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CVE-2026-58163 – Cache State Corruption / Integrity Impact – Apache Traffic Server 8.0.0–10.1.3

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Summary

CVE-2026-58163 is a high-severity vulnerability in Apache Traffic Server (ATS), an open-source reverse proxy and caching server widely deployed at the internet edge. The flaw stems from deserialization of untrusted data (CWE-502): ATS mishandles on-disk cache fields and object lifetimes, leading to cache state corruption or server crashes. It is exploitable remotely without authentication and carries a CVSS v3.1 score of 7.5 (HIGH).

Technical details

  • Root cause: Improper deserialization of on-disk cache fields and mismanagement of object lifetimes (CWE-502), allowing the cache subsystem to reach a corrupt state when processing attacker-influenced cached content.
  • Trigger conditions: The vulnerability can be triggered remotely over the network with no privileges and no user interaction required (CVSS PR:N, UI:N, AC:L).
  • Attack vector: Network-reachable (AV:N); ATS exposes itself via standard HTTP response headers (Server: ATS/x.x.x, Via, X-Cache), making instances trivially identifiable and targetable.
  • Impact: High integrity impact (I:H) — corrupted cache state can cause ATS to serve manipulated or malicious content to downstream users. The official description also explicitly identifies crashes as an outcome, indicating real availability impact beyond what the CVSS v3.1 vector alone captures. The CVSS v4.0 score (8.3 HIGH) reflects Availability: High at the base level.

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 — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
  • CVSS v4.0 Base Score: 8.3 HIGH — CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Upgrade to Apache Traffic Server 9.2.15 or 10.1.4, which contain the official fix released by the Apache Software Foundation.
  • Users on the 8.x branch should migrate to a supported release line (9.2.15 or 10.1.4), as no patch has been issued for the 8.x series.
  • If immediate patching is not possible, restrict public network access to ATS instances and suppress version-disclosing response headers to limit fingerprinting.

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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