What is CVE-2026-45227?

CVE-2026-45227 is a high-severity vulnerability in Heymrun Heym, classified under Protection Mechanism Failure. CVSS score: 8.8/10. Published 2026-05-12.

How severe is CVE-2026-45227?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Heymrun Heym

CVE-2026-45227

Heym before 0.0.21 contains a sandbox escape vulnerability in the custom Python tool executor that allows authenticated workflow authors to bypass sandbox restrictions by using object-graph introspection primitives. Attackers can use Pytho…

EPSS: 0.001 (15.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Heymrun Heym — versions 0, 32b7e809d987d9b018ec8daa2cdaf48f627f26f1

Weakness classification (CWE)

CWE-693 — Protection Mechanism Failure

References

disclosure@vulncheck.com (release-notes)
disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-45227?: CVE-2026-45227 is a high-severity vulnerability in Heymrun Heym, classified under Protection Mechanism Failure. CVSS score: 8.8/10. Published 2026-05-12.
How severe is CVE-2026-45227?: High severity. CVSS v3 base score is 8.8 out of 10.