Vulnerability · Published Jul 29, 2026 · Assigned by apache

CVE-2026-33930Apache Traffic Server: Buffer overflow via Host field that has a long string value

Medium 5.9

In plain English

A medium-severity stack buffer overflow in Apache Traffic Server from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities).

Severity (CVSS 3.1)5.9Medium

Exploit odds (30 days)0.6%top 51.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Apache Traffic Server copies the client Host header into a fixed-size stack buffer without a bound during redirect handling, so an over-long Host header overflows the stack when redirect following is enabled. 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	trafficserver	no fix listed	DEBIAN-CVE-2026-33930
Ubuntu:24.04:LTS	trafficserver	no fix listed	UBUNTU-CVE-2026-33930

Affected products (as reported)

Vendor	Product	Versions
Apache Software Foundation	Apache Traffic Server	8.0.0 – through 8.1.119.0.0 – through 9.2.1410.0.0 – through 10.1.3

Weakness: CWE-121 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References

https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d vendor-advisory