What is CVE-2026-40903?

CVE-2026-40903 is a critical-severity vulnerability in Goshs, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 9.1/10. Published 2026-04-21.

How severe is CVE-2026-40903?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Goshs

CVE-2026-40903

goshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.6, goshs has an ArtiPACKED vulnerability. ArtiPACKED can lead to leakage of the GITHUB_TOKEN through workflow artifacts, even though the token is not present in the repository source code. This vulnerability is fixed in 2.0.0-beta.6.

Published 2026-04-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (34.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002

Affected products

Goshs — versions 2.0.0
Patrickhener Goshs — versions < 2.0.0-beta.6

Weakness classification (CWE)

CWE-829 — Inclusion of Functionality from Untrusted Control Sphere

References

github.com/patrickhener/goshs/security/advisories/GHSA-hpxj-9fgp-fhhf (Vendor Advisory)

Frequently asked questions

What is CVE-2026-40903?: CVE-2026-40903 is a critical-severity vulnerability in Goshs, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 9.1/10. Published 2026-04-21.
How severe is CVE-2026-40903?: Critical severity. CVSS v3 base score is 9.1 out of 10.