What is CVE-2026-33930?

CVE-2026-33930 is a medium-severity vulnerability in Apache Software Foundation Traffic Server, classified under Stack-based Buffer Overflow. CVSS score: 5.9/10. Published 2026-07-29.

How severe is CVE-2026-33930?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Buffer overflow in Apache Software Foundation Traffic Server

CVE-2026-33930

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 Tra…

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Apache Software Foundation Traffic Server — versions 8.0.0, 9.0.0, 10.0.0

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

security@apache.org (vendor-advisory)

Frequently asked questions

What is CVE-2026-33930?: CVE-2026-33930 is a medium-severity vulnerability in Apache Software Foundation Traffic Server, classified under Stack-based Buffer Overflow. CVSS score: 5.9/10. Published 2026-07-29.
How severe is CVE-2026-33930?: Medium severity. CVSS v3 base score is 5.9 out of 10.