CVE-2026-76288 (GCVE-0-2026-76288)
Vulnerability from cvelistv5 – Published: 2026-10-21 22:51 – Updated: 2026-10-22 13:37
VLAI
EPSS
VEX
Title
Denial of Service (DoS) through Splunk Web Content-Type Header Parsing in Splunk Enterprise
Summary
In Splunk Enterprise versions below 10.4.4, 10.2.8, 10.0.11, and 9.4.16, an unauthenticated user could send a single crafted request to the Splunk Web JavaScript logger endpoint and cause Splunk Web to stop responding to requests. Splunk Web remains unavailable until Splunk Enterprise is restarted.
The vulnerability is possible because Splunk Web does not limit request-header parsing before processing the request.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-22 13:20 UTC
CWE
- CWE-400 - The software does not properly control the allocation and maintenance of a limited resource thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Splunk | Splunk Enterprise |
Affected:
10.4 , < 10.4.4
(custom)
Affected: 10.2 , < 10.2.8 (custom) Affected: 10.0 , < 10.0.11 (custom) Affected: 9.4 , < 9.4.16 (custom) |
guessed |
Date Public
2026-10-21 00:00
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-76288",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-22T13:20:16.974939Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-10-22T13:37:48.847Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"modules": [
"Splunk Web"
],
"product": "Splunk Enterprise",
"vendor": "Splunk",
"versions": [
{
"lessThan": "10.4.4",
"status": "affected",
"version": "10.4",
"versionType": "custom"
},
{
"lessThan": "10.2.8",
"status": "affected",
"version": "10.2",
"versionType": "custom"
},
{
"lessThan": "10.0.11",
"status": "affected",
"version": "10.0",
"versionType": "custom"
},
{
"lessThan": "9.4.16",
"status": "affected",
"version": "9.4",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "Pedro Cardoso (tvmpt)"
}
],
"datePublic": "2026-10-21T00:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "In Splunk Enterprise versions below 10.4.4, 10.2.8, 10.0.11, and 9.4.16, an unauthenticated user could send a single crafted request to the Splunk Web JavaScript logger endpoint and cause Splunk Web to stop responding to requests. Splunk Web remains unavailable until Splunk Enterprise is restarted.\nThe vulnerability is possible because Splunk Web does not limit request-header parsing before processing the request."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-400",
"description": "The software does not properly control the allocation and maintenance of a limited resource thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.",
"lang": "en",
"type": "cwe"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-21T22:51:50.487Z",
"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"shortName": "cisco"
},
"references": [
{
"url": "https://advisory.splunk.com/advisories/SVD-2026-1007"
}
],
"solutions": [
{
"lang": "en",
"value": "Upgrade Splunk Enterprise to versions 10.4.4, 10.2.8, 10.0.11, and 9.4.16 or higher."
}
],
"source": {
"advisory": "SVD-2026-1007",
"discovery": ""
},
"title": "Denial of Service (DoS) through Splunk Web Content-Type Header Parsing in Splunk Enterprise",
"workarounds": [
{
"lang": "en",
"value": "The vulnerability affects instances with Splunk Web turned on. Turning Splunk Web off is a possible workaround.\nSee [Disable unnecessary Splunk Enterprise components](https://help.splunk.com/en/splunk-enterprise/administer/manage-users-and-security/10.4/install-splunk-enterprise-securely/disable-unnecessary-splunk-enterprise-components) and the [web.conf](https://help.splunk.com/en/splunk-enterprise/administer/admin-manual/10.4/configuration-file-reference/10.4.1-configuration-file-reference/web.conf) configuration specification file for more information on turning off Splunk Web."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"assignerShortName": "cisco",
"cveId": "CVE-2026-76288",
"datePublished": "2026-10-21T22:51:50.487Z",
"dateReserved": "2026-08-19T12:02:03.622Z",
"dateUpdated": "2026-10-22T13:37:48.847Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-76288",
"date": "2026-10-22",
"epss": "0.00372",
"percentile": "0.29931"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"modules": [
"Splunk Web"
],
"product": "Splunk Enterprise",
"vendor": "Splunk",
"versions": [
{
"lessThan": "10.4.4",
"status": "affected",
"version": "10.4",
"versionType": "custom"
},
{
"lessThan": "10.2.8",
"status": "affected",
"version": "10.2",
"versionType": "custom"
},
{
"lessThan": "10.0.11",
"status": "affected",
"version": "10.0",
"versionType": "custom"
},
{
"lessThan": "9.4.16",
"status": "affected",
"version": "9.4",
"versionType": "custom"
}
]
}
],
"source": "psirt@cisco.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In Splunk Enterprise versions below 10.4.4, 10.2.8, 10.0.11, and 9.4.16, an unauthenticated user could send a single crafted request to the Splunk Web JavaScript logger endpoint and cause Splunk Web to stop responding to requests. Splunk Web remains unavailable until Splunk Enterprise is restarted.\nThe vulnerability is possible because Splunk Web does not limit request-header parsing before processing the request."
