CVE-2026-100864 heym - Remote Code Execution

heym < 0.0.91 contains a sandbox escape vulnerability caused by dunder attribute access in the expression engine's DotList map/filter and fallback resolver, letting authenticated users execute arbitrary Python code.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.69% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Remote Code Execution
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
27 September 2026
Updated
15 October 2026
Weakness
CWE-94

Vendor fix

Update to version 0.0.91 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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