What’s Vulnerable › Vulnerabilities

CVE-2026-91080: webhook through 2.8.3 Memory Exhaustion via Oversized Request Body

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-14 · updated 2026-09-23
• Weakness: CWE-770

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: through 2.8.3

References

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

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