Medium [CVE-2026-65100] Apache Traffic Server updates the HTTP/2 HPACK dynamic table before confirming the header block encoded successfully, so an encode failure leaves the encoder out of sync with the peer decoder and corrupts subsequent header blocks on the connection
This medium-severity Apache Software Foundation advisory covers CVE-2026-65100 affecting Apache Traffic Server.
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Summary
Apache Traffic Server updates the HTTP/2 HPACK dynamic table before confirming the header block encoded successfully, so an encode failure leaves the encoder out of sync with the peer decoder and corrupts subsequent header blocks on the connection.
This issue affects Apache Traffic Server: from 8.0.0 through 8.1.9, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3.
Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue.
- 8.0.0 through 8.1.9
- 9.0.0 through 9.2.14
- 10.0.0 through 10.1.3.
- through 10.1.3
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- 9.2.15
- 10.1.4
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue.
- Apache Traffic Server updates the HTTP/2 HPACK dynamic table before confirming the header block encoded successfully, so an encode failure leaves the encoder out of sync with the peer decoder and corrupts subsequent header blocks on the connection.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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