What is CVE-2026-58157?

CVE-2026-58157 is a high-severity vulnerability in Apache Traffic Server, classified under Information Disclosure. CVSS score: 8.7/10. Published 2026-07-29.

How severe is CVE-2026-58157?

High severity. CVSS v3 base score is 8.7 out of 10.

Information disclosure in Apache Traffic Server

CVE-2026-58157

Apache Traffic Server can reuse server sessions and tunnels improperly, exposing data across client connections. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.9, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue.

Vulnerability class: Information Disclosure

EPSS: 0.003 (19.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 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.

Affected products

Apache Traffic_server
Apache Software Foundation Traffic Server — versions 8.0.0, 9.0.0, 10.0.0

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)

Frequently asked questions

What is CVE-2026-58157?: CVE-2026-58157 is a high-severity vulnerability in Apache Traffic Server, classified under Information Disclosure. CVSS score: 8.7/10. Published 2026-07-29.
How severe is CVE-2026-58157?: High severity. CVSS v3 base score is 8.7 out of 10.