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CVE-2026-58164 – Denial of Service (Use-After-Free) – Apache Traffic Server 8.0.0–8.1.9, 9.0.0–9.2.1

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Summary

CVE-2026-58164 is a use-after-free vulnerability (CWE-416) combined with a time-of-check/time-of-use (TOCTOU) race condition in the remap configuration handling of Apache Traffic Server. A remote, unauthenticated attacker can exploit the flaw over the network to disrupt availability, resulting in a high-severity (CVSS 7.5) denial-of-service condition.

Technical details

  • Root cause: Improper object lifetime management (use-after-free) together with time-of-check/time-of-use (TOCTOU) race conditions in how Apache Traffic Server processes remap configuration.
  • Trigger conditions: The race and dangling-reference condition can be reached during remap configuration handling on an affected server exposed to network traffic; no authentication or user interaction is required.
  • Attack vector: Network (AV:N), low attack complexity, no privileges and no user interaction required.
  • Impact: Availability impact only — exploitation can crash or destabilize the proxy service, causing a denial of service. No confidentiality or integrity impact is indicated in the CNA record.

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: 7.5 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Mitigation and recommended actions

  • Immediate (patch): Upgrade to a fixed release — Apache Traffic Server 9.2.15 (for the 9.x branch) or Apache Traffic Server 10.1.4 (for the 10.x branch).
  • 8.x deployments: The 8.x branch is affected and no fixed 8.x release is listed; migrate to a supported and patched branch (9.2.15 or 10.1.4).
  • If patching cannot be applied immediately: Restrict and monitor network exposure of the Traffic Server instance (e.g., limit reachable client networks via upstream firewalls/ACLs) and review remap configuration changes until the upgrade can be completed.

References

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