CVE-2026-65100: Apache Traffic Server

Medium severity, CVSS 4.8. EPSS: 0.6% chance of exploitation in the next 30 days.

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 8.1.11, 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.

Affected products

• Apache Traffic Server: from 8.0.0, up to and including 8.1.9; from 9.0.0, before 9.2.15 (fixed in 9.2.15); from 10.0.0, before 10.1.4 (fixed in 10.1.4)

Published 2026-07-29. Last modified 2026-10-01.