Medium severity6.3NVD Advisory· Published Aug 19, 2026· Updated Aug 19, 2026

CVE-2026-76239

Description

Stigmem before 0.9.0a11 fails to validate the delivery_address parameter when creating webhook subscriptions, allowing authenticated users to specify internal loopback and private network destinations. Attackers can trigger matching fact-change events to cause the Stigmem server to issue server-side HTTP POST requests to internal services, enabling blind SSRF attacks against localhost and private network endpoints.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Eidetic Labs/stigmemllm-fuzzy
Range: <0.9.0a11

Patches

Vulnerability mechanics

References

github.com/eidetic-labs/stigmem/security/advisories/GHSA-5p3m-vhh6-9236nvd
www.vulncheck.com/advisories/stigmem-before-0a11-ssrf-via-unvalidated-webhook-delivery-addressnvd

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cvss	0.410
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000