}
],
"id": "CVE-2026-76288",
"lastModified": "2026-10-22T16:57:10.180",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "psirt@cisco.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-76288",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-22T13:20:16.974939Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-10-21T23:17:26.537",
"references": [
{
"source": "psirt@cisco.com",
"url": "https://advisory.splunk.com/advisories/SVD-2026-1007"
}
],
"sourceIdentifier": "psirt@cisco.com",
"vulnStatus": "Awaiting Analysis",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-400"
}
],
"source": "psirt@cisco.com",
"type": "Secondary"
}
]
}
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-76288",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-22T13:20:16.974939Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-10-22T13:34:12.166Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"modules": [
"Splunk Web"
],
"product": "Splunk Enterprise",
"vendor": "Splunk",
"versions": [
{
"lessThan": "10.4.4",
"status": "affected",
"version": "10.4",
"versionType": "custom"
},
{
"lessThan": "10.2.8",
"status": "affected",
"version": "10.2",
"versionType": "custom"
},
{
"lessThan": "10.0.11",
"status": "affected",
"version": "10.0",
"versionType": "custom"
},
{
"lessThan": "9.4.16",
"status": "affected",
"version": "9.4",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "Pedro Cardoso (tvmpt)"
}
],
"datePublic": "2026-10-21T00:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "In Splunk Enterprise versions below 10.4.4, 10.2.8, 10.0.11, and 9.4.16, an unauthenticated user could send a single crafted request to the Splunk Web JavaScript logger endpoint and cause Splunk Web to stop responding to requests. Splunk Web remains unavailable until Splunk Enterprise is restarted.\nThe vulnerability is possible because Splunk Web does not limit request-header parsing before processing the request."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-400",
"description": "The software does not properly control the allocation and maintenance of a limited resource thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.",
"lang": "en",
"type": "cwe"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-21T22:51:50.487Z",
"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"shortName": "cisco"
},
"references": [
{
"url": "https://advisory.splunk.com/advisories/SVD-2026-1007"
}
],
"solutions": [
{
"lang": "en",
"value": "Upgrade Splunk Enterprise to versions 10.4.4, 10.2.8, 10.0.11, and 9.4.16 or higher."
}
],
"source": {
"advisory": "SVD-2026-1007",
"discovery": ""
},
"title": "Denial of Service (DoS) through Splunk Web Content-Type Header Parsing in Splunk Enterprise",
"workarounds": [
{
"lang": "en",
"value": "The vulnerability affects instances with Splunk Web turned on. Turning Splunk Web off is a possible workaround.\nSee [Disable unnecessary Splunk Enterprise components](https://help.splunk.com/en/splunk-enterprise/administer/manage-users-and-security/10.4/install-splunk-enterprise-securely/disable-unnecessary-splunk-enterprise-components) and the [web.conf](https://help.splunk.com/en/splunk-enterprise/administer/admin-manual/10.4/configuration-file-reference/10.4.1-configuration-file-reference/web.conf) configuration specification file for more information on turning off Splunk Web."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"assignerShortName": "cisco",
"cveId": "CVE-2026-76288",
"datePublished": "2026-10-21T22:51:50.487Z",
"dateReserved": "2026-08-19T12:02:03.622Z",
"dateUpdated": "2026-10-21T22:51:50.487Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
Loading timeline…
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.