Common Weakness Enumeration
CWE-347
AllowedImproper Verification of Cryptographic Signature
Abstraction: Base · Status: Draft
The product does not verify, or incorrectly verifies, the cryptographic signature for data.
1127 vulnerabilities reference this CWE, most recent first.
CVE-2026-28432 (GCVE-0-2026-28432)
Vulnerability from cvelistv5 – Published: 2026-03-09 21:19 – Updated: 2026-03-10 14:45
VLAI
EPSS
VEX
Title
HTTP signature verification can be bypassed
Summary
Misskey is an open source, federated social media platform. All Misskey servers prior to 2026.3.1 contain a vulnerability that allows bypassing HTTP signature verification. Although this is a vulnerability related to federation, it affects all servers regardless of whether federation is enabled or disabled. This vulnerability is fixed in 2026.3.1.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/misskey-dev/misskey/security/a… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| misskey-dev | misskey |
Affected:
< 2026.3.1
|
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CVE-2026-27962 (GCVE-0-2026-27962)
Vulnerability from cvelistv5 – Published: 2026-03-16 17:34 – Updated: 2026-07-15 01:12
VLAI
EPSS
VEX
Title
Authlib JWS JWK Header Injection: Signature Verification Bypass
Summary
Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a JWK Header Injection vulnerability in authlib's JWS implementation allows an unauthenticated attacker to forge arbitrary JWT tokens that pass signature verification. When key=None is passed to any JWS deserialization function, the library extracts and uses the cryptographic key embedded in the attacker-controlled JWT jwk header field. An attacker can sign a token with their own private key, embed the matching public key in the header, and have the server accept the forged token as cryptographically valid — bypassing authentication and authorization entirely. This issue has been patched in version 1.6.9.
Severity
9.1 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
10 references
| URL | Tags |
|---|---|
| https://github.com/authlib/authlib/security/advis… | x_refsource_CONFIRM |
| https://github.com/authlib/authlib/commit/a5d4b2d… | x_refsource_MISC |
| https://github.com/authlib/authlib/releases/tag/v1.6.9 | x_refsource_MISC |
| https://access.redhat.com/security/cve/CVE-2026-27962 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2448164 | issue-trackingx_refsource_REDHAT |
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| https://access.redhat.com/errata/RHSA-2026:5665 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:7314 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:24853 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:19375 | vendor-advisoryx_refsource_REDHAT |
Impacted products
9 products
| Vendor | Product | Version | |
|---|---|---|---|
| authlib | authlib |
Affected:
< 1.6.9
|
|
| Red Hat | Red Hat Quay 3.10 |
Unaffected:
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(rpm)
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|
| Red Hat | Red Hat Quay 3.14 |
Unaffected:
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|
| Red Hat | Red Hat Quay 3.15 |
Unaffected:
1780891395 , < *
(rpm)
cpe:/a:redhat:quay:3.15::el8 |
|
| Red Hat | Red Hat Quay 3.16 |
Unaffected:
1779204086 , < *
(rpm)
cpe:/a:redhat:quay:3.16::el9 |
|
| Red Hat | Lightspeed Core |
cpe:/a:redhat:lightspeed_core |
|
| Red Hat | Red Hat Ansible Automation Platform 2 |
cpe:/a:redhat:ansible_automation_platform:2 |
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai |
|
| Red Hat | Red Hat Satellite 6 |
cpe:/a:redhat:satellite:6 |
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CVE-2026-27445 (GCVE-0-2026-27445)
Vulnerability from cvelistv5 – Published: 2026-03-04 08:47 – Updated: 2026-03-04 19:26
VLAI
EPSS
VEX
Title
PGP Signature Reflection
Summary
SEPPmail Secure Email Gateway before version 15.0.1 does not properly verify that a PGP signature was generated by the expected key, allowing signature spoofing.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://downloads.seppmail.com/extrelnotes/150/ER… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SEPPmail | Secure Email Gateway |
Affected:
0 , < 15.0.1
(custom)
|
Credits
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CVE-2026-25922 (GCVE-0-2026-25922)
Vulnerability from cvelistv5 – Published: 2026-02-12 19:38 – Updated: 2026-02-17 16:19
VLAI
EPSS
VEX
Title
authentik has a Signature Verification Bypass via SAML Assertion Wrapping
