CVE-2026-65100 – Apache Traffic Server: HPACK encoder desynchronizes from the decoder after a failed header encode

CVE ID :CVE-2026-65100

Published : July 29, 2026, 10:16 a.m. | 24 minutes ago

Description :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.

Severity: 6.3 | MEDIUM

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