CVE-2026-40032: tclahr UAC

UAC < 3.3.0-rc1 Command Injection via Placeholder Substitution

CVSS 8.5 HighEPSS 0.0074 · 55th percentile

Published by the CVE Program (CNA: VulnCheck) at 8 Apr 2026, 21:35 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
tclahr	UAC	affected before 3.3.0-rc1 semver unaffected 3.3.0-rc1 semver Other versions: unaffected

Identifiers

CVE-2026-40032

CNA

VulnCheck

Weakness (CWE)

CWE-78

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.5	High	4.0	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	CNA (VulnCheck)Used for this record
7.8	High	3.1	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0074, the 55th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

8 Apr 2026, 21:35 UTC Confirmed by the CVE List

Sources

References from the CNA

github.com/tclahr/uac/pull/443 issue-trackingpatch
github.com/tclahr/uac/commit/cb95d7166cd47908e1189d9669e43f9a6d3d707f patch
github.com/tclahr/uac/commit/50ace60e172e38feb78347bdf579311c23eff078 patch
github.com/tclahr/uac/commit/d0fca5e36d8d6a33a4404f0f6fe92b0424544589 patch
github.com/tclahr/uac/issues/429 issue-tracking
mobasi.ai/sentinel vendor-advisory
www.vulncheck.com/advisories/uac-rc1-command-injection-via-placeholder-substitution third-party-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.