IP Access Control Bypass in Apache Traffic Server
CVE-2026-58159

7HIGH

Key Information:

Vendor

Apache
Status
Apache Traffic Server
Vendor
CVE Published:
29 July 2026

What is CVE-2026-58159?

A serious issue has been identified in Apache Traffic Server that can allow unauthorized access by bypassing IP access control mechanisms on UDS listeners. This vulnerability arises from errors in access control list (ACL) matching, posing potential risks to network security. Users are advised to ensure their systems are updated to versions 9.2.15 or 10.1.4 to mitigate this vulnerability.

Affected Version(s)

Apache Traffic Server 8.0.0 <= 8.1.9

Apache Traffic Server 9.0.0 <= 9.2.14

Apache Traffic Server 10.0.0 <= 10.1.3

References

https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnoky...
vendor-advisory

CVSS V4

Score:
7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Apache Community
Omkhar Arasaratnam
.