# CVE-2026-91080

## Summary

- **CVE ID:** CVE-2026-91080
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-770
- **Published:** Sep 14, 2026
- **Last Modified:** Sep 14, 2026

## 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.

## Affected Products

- adnanh — webhook (0)

## References

- [CNA](https://github.com/adnanh/webhook/issues/756)
- [CNA](https://github.com/adnanh/webhook)
- [CNA](https://github.com/adnanh/webhook/blob/2.8.3/webhook.go)
- [CNA](https://www.vulncheck.com/advisories/webhook-through-2.8.3-memory-exhaustion-via-oversized-request-body)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.59%
- **EPSS Percentile:** 46.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._