Vulnerability in Kyverno
CVE-2026-122323
Kyverno from 1.11.0 before 1.19.2 contains an unbounded decompression vulnerability in FetchSignatureBlob that allows attackers to exhaust memory by supplying highly compressed notary signature layers. Attackers who control registry referrers or signatures can publish small gzip layers that decompress beyond maxPayloadSize, causing admission controller OOM kills and denial of service.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/kyverno/kyverno/security/advisories/GHSA-fr24-3hvf-393q (vendor-advisory)
- www.vulncheck.com/advisories/kyverno-1.11.0-before-1.19.2-memory-exhaustion-via… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-122323?
- CVE-2026-122323 is a high-severity vulnerability in Kyverno, classified under Improper Handling of Highly Compressed Data (Data Amplification). CVSS score: 7.5/10. Published 2026-11-05.
- How severe is CVE-2026-122323?
- High severity. CVSS v3 base score is 7.5 out of 10.