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.
Published: 2026-07-29
Score: 8.2 High
EPSS: < 1% Very Low
KEV: No
Impact: Stack Buffer Overflow
Action: Immediate Patch
AI Analysis

Impact

Apache Traffic Server copies an unbounded Host header into a stack buffer during redirect handling. A Host header longer than the buffer size results in a stack overflow, which may corrupt control data or crash the server. The CVE description does not state that arbitrary code execution is guaranteed, only that stack corruption can occur.

Affected Systems

The vulnerability affects Apache Traffic Server from the Apache Software Foundation. Vulnerable releases include 8.0.0 through 8.1.11, 9.0.0 through 9.2.14, and 10.0.0 through 10.1.3.

Risk and Exploitability

The CVSS score of 8.2 indicates high severity, while the EPSS score of less than 1 % suggests a low likelihood of exploitation at the time of analysis. The vulnerability is not listed in the CISA KEV catalog. The likely attack vector is a remote HTTP client that can send an over‑long Host header to a server with redirect following enabled; this inference is based on the description.

Generated by OpenCVE AI on October 1, 2026 at 23:56 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade Apache Traffic Server to version 9.2.15 or 10.1.4, which contain the fix for the buffer overflow.
  • If upgrade is not possible, disable redirect following in the Traffic Server configuration to avoid the vulnerable code path.
  • Modify the configuration or code to enforce an appropriate maximum length on incoming Host headers, ensuring bounds checking in compliance with CWE-121.

Generated by OpenCVE AI on October 1, 2026 at 23:56 UTC.

Tracking

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Advisories

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History

Thu, 01 Oct 2026 17:00:00 +0000

Type Values Removed Values Added
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. 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.

Wed, 29 Jul 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 29 Jul 2026 11:45:00 +0000

Type Values Removed Values Added
First Time appeared Apache
Apache traffic Server
Vendors & Products Apache
Apache traffic Server

Wed, 29 Jul 2026 07:45:00 +0000

Type Values Removed Values Added
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.
Title Apache Traffic Server: Buffer overflow via Host field that has a long string value
Weaknesses CWE-121
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Subscriptions

Apache Traffic Server
cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2026-10-01T16:57:26.531Z

Reserved: 2026-03-24T18:30:58.396Z

Link: CVE-2026-33930

cve-icon Vulnrichment

Updated: 2026-07-29T13:10:56.363Z

cve-icon NVD

Status : Modified

Published: 2026-07-29T08:16:31.127

Modified: 2026-10-01T17:17:23.520

Link: CVE-2026-33930

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-02T00:00:15Z

Weaknesses
  • CWE-121

    Stack-based Buffer Overflow