Medium [CVE-2026-111809] Apache Traffic Server allows request smuggling via HEAD requests that carry Content-Length or Transfer-Encoding
This medium-severity Apache Software Foundation advisory covers CVE-2026-111809 affecting Apache Traffic Server.
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Summary
Apache Traffic Server allows request smuggling via HEAD requests that carry Content-Length or Transfer-Encoding.
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 7 days ago·verify at source
- 9.2.16
- 10.1.5
- 10.2.1
Official advisory · high-confidence parse· fetched 7 days 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 7 days ago·verify at source
More Apache Software Foundation advisories
- CVE-2026-112381Oct 21, 2026Apache Traffic Server can crash with a null pointer dereference when a client POST request
- CVE-2026-111817Oct 21, 2026Apache Traffic Server can stall a chunked transfer that it passes through with its
- CVE-2026-111812Oct 21, 2026Apache Traffic Server's origin_server_auth plugin lets a client force signing
- CVE-2026-111811Oct 21, 2026Apache Traffic Server's experimental tsmemcache plugin allows unauthenticated network
- CVE-2026-111810Oct 21, 2026Apache Traffic Server 9.2.15, 10.1.4 and 10.2.0 write one unthrottled diagnostic log line
- CVE-2026-111815Oct 21, 2026Apache Traffic Server can resume a TLS session across SNI virtual hosts
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