CVE-2026-91080 webhook through 2.8.3 Memory Exhaustion via Oversized Request Body
Unauthenticated attackers can crash the webhook service by sending oversized request bodies, causing memory exhaustion.
- 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-2026-91080?
CVE-2026-91080 is a high-severity denial of service vulnerability in adnanh webhook, published on 14 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
webhook through 2.8.3 reads the entire request body into memory before evaluating trigger rules, allowing unauthenticated attackers to exhaust memory by sending oversized bodies. Attackers can send multi-gigabyte request bodies with invalid signatures to trigger out-of-memory conditions and crash the service.
Weakness: CWE-770
Which versions are affected by CVE-2026-91080?
How do I fix CVE-2026-91080?
No fix has been published for CVE-2026-91080 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-91080 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-91080 exists.
Sources
Also known as GHSA-4wr8-3xfv-vhj5.