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CVE-2026-57834 – HTTP Request Smuggling – Apache Traffic Server 8.0.0–10.1.3

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Summary

CVE-2026-57834 is a critical HTTP request smuggling vulnerability in Apache Traffic Server (ATS) caused by improper handling of malformed chunked message bodies (CWE-444: Inconsistent Interpretation of HTTP Requests). It affects ATS versions 8.0.0 through 10.1.3 and carries a CVSS v3.1 base score of 10.0 (Critical), requiring no authentication and no user interaction to exploit over the network.

Technical details

  • Root cause: Apache Traffic Server fails to correctly parse HTTP chunked transfer-encoding when message bodies are malformed, enabling an attacker to desynchronize the request processing pipeline between ATS and a backend origin server (CWE-444).
  • Trigger conditions: An unauthenticated attacker sends a specially crafted HTTP request containing a malformed chunked message body to an ATS instance accessible over the network.
  • Attack vector: Network-accessible; no privileges required (PR:N), no user interaction required (UI:N), low attack complexity (AC:L).
  • Impact: Successful exploitation allows HTTP request smuggling, whereby the attacker can cause ATS and an upstream server to disagree on HTTP request boundaries. The CVSS scope is Changed (S:C), enabling impact on components beyond ATS itself, with High Confidentiality impact (C:H) and High Integrity impact (I:H) — enabling outcomes such as cache poisoning, bypass of security controls, interception of sensitive data from other users’ requests, and session hijacking.

Affected software

  • Apache Traffic Server 8.0.0 through 8.1.9
  • Apache Traffic Server 9.0.0 through 9.2.14
  • Apache Traffic Server 10.0.0 through 10.1.3

Severity

CVSS v3.1 Base Score: 10.0 (Critical)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L

Mitigation and recommended actions

  • Immediate patch: Upgrade to Apache Traffic Server 9.2.15 or 10.1.4, which contain the official fix from the Apache Software Foundation. The 8.x branch does not have a patched release; users on 8.x should migrate to a supported branch (9.2.15 or 10.1.4).
  • Network mitigation (if patching is not immediately possible): Restrict external access to ATS instances at the network perimeter and audit proxy configurations to reduce exposure while a maintenance window is scheduled.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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