Critical [CVE-2026-111816] Apache Traffic Server forwarded a malformed 302 response that should have been rejected as a parse error, because the Transfer-Encoding: chunked carve-out bypassed the rejection path
This critical-severity Apache Software Foundation advisory covers CVE-2026-111816 affecting Apache Traffic Server.
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Summary
Apache Traffic Server forwarded a malformed 302 response that should have been rejected as a parse error, because the Transfer-Encoding: chunked carve-out bypassed the rejection path. A response that two peers can read differently is then stored and served, allowing cache poisoning and response-framing desync.
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.
- 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
- 9.2.16
- 10.1.5
- 10.2.1
Official advisory · high-confidence parse· fetched 12 hours ago·verify at source
Mitigation checklist
- 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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