Vulnerability · Published Aug 19, 2026 · Assigned by VulnCheck

CVE-2026-76239Stigmem before 0.9.0a11 SSRF via unvalidated webhook delivery_address

Medium 6.3

In plain English

A medium-severity server-side request forgery in stigmem-node from eidetic-labs. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.3Medium

Exploit odds (30 days)0.3%top 74.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	stigmem-node	0.9.0a11	GHSA-5p3m-vhh6-9236

Affected products (as reported)

Vendor	Product	Versions
eidetic-labs	stigmem-node	0 – before 0.9.0a11

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

References

GitHub Security Advisory (GHSA-5p3m-vhh6-9236) vendor-advisory
VulnCheck Advisory: Stigmem before 0.9.0a11 SSRF via unvalidated webhook delivery_address third-party-advisory