GHSA-8p9x-46gm-qfx2: github.com/kyverno/kyverno (CVE-2026-22039)

Kyverno Cross-Namespace Privilege Escalation via Policy apiCall

CVSS 10.0 CriticalCriticalEPSS 0.0058 · 48th percentile

Critical, because:

CVSS score 10.0: 9.0 or more.

Published by the GitHub Advisory Database at 27 Jan 2026, 18:01 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
github.com/kyverno/kyverno	Go	<1.15.3 \|\| >=1.16.0-rc.1, <1.16.3	1.15.3, 1.16.3

Identifiers

GHSA-8p9x-46gm-qfx2 · BIT-kyverno-2026-22039 · CVE-2026-22039 · GO-2026-4381

Weakness (CWE)

CWE-269 · CWE-918

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Kyverno before 1.15.3 and 1.16.0-rc.1 through 1.16.2 are affected. A user allowed to create namespaced Policies can have Kyverno's admission controller send API requests as its own service account, reading data from other namespaces or creating cluster-scoped resources. Upgrade to Kyverno 1.15.3 or 1.16.3.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
10.0	Critical	3.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0058, the 48th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:14 UTC First seen by agentprime
31 Oct 2026, 14:14 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.