CVE-2026-65100
Apache Traffic Server: HPACK encoder desynchronizes from the decoder after a failed header encode
CVSS Score
4.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-696 |
| Vendor | apache software foundation |
| Product | apache traffic server |
| Published | Jul 29, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low
Affected Versions
Apache Software Foundation / Apache Traffic Server
8.0.0 ≤ 8.1.9 9.0.0 ≤ 9.2.14 10.0.0 ≤ 10.1.3
References
Credits
🔍 Omkhar Arasaratnam 🔍 Apache Community