Summary
authentik is an open-source identity provider. Prior to 2025.8.6, 2025.10.4, and 2025.12.4, when using a SAML Source that has the option Verify Assertion Signature under Verification Certificate enabled and not Verify Response Signature, or does not have the Encryption Certificate setting under Advanced Protocol settings configured, it was possible for an attacker to inject a malicious assertion before the signed assertion that authentik would use instead. authentik 2025.8.6, 2025.10.4, and 2025.12.4 fix this issue.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/goauthentik/authentik/security… | x_refsource_CONFIRM |
| https://github.com/goauthentik/authentik/releases… | x_refsource_MISC |
| https://github.com/goauthentik/authentik/releases… | x_refsource_MISC |
| https://github.com/goauthentik/authentik/releases… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| goauthentik | authentik |
Affected:
< 2025.8.6
Affected: >= 2025.10.0-rc1, < 2025.10.4 Affected: >= 2025.10.0-rc1, < 2025.12.4 |
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CVE-2026-25793 (GCVE-0-2026-25793)
Vulnerability from cvelistv5 – Published: 2026-02-06 22:55 – Updated: 2026-02-09 15:25
VLAI
EPSS
VEX
Title
Nebula Has Possible Blocklist Bypass via ECDSA Signature Malleability
Summary
Nebula is a scalable overlay networking tool. In versions from 1.7.0 to 1.10.2, when using P256 certificates (which is not the default configuration), it is possible to evade a blocklist entry created against the fingerprint of a certificate by using ECDSA Signature Malleability to use a copy of the certificate with a different fingerprint. This issue has been patched in version 1.10.3.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/slackhq/nebula/security/adviso… | x_refsource_CONFIRM |
| https://github.com/slackhq/nebula/commit/f573e8a2… | x_refsource_MISC |
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CVE-2026-24850 (GCVE-0-2026-24850)
Vulnerability from cvelistv5 – Published: 2026-01-28 00:24 – Updated: 2026-01-28 14:54
VLAI
EPSS
VEX
Title
ML-DSA Signature Verification Accepts Signatures with Repeated Hint Indices
Summary
The ML-DSA crate is a Rust implementation of the Module-Lattice-Based Digital Signature Standard (ML-DSA). Starting in version 0.0.4 and prior to version 0.1.0-rc.4, the ML-DSA signature verification implementation in the RustCrypto `ml-dsa` crate incorrectly accepts signatures with repeated (duplicate) hint indices. According to the ML-DSA specification (FIPS 204 / RFC 9881), hint indices within each polynomial must be **strictly increasing**. The current implementation uses a non-strict monotonic check (`<=` instead of `<`), allowing duplicate indices. This is a regression bug. The original implementation was correct, but a commit in version 0.0.4 inadvertently changed the strict `<` comparison to `<=`, introducing the vulnerability. Version 0.1.0-rc.4 fixes the issue.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
11 references
| URL | Tags |
|---|---|
| https://github.com/RustCrypto/signatures/security… | x_refsource_CONFIRM |
| https://github.com/RustCrypto/signatures/issues/894 | x_refsource_MISC |
| https://github.com/RustCrypto/signatures/pull/895 | x_refsource_MISC |
| https://github.com/RustCrypto/signatures/commit/4… | x_refsource_MISC |
| https://github.com/RustCrypto/signatures/commit/b… | x_refsource_MISC |
| https://csrc.nist.gov/pubs/fips/204/final | x_refsource_MISC |
| https://datatracker.ietf.org/doc/html/rfc9881 | x_refsource_MISC |
| https://github.com/C2SP/wycheproof | x_refsource_MISC |
| https://github.com/C2SP/wycheproof/blob/master/te… | x_refsource_MISC |
| https://github.com/C2SP/wycheproof/blob/master/te… | x_refsource_MISC |
| https://github.com/C2SP/wycheproof/blob/master/te… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| RustCrypto | signatures |
Affected:
>= 0.0.4, < 0.1.0-rc.4
|
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CVE-2026-24807 (GCVE-0-2026-24807)
Vulnerability from cvelistv5 – Published: 2026-01-27 08:43 – Updated: 2026-05-06 16:58
VLAI
EPSS
VEX
Title
Buffer Overflow Vulnerability in liuyueyi/quick-media
Summary
Improper Verification of Cryptographic Signature vulnerability in liuyueyi quick-media (plugins/svg-plugin/batik-codec-fix/src/main/java/org/apache/batik/ext/awt/image/codec/util modules). This vulnerability is associated with program files SeekableOutputStream.Java.
