaknesses), but does not prevent the attacker from timing the responses to requests that the attacker issued cross domain.
CAPEC-541: Application Fingerprinting
An adversary engages in fingerprinting activities to determine the type or version of an application installed on a remote target.
CAPEC-580: System Footprinting
An adversary engages in active probing and exploration activities to determine security information about a remote target system. Often times adversaries will rely on remote applications that can be probed for system configurations.