Bug 2567673 (CVE-2026-122323)

Summary: CVE-2026-122323 github.com/kyverno/kyverno: Kyverno: Denial of Service via unbounded signature decompression
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: gbenhaim, niyer, twaugh
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Kyverno. An attacker who controls container registry referrers or signatures can trigger a Denial of Service (DoS) by supplying specially crafted, highly compressed signature layers. When Kyverno decompresses these payloads, it fails to enforce size limits, resulting in memory exhaustion and causing the admission controller to crash due to out-of-memory (OOM) conditions.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-11-05 22:17:04 UTC 
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.