This issue affects quick-media: before v1.0.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| liuyueyi | quick-media |
Affected:
0 , < v1.0
(git)
|
Credits
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CVE-2026-24032 (GCVE-0-2026-24032)
Vulnerability from cvelistv5 – Published: 2026-04-14 08:40 – Updated: 2026-04-14 13:18
VLAI
EPSS
VEX
Summary
A vulnerability has been identified in SINEC NMS (All versions < V4.0 SP3 with UMC). The affected application contains an authentication weakness due to insufficient validation of user identity in the UMC component.
This could allow an unauthenticated remote attacker to bypass authentication and gain unauthorized access to the application. (ZDI-CAN-27564)
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
1 reference
Impacted products
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CVE-2026-23992 (GCVE-0-2026-23992)
Vulnerability from cvelistv5 – Published: 2026-01-22 02:20 – Updated: 2026-01-22 15:21
VLAI
EPSS
VEX
Title
go-tuf improperly validates the configured threshold for delegations
Summary
go-tuf is a Go implementation of The Update Framework (TUF). Starting in version 2.0.0 and prior to version 2.3.1, a compromised or misconfigured TUF repository can have the configured value of signature thresholds set to 0, which effectively disables signature verification. This can lead to unauthorized modification to TUF metadata files is possible at rest, or during transit as no integrity checks are made. Version 2.3.1 fixes the issue. As a workaround, always make sure that the TUF metadata roles are configured with a threshold of at least 1.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/theupdateframework/go-tuf/secu… | x_refsource_CONFIRM |
| https://github.com/theupdateframework/go-tuf/comm… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| theupdateframework | go-tuf |
Affected:
>= 2.0.0, < 2.3.1
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CVE-2026-23967 (GCVE-0-2026-23967)
Vulnerability from cvelistv5 – Published: 2026-01-22 01:59 – Updated: 2026-01-22 16:03
VLAI
EPSS
VEX
Title
sm-crypto Affected by Signature Malleability in SM2-DSA
Summary
sm-crypto provides JavaScript implementations of the Chinese cryptographic algorithms SM2, SM3, and SM4. A signature malleability vulnerability exists in the SM2 signature verification logic of the sm-crypto library prior to version 0.3.14. An attacker can derive a new valid signature for a previously signed message from an existing signature. Version 0.3.14 patches the issue.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/JuneAndGreen/sm-crypto/securit… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| JuneAndGreen | sm-crypto |
Affected:
< 0.3.14
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"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-347",
"description": "CWE-347: Improper Verification of Cryptographic Signature",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-01-22T01:59:30.555Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/JuneAndGreen/sm-crypto/security/advisories/GHSA-qv7w-v773-3xqm",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/JuneAndGreen/sm-crypto/security/advisories/GHSA-qv7w-v773-3xqm"
}
],
"source": {
"advisory": "GHSA-qv7w-v773-3xqm",
"discovery": "UNKNOWN"
},
"title": "sm-crypto Affected by Signature Malleability in SM2-DSA"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-23967",
"datePublished": "2026-01-22T01:59:30.555Z",
"dateReserved": "2026-01-19T14:49:06.314Z",
"dateUpdated": "2026-01-22T16:03:58.987Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
No mitigation information available for this CWE.
CAPEC-463: Padding Oracle Crypto Attack
An adversary is able to efficiently decrypt data without knowing the decryption key if a target system leaks data on whether or not a padding error happened while decrypting the ciphertext. A target system that leaks this type of information becomes the padding oracle and an adversary is able to make use of that oracle to efficiently decrypt data without knowing the decryption key by issuing on average 128*b calls to the padding oracle (where b is the number of bytes in the ciphertext block). In addition to performing decryption, an adversary is also able to produce valid ciphertexts (i.e., perform encryption) by using the padding oracle, all without knowing the encryption key.
CAPEC-475: Signature Spoofing by Improper Validation
An adversary exploits a cryptographic weakness in the signature verification algorithm implementation to generate a valid signature without knowing the key.