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.
Metrics
Affected Vendors & Products
References
History
Fri, 23 Oct 2026 12:30:00 +0000
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ssvc
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Thu, 22 Oct 2026 00:00:00 +0000
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| First Time appeared |
Apache
Apache apache Traffic Server Apache traffic Server Apache Software Foundation Apache Software Foundation apache Traffic Server |
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Apache
Apache apache Traffic Server Apache traffic Server Apache Software Foundation Apache Software Foundation apache Traffic Server |
Wed, 21 Oct 2026 18:30:00 +0000
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| Description | 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. | |
| Title | Apache Traffic Server: Origin connection still owed a request body is reused, enabling request smuggling | |
| Weaknesses | CWE-444 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: apache
Published: 2026-10-21T18:22:28.383Z
Updated: 2026-10-23T11:06:22.325Z
Reserved: 2025-04-01T00:04:31.777Z
Link: CVE-2025-31699
Updated: 2026-10-23T11:00:46.206Z
Status : Awaiting Analysis
Published: 2026-10-21T19:16:47.390
Modified: 2026-10-23T12:18:04.473
Link: CVE-2025-31699
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