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Vulnerability record · CVE-2026-100864 · published 27 September 2026

CVE-2026-100864: Code injection vulnerability

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.

8.7 CVSS 4.0 High CWE-94 · Code injection Received
8.7CVSS 4.0 base score
—EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
27 Sep 2026Last modified by NVD

Description

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:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/heymrun/heym/security/advisories/GHSA-87x2-9jwx-7gh4
https://www.vulncheck.com/advisories/heym-before-0.0.91-remote-code-execution-via-expression-engine

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Source: NIST National Vulnerability Database (record CVE-2026-100864), CISA KEV, FIRST EPSS. This page is refreshed as NVD updates the record.