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CVE-2026-58157 – Cross-Connection Information Disclosure – Apache Traffic Server 8.0.0–8.1.9, 9.0.0–

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Summary

CVE-2026-58157 is an information-disclosure vulnerability in Apache Traffic Server caused by improper reuse of server sessions and tunnels, which can expose data across separate client connections. An unauthenticated, network-based attacker may be able to obtain sensitive information belonging to other clients. The issue is rated HIGH severity with a CVSS v3.1 base score of 8.7.

Technical details

  • Root cause: Apache Traffic Server can improperly reuse server sessions and tunnels, allowing state associated with one client connection to be exposed on another (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor).
  • Trigger conditions: Occurs when the proxy reuses upstream/server sessions and tunnels across distinct client connections rather than keeping them isolated.
  • Attack vector: Network (remote); no authentication or user interaction required. High attack complexity.
  • Impact: Sensitive data can leak between separate client connections, resulting in high confidentiality and integrity impact and a scope change (data crossing a trust boundary between clients).

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

Mitigation and recommended actions

  • Immediate: Upgrade to a fixed release:
    • 9.x branch: upgrade to 9.2.15 or later
    • 10.x branch: upgrade to 10.1.4 or later
  • If no patch can be applied immediately: The 8.x branch is affected and out of the actively fixed release lines, so migrate to a supported, patched release (9.2.15+ or 10.1.4+). Because the flaw stems from improper server session/tunnel reuse, review and restrict connection-reuse and keep-alive settings between the proxy and origin servers where feasible until upgrading, and monitor for anomalous cross-client data exposure.

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