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Advisory severityCritical9.1Apache Software Foundation Updated

Critical [CVE-2025-31699] Apache Traffic Server can return an origin connection to the shared pool while the origin is still waiting on a request body the client declared but never fully sent, including when the client used Expect: 100-continue

This critical-severity Apache Software Foundation advisory covers CVE-2025-31699 affecting Apache Traffic Server.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2025-31699 Source published Source updated

VulniPulse record published Record updated

CVE-2025-31699
Affected products & platforms
Apache Software FoundationInfra & Gateways
Open source advisory

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Summary

Apache Traffic Server can return an origin connection to the shared pool while the origin is still waiting on a request body the client declared but never fully sent, including when the client used Expect: 100-continue.

The origin then reads a later request on that connection as leftover body data, which lets an attacker smuggle requests past ATS access controls, disrupt other users' requests, or poison the cache.

This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.15, from 10.0.0 through 10.1.4, 10.2.0.

Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.

Affected versions
  • 8.0.0 through 8.1.11
  • 9.0.0 through 9.2.15
  • 10.0.0 through 10.1.4

Official advisory · high-confidence parse· fetched 12 hours ago·verify at source

Fixed versions
  • 9.2.16
  • 10.1.5
  • 10.2.1

Official advisory · high-confidence parse· fetched 12 hours ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.

Official advisory · high-confidence parse· fetched 12 hours ago·verify at source

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