CVE-2026-65100
Received
Received - Intake
HTTP/2 HPACK Header Block Corruption in Apache Traffic Server
Vulnerability report for CVE-2026-65100, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-07-29
Last updated on: 2026-07-29
Assigner: Apache Software Foundation
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| apache | traffic_server | From 8.0.0 (inc) to 8.1.9 (inc) |
| apache | traffic_server | From 9.0.0 (inc) to 9.2.14 (inc) |
| apache | traffic_server | From 10.0.0 (inc) to 10.1.3 (inc) |
| apache | traffic_server | 9.2.15 |
| apache | traffic_server | 10.1.4 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-696 | The product performs multiple related behaviors, but the behaviors are performed in the wrong order in ways that may produce resultant weaknesses. |
