Quick answers
- Is CVE-2026-100861 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-100861 being exploited in the wild.
- How severe is CVE-2026-100861?
- Medium severity, with a CVSS score of 5, published 27 September 2026.
- Which products and versions are affected?
- Heymrun Heym before 0.0.105.
- Is there a fix for CVE-2026-100861?
- A patch was published on 2026-09-27: Fixed in version 0.0.105 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-100861 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-100861?
- Check whether you run Heymrun Heym at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a server-side request forgery (SSRF) in integration services that accept credential-supplied base URLs. Services including Jira, Grist, Supabase, Sentry, GitHub, and LLM providers construct HTTP clients directly from user-controlled credentials without applying the egress guard that normally blocks requests to private, loopback, or cloud-metadata addresses. An authenticated attacker can create credentials pointing to internal addresses and trigger workflow execution to read the response as node output.
Affected products
- heymrun heym before 0.0.105
Timeline
- 2026-09-27: disclosed
- 2026-09-27: patched: Fixed in version 0.0.105