CVE-2026-33930 Details
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 8.1.9, 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.
A buffer overflow vulnerability has been identified in Apache Traffic Server. When redirect following is enabled, the server copies the client Host header into a fixed-size stack buffer without proper length validation. This flaw allows an overly long Host header to overflow the stack. The vulnerability affects Apache Traffic Server versions 8.0.0 through 8.1.9, 9.0.0 through 9.2.14, and 10.0.0 through 10.1.3.
Users are advised to upgrade to Apache Traffic Server versions 9.2.15 or 10.1.4.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 29, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d | [email protected] | Vendor AdvisoryMailing List |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-121 | Stack-based Buffer Overflow | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| apache traffic server | >= 8.0.0, <= 8.1.9 >= 9.0.0, < 9.2.15 >= 10.0.0, < 10.1.4 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 3, 2026 | Initial Analysis | [email protected] |
| Jul 29, 2026 | CVE Modified | CISA-ADP |
| Jul 29, 2026 | New CVE Received | [email protected] |