CVE-2026-82477 Server-side request forgery in Heimdall
Remote attackers can access internal network resources via the Tenable proxy endpoint in MITRE SAF Heimdall.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-82477?
CVE-2026-82477 is a medium-severity server-side request forgery vulnerability in MITRE Heimdall, published on 29 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In MITRE SAF Heimdall 2.11.6 through 2.13.x before 2.14.0, an SSRF issue allows remote attackers to access internal network resources via the Tenable proxy endpoint. This occurs in apps/backend/src/tenable/tenable.controller.ts.
Weakness: CWE-918
Which versions are affected by CVE-2026-82477?
How do I fix CVE-2026-82477?
No fix has been published for CVE-2026-82477 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-82477 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-82477 exists.
Sources
Also known as GHSA-g9vx-2rpf-gpch, GHSA-mgq6-mc59-8j8m.