CVE-2023-39456: Apache Traffic Server: Malformed http/2 frames can cause an abort

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 58.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-10-17 · updated 2026-06-17
Weakness: CWE-20

Description

Improper Input Validation vulnerability in Apache Traffic Server with malformed HTTP/2 frames.This issue affects Apache Traffic Server: from 9.0.0 through 9.2.2. Users are recommended to upgrade to version 9.2.3, which fixes the issue.

Affected products

Apache Software Foundation Apache Traffic Server: from 9.0.0 before 9.2.3 — fixed in 9.2.3
Fedoraproject Fedora: 37, 38

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Traffic Server 9.2.3. Check the vendor advisory for mitigations.

References

https://lists.apache.org/thread/5py8h42mxfsn8l1wy6o41xwhsjlsd87q
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JIZSEFC3YKCGABA2BZW6ZJRMDZJMB7PJ/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VHUHTSXLXGXS7JYKBXTA3VINUPHTNGVU/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZKQSIKIAT5TJ3WSLU3RDBQ35YX4GY4V3/
https://www.debian.org/security/2023/dsa-5549
https://lists.apache.org/thread/5py8h42mxfsn8l1wy6o41xwhsjlsd87q
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JIZSEFC3YKCGABA2BZW6ZJRMDZJMB7PJ/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VHUHTSXLXGXS7JYKBXTA3VINUPHTNGVU/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZKQSIKIAT5TJ3WSLU3RDBQ35YX4GY4V3/
https://www.debian.org/security/2023/dsa-5549

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