CVE-2026-100864heym before 0.0.91 Remote Code Execution via Expression Engine
Updated under an hour ago ()
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It affects heymrun heym. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.69%, higher than 51% of scored CVEs.
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heym before 0.0.91 contains a sandbox escape vulnerability in the expression engine's DotList map/filter and fallback resolver that allows authenticated users to execute arbitrary Python code. Attackers can craft workflow expressions using dunder attribute access through item expressions or the fallback resolver to access os.system and execute commands as the backend process.
- CVSS
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-94
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.69% (percentile 51)
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Sep 28, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
heymrun heym heymrun:heym (from the name) | before 0.0.91; 0.0.91 not affected | CNA record |
References
- https://github.com/heymrun/heym/security/advisories/GHSA-87x2-9jwx-7gh4vendor-advisory
- https://www.vulncheck.com/advisories/heym-before-0.0.91-remote-code-execution-via-expression-enginethird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.