Medium [CVE-2026-111817] Apache Traffic Server can stall a chunked transfer that it passes through with its trailers removed (proxy.config.http.drop_chunked_trailers) until the connection times out, because it waits for the trailer bytes it has already dropped
This medium-severity Apache Software Foundation advisory covers CVE-2026-111817 affecting Apache Traffic Server.
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Summary
Apache Traffic Server can stall a chunked transfer that it passes through with its trailers removed (proxy.config.http.drop_chunked_trailers) until the connection times out, because it waits for the trailer bytes it has already dropped. Trailer dropping is on by default in 10.x.
In 8.1.11 and 9.2.x it is off by default, and those versions are affected only if it is enabled.
This issue affects Apache Traffic Server: 8.1.11, from 9.2.5 through 9.2.15, from 10.0.0 through 10.1.4, 10.2.0.
Users are recommended to upgrade to version 10.1.5 or 10.2.1, which fix the issue.
- 9.2.5 through 9.2.15
- 10.0.0 through 10.1.4
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
- 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 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-2026-111812Oct 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-2026-111809Oct 21, 2026Apache Traffic Server allows request smuggling via HEAD requests that carry Content-Length
- 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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