CVE-2026-100861: heym before 0.0.105 SSRF via credential-controlled base URLs

Severity: medium (CVSS 5.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-27 · updated 2026-09-28
Weakness: CWE-918

Description

heym before 0.0.105 fails to apply egress guards to integration services that use credential-supplied base URLs, allowing authenticated users to bypass SSRF protections. Attackers can configure credentials pointing to loopback, private, or cloud-metadata addresses and read internal service responses returned as workflow node output.

Affected products

heymrun heym: before 0.0.105 — fixed in 0.0.105

How to fix

Upgrade to a fixed version: heymrun heym 0.0.105. Check the vendor advisory for mitigations.

References

https://github.com/heymrun/heym/security/advisories/GHSA-xchj-mw74-2232
https://www.vulncheck.com/advisories/heym-before-0.0.105-ssrf-via-credential-controlled-base-urls
https://github.com/heymrun/heym/security/advisories/GHSA-xchj-mw74-2232

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