CVE-2026-58178 Apache Traffic Server: ESI plugin allows uncontrolled recursion and server-side request forgery
Attackers can trigger uncontrolled recursion and fetch arbitrary URLs via the ESI plugin, leading to server-side request forgery and potential denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-58178?
CVE-2026-58178 is a high-severity server-side request forgery vulnerability in Apache Traffic Server, published on 29 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Apache Traffic Server ESI plugin can recurse without bound and fetch attacker-controlled URLs.
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.
Weakness: CWE-674
Which versions are affected by CVE-2026-58178?
It affects 1 product.
Products include Apache Traffic Server.
How do I fix CVE-2026-58178?
Upgrade to a fixed version.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-58178 being exploited?
There is no known exploitation of CVE-2026-58178 in the wild and no public exploit code.
Other vulnerabilities in Apache Traffic Server
Sources
Also known as DEBIAN-CVE-2026-58178, GHSA-jmf6-wg5m-793g, UBUNTU-CVE-2026-58178.