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.
Published: 2026-07-29
Score: 8.2 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

Apache Traffic Server copies the client Host header into a fixed‑size stack buffer without a bound during redirect handling. An overly long Host header overflows the stack, producing a stack buffer overflow that can corrupt stack contents and, in the worst case, allow arbitrary code execution or cause a server crash.

Affected Systems

The vulnerability affects Apache Traffic Server from the Apache Software Foundation. Vulnerable releases include 8.0.0 through 8.1.9, 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. The EPSS score is less than 1 %, suggesting a low probability of exploitation at the time of this analysis. The vulnerability is not listed in the CISA KEV catalog. The likely attack vector is a remote HTTP client that can send an overly long Host header to a server with redirect following enabled; this inference is based on the description.

Generated by OpenCVE AI on August 4, 2026 at 23:16 UTC.

Remediation

No vendor fix or workaround currently provided.

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.
  • Validate or enforce an appropriate maximum length on incoming Host headers to prevent overflow attempts.

Generated by OpenCVE AI on August 4, 2026 at 23:16 UTC.

Tracking

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Advisories

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History

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: 2026-07-29T13:11:14.140Z

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 : Analyzed

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

Modified: 2026-08-03T13:42:43.303

Link: CVE-2026-33930

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-04T23:30:15Z

Weaknesses
  • CWE-121

    Stack-based Buffer Overflow