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CVE-2026-58188 – Memory-Safety / Limit-Bypass Flaws in Experimental Plugins – Apache Traffic Server

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Summary

CVE-2026-58188 is a memory-safety and limit-bypass vulnerability affecting several experimental plugins shipped with Apache Traffic Server. The flaw is classified as an out-of-bounds write (CWE-787) and is remotely exploitable over the network without authentication or user interaction, carrying a CVSS v3.1 base score of 8.2 (HIGH).

Technical details

  • Root cause: Several Apache Traffic Server experimental plugins contain memory-safety errors (out-of-bounds write, CWE-787) as well as limit-bypass errors that allow established processing limits to be circumvented.
  • Trigger conditions: Exploitation requires a deployment that has one or more of the affected experimental plugins enabled; crafted network requests processed by these plugin code paths can drive the memory-safety and limit-bypass conditions.
  • Attack vector: Network (AV:N), low attack complexity, no privileges and no user interaction required.
  • Impact: Primarily high availability impact with a limited integrity impact — the memory-safety errors can destabilize the server, while the limit-bypass errors permit exceeding intended constraints.

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

Mitigation and recommended actions

  • Immediate: Upgrade to a fixed release — Apache Traffic Server 9.2.15 or 10.1.4. Deployments on the 8.x branch should migrate to a supported, fixed release.
  • If no patch: Disable the affected experimental plugins in your Traffic Server configuration until the upgrade can be applied, and restrict network exposure of the proxy to trusted clients where feasible.

References

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