# CVE-2026-122323: Kyverno 1.11.0 before 1.19.2 Memory Exhaustion via Notary Signature Decompression

Status: published. Published: 2026-11-05. Updated: 2026-11-05.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- kyverno / kyverno (kyverno): ≥ 1.11.0; < 1.19.2 (affected, semver); 1.19.2 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.7 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-409

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/kyverno/kyverno/security/advisories/GHSA-fr24-3hvf-393q (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/kyverno-1.11.0-before-1.19.2-memory-exhaustion-via-notary-signature-decompression (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-122323; retrieved 2026-11-05; source updated 2026-11-05

Revision: 8cc611ca1602273d5a2b3ddb7a4cdd8496447ab25953b74f76fa3175236c681c

Canonical: https://y2.dev/cve/CVE-2026-122323

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