Is CVE-2026-58187 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-58187 being exploited in the wild.

How severe is CVE-2026-58187?

Low severity, with a CVSS score of 3.7, published 29 July 2026.

Which products and versions are affected?

Apache Traffic Server 8.0.0 through 8.1.9, 9.0.0 through 9.2.14, 10.0.0 through 10.1.3.

Is there a fix for CVE-2026-58187?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-58187 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-58187?

Check whether you run Apache Traffic Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-58187: Apache Traffic Server out-of-bounds write in multiplexer plugin

CVE-2026-58187 · Severity: low · CVSS 3.7 · Published 2026-07-29

Apache Traffic Server, a high-performance caching proxy used to manage web traffic, contains a vulnerability in its multiplexer plugin. An attacker can send specific data that causes the software to crash or become unresponsive. This could lead to a temporary disruption of web services and content delivery for organizations using the affected versions.

Technologies: Apache Traffic Server. Vendors: Apache.

Quick answers

Is CVE-2026-58187 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-58187 being exploited in the wild.
How severe is CVE-2026-58187?: Low severity, with a CVSS score of 3.7, published 29 July 2026.
Which products and versions are affected?: Apache Traffic Server 8.0.0 through 8.1.9, 9.0.0 through 9.2.14, 10.0.0 through 10.1.3.
Is there a fix for CVE-2026-58187?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-58187 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-58187?: Check whether you run Apache Traffic Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An out-of-bounds write vulnerability (CWE-787) exists in the multiplexer plugin of Apache Traffic Server. The flaw is triggered when the plugin processes upstream input, leading to a buffer overrun during chunk-decoding operations. A remote, unauthenticated attacker can exploit this to cause a denial of service (DoS) condition. The vulnerability affects versions 8.x, 9.x, and 10.x, and has been addressed in versions 9.2.15 and 10.1.4.

Affected products

Apache Traffic Server 8.0.0 through 8.1.9, 9.0.0 through 9.2.14, 10.0.0 through 10.1.3

Timeline

2026-07-29: disclosed
2026-07-29: advisory

References

https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.