# CVE-2026-122321: Kyverno 1.18.0 before 1.19.2 verifyImages Cache Signature Verification Bypass


- **Severity:** High 8.5 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/SC:L/SI:H/SA:L`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 5 Nov 2026
- **Updated:** 9 Nov 2026
- **Also known as:** GHSA-2r43-6962-xcw5, GHSA-2vqq-m4qm-q6m7

## What is CVE-2026-122321?

CVE-2026-122321 is a high-severity vulnerability in kyverno, published on 5 Nov 2026. 

### Official description

Kyverno 1.18.0 before 1.19.2 contains a signature verification bypass in verifyImages because cached verification results are keyed by the image reference string (such as a tag) rather than bound to the verified digest, so cache hits skip signature and attestation checks. An attacker who can submit workloads and move a registry tag can warm the cache with a signed image, repoint the tag, and have Kyverno admit the workload and use mutateDigest to pin the unverified digest.

Weakness: CWE-367 (Time-of-check Time-of-use (TOCTOU) Race Condition)

## Which versions are affected by CVE-2026-122321?

It affects 1 product.


Products: Kyverno.

## How do I fix CVE-2026-122321?

No fix has been published for CVE-2026-122321 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-122321 being exploited?

There is no known exploitation of CVE-2026-122321 in the wild and no public exploit code.

## Other vulnerabilities in kyverno

- [CVE-2026-22039](https://insights.sbomify.com/CVE-2026-22039/): Kyverno Cross-Namespace Privilege Escalation via Policy apiCall (critical 10.0)
- [CVE-2026-4789](https://insights.sbomify.com/CVE-2026-4789/): CVE-2026-4789 (critical 9.8)
- [CVE-2026-122303](https://insights.sbomify.com/CVE-2026-122303/): Kyverno 1.17.0 before 1.19.2 Cross-Namespace Resource Overwrite via NamespacedMutatingPolicy (critical 9.4)
- [CVE-2026-122304](https://insights.sbomify.com/CVE-2026-122304/): Kyverno 1.17.0 before 1.19.2 Privilege Escalation via CleanupPolicy Context Loader (critical 9.4)
- [CVE-2026-122310](https://insights.sbomify.com/CVE-2026-122310/): Kyverno 1.19.1 before 1.19.2 Privilege Escalation via Policy apiCall urlPath (critical 9.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-122321 and fix it if it is affected.

What it is: CVE-2026-122321 is a high-severity vulnerability in kyverno, published on 5 Nov 2026. 
Exploitation: There is no known exploitation of CVE-2026-122321 in the wild and no public exploit code.

Affected product: kyverno. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-122321/ (Markdown: https://insights.sbomify.com/CVE-2026-122321/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-122321
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-122321
- OSV: https://osv.dev/vulnerability/CVE-2026-122321

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-122321/
Summaries are generated and may contain mistakes; the official description above is the record.