Resource exhaustion in Adnanh Webhook
CVE-2026-91080
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (51.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/adnanh/webhook/issues/756 (issue-tracking)
- github.com/adnanh/webhook (product)
- github.com/adnanh/webhook/blob/2.8.3/webhook.go (technical-description)
- www.vulncheck.com/advisories/webhook-through-2.8.3-memory-exhaustion-via-oversi… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-91080?
- CVE-2026-91080 is a high-severity vulnerability in Adnanh Webhook, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-09-14.
- How severe is CVE-2026-91080?
- High severity. CVSS v3 base score is 7.5 out of 10.