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CVE-2026-58177 – Path Traversal / Out-of-Bounds Write / Use-After-Free – Apache Traffic Server 10…

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Summary

CVE-2026-58177 is a high-severity vulnerability affecting the Cripts scripting framework component within Apache Traffic Server (ATS), a widely deployed enterprise-grade HTTP reverse proxy and caching server maintained by the Apache Software Foundation. The flaw encompasses three distinct vulnerability classes — out-of-bounds writes, path traversal, and use-after-free errors — and is remotely exploitable without authentication or user interaction. All ATS installations running versions 10.0.0 through 10.1.3 with the Cripts framework in use are potentially at risk, and upgrading to version 10.1.4 is strongly recommended.

Technical details

  • Root cause: Multiple memory safety and file system handling flaws in the Apache Traffic Server Cripts framework: out-of-bounds write errors (CWE-787), path traversal weaknesses, and use-after-free conditions.
  • Attack vector: Network-reachable (AV:N); an unauthenticated remote attacker can target internet-exposed ATS instances directly. No privileges (PR:N) and no user interaction (UI:N) are required.
  • Trigger conditions: Exploitation requires the Cripts framework to be active within the ATS deployment; Attack Complexity is rated High (AC:H), indicating specific conditions must be met for successful exploitation.
  • Impact: The CVSS Scope metric is Changed (S:C), meaning a successful exploit can affect components beyond the ATS process itself. The combination of vulnerability classes creates risk across three dimensions:
    • Confidentiality (C:L): Path traversal enables unauthorized access to files on the server’s filesystem.
    • Integrity (I:L): Out-of-bounds writes and use-after-free conditions may allow limited corruption of data or process state.
    • Availability (A:H): Memory corruption flaws (use-after-free, out-of-bounds writes) can trigger crashes and denial of service.

Affected software

  • Apache Traffic Server versions 10.0.0 through 10.1.3 (inclusive)

Severity

  • CVSS v3.1 Base Score: 8.1 (High)
  • Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:H

Mitigation and recommended actions

  • Immediate patch: Upgrade Apache Traffic Server to version 10.1.4, which contains the fix for this vulnerability per the Apache Software Foundation’s advisory.
  • If immediate patching is not feasible: Review whether the Cripts framework is actively configured and in use within your ATS deployment; disabling or restricting the Cripts component may reduce exposure until the patch can be applied. Enforce network-level controls to limit unauthenticated access to ATS instances where possible.

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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