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CVE-2026-65100

Apache Traffic Server: HPACK encoder desynchronizes from the decoder after a failed header encode

Published: Jul 29, 2026Updated: Aug 3, 2026 Sources: CVE List NVDCWE-696
4.8MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 83.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:NI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:LAvailability
Low
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Weaknesses

CWE-696

Affected Products

apache
oss-project·USaka apache http server, apache httpd
traffic serverOn-premWeb App
Web & CMS Plugins
Apache Software Foundation
oss-project·USaka apache foundation
Apache Traffic ServerOn-premNetwork Device
Networking Infrastructure / load-balancer-proxy

Exploitability

Official Patch Available
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References

https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d
lists.apache.org

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