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CVE-2026-58187: Apache Traffic Server can be forced to stop responding

CVE-2026-58187 · published 3 months ago

Summary

The multiplexer plug‑in in Apache Traffic Server may run out of space when handling certain data streams, which can cause the server to become unresponsive. This affects versions from 8.0.0 up to 8.1.11, 9.0.0 up to 9.2.14, and 10.0.0 up to 10.1.3. Upgrade to version 9.2.15 or 10.1.4 (or later) to resolve the issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software

Ecosystem	Vendor	Product	Affected versions
Ubuntu:16.04:LTS	canonical	trafficserver	All versions
Ubuntu:18.04:LTS	canonical	trafficserver	All versions
Ubuntu:Pro:20.04:LTS	canonical	trafficserver	All versions
Ubuntu:Pro:22.04:LTS	canonical	trafficserver	All versions
Ubuntu:24.04:LTS	canonical	trafficserver	All versions
–	apache software foundation	apache traffic server	<= 8.1.9 <= 8.1.11
Debian:11	debian	trafficserver	All versions
Debian:12	debian	trafficserver	All versions
–	apache	traffic_server	>= 8.0.0, <= 8.1.9 >= 9.0.0, < 9.2.15 >= 10.0.0, < 10.1.4 `cpe:2.3:a:apache:traffic_server::::::::`

Original advisory text

Apache Traffic Server: Multiplexer plugin chunk decoder enables a denial of service

The Apache Traffic Server multiplexer plugin overruns its chunk-decode buffer on upstream input, enabling denial of service.

This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, 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.

References

https://security-tracker.debian.org/tracker/CVE-2026-58187 Vendor Advisory
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58187... Vendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-58187 Vendor Advisory
https://ubuntu.com/security/CVE-2026-58187 Third Party Advisory
https://www.cve.org/CVERecord?id=CVE-2026-58187 Third Party Advisory
https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d Vendor Advisory

Fix within

Internet-facing 60 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit
Gives an attacker partial control

Severity

7.8 High

Exploitation

<1% chance of attack within 30 days

Type

CWE-787Out-of-bounds Write

Timeline

Published29 Jul 2026

Updated4 Nov 2026

First seen29 Jul 2026

Sources

DEBIAN-CVE-2026-58187 · OSV

CVE-2026-58187 · NVD

CVE-2026-58187 · MITRE

UBUNTU-CVE-2026-58187 · OSV

CVE-2026-58187 · OSV

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