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CVE-2026-58177 – Out-of-Bounds Write / Path Traversal / Use-After-Free – Apache Traffic Server 10.0.

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Summary

CVE-2026-58177 is a set of memory-safety and path-traversal flaws in the Cripts scripting framework of Apache Traffic Server. The issues include out-of-bounds writes (CWE-787), path traversal, and use-after-free errors affecting Apache Traffic Server versions 10.0.0 through 10.1.3. It carries a CVSS v3.1 base score of 8.1 (HIGH).

Technical details

  • Root cause: Multiple memory-safety and input-handling defects in the Cripts framework — the C++ scripting/plugin layer used to author remap and global processing logic in Apache Traffic Server. The defects include out-of-bounds writes (CWE-787), path traversal, and use-after-free conditions.
  • Trigger conditions: Exploitation requires specific conditions to be met (reflected in the High attack complexity of the CVSS vector), such as the server running affected Cripts-based logic that mishandles attacker-influenced input.
  • Attack vector: Network (AV:N). The vulnerability is reachable remotely without authentication (PR:N) and without user interaction (UI:N).
  • Impact: Successful exploitation can lead to out-of-bounds memory writes and use-after-free conditions, and path traversal beyond intended file boundaries. The CVSS scope is Changed (S:C), with low confidentiality and integrity impact and high availability impact — consistent with memory corruption that can crash or destabilize the service and expose or alter limited data.

Affected software

  • Apache Traffic Server 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: Upgrade to Apache Traffic Server 10.1.4 or later, which resolves these issues.
  • If no patch can be applied immediately: Review and restrict any Cripts-based remap/global logic that processes untrusted input, and place network access controls in front of the proxy to limit exposure of the management and request-handling surface until the upgrade can be completed.

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