A flaw was found in EAP's undertow http/1.1 chunked-transfer decoder. (CVE-2026-15561)
A flaw was found in EAP's undertow http/1.1 chunked-transfer decoder. missing limits on size and count would allow an attacker to use an unauthenticated connection to drive the JVM to an OutOfMemory error, stopping all deployments on the listener, and achieving Denial of Service.
AI Analysis
Technical Summary
CVE-2026-15561 is a denial of service vulnerability in the Undertow HTTP/1.1 chunked-transfer decoder used by Red Hat JBoss Enterprise Application Platform 7. The flaw arises from missing limits on the size and count of chunked transfer data, allowing an unauthenticated attacker to consume excessive JVM memory, leading to an OutOfMemory error. This results in the stoppage of all deployments on the affected listener. The vulnerability is tracked under CWE-770 (Allocation of Resources Without Limits or Throttling) and has a CVSS v3.1 base score of 7.5 (high severity) with network attack vector, low complexity, no privileges required, and no user interaction needed. Red Hat has released a security update for JBoss Enterprise Application Platform 7.4.25 that addresses this issue.
Potential Impact
An attacker can exploit this vulnerability remotely without authentication to cause an OutOfMemory error in the JVM hosting the Undertow HTTP listener. This leads to denial of service by stopping all deployments on the listener, impacting availability. There is no confidentiality or integrity impact reported.
Mitigation Recommendations
A security update is available from Red Hat for JBoss Enterprise Application Platform 7.4.25 that fixes this vulnerability. Users should apply this official patch to remediate the issue. Prior to updating, ensure all previous errata are applied and back up existing installations. No additional mitigations are specified by the vendor advisory.
A flaw was found in EAP's undertow http/1.1 chunked-transfer decoder. (CVE-2026-15561)
Description
A flaw was found in EAP's undertow http/1.1 chunked-transfer decoder. missing limits on size and count would allow an attacker to use an unauthenticated connection to drive the JVM to an OutOfMemory error, stopping all deployments on the listener, and achieving Denial of Service.
CVSS v3.1
Score 7.5high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-15561 is a denial of service vulnerability in the Undertow HTTP/1.1 chunked-transfer decoder used by Red Hat JBoss Enterprise Application Platform 7. The flaw arises from missing limits on the size and count of chunked transfer data, allowing an unauthenticated attacker to consume excessive JVM memory, leading to an OutOfMemory error. This results in the stoppage of all deployments on the affected listener. The vulnerability is tracked under CWE-770 (Allocation of Resources Without Limits or Throttling) and has a CVSS v3.1 base score of 7.5 (high severity) with network attack vector, low complexity, no privileges required, and no user interaction needed. Red Hat has released a security update for JBoss Enterprise Application Platform 7.4.25 that addresses this issue.
Potential Impact
An attacker can exploit this vulnerability remotely without authentication to cause an OutOfMemory error in the JVM hosting the Undertow HTTP listener. This leads to denial of service by stopping all deployments on the listener, impacting availability. There is no confidentiality or integrity impact reported.
Mitigation Recommendations
A security update is available from Red Hat for JBoss Enterprise Application Platform 7.4.25 that fixes this vulnerability. Users should apply this official patch to remediate the issue. Prior to updating, ensure all previous errata are applied and back up existing installations. No additional mitigations are specified by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-fhmg-q5fc-2m8v
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-15561"]
- Ecosystems
- []
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Patch Information
Threat ID: 6a7c9b72bf8831d539ce081d
Added to database: 08/12/2026, 16:12:34 UTC
Last enriched: 08/12/2026, 17:29:36 UTC
Last updated: 08/13/2026, 02:40:59 UTC
Views: 3
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