# CVE-2026-100704: Kyverno before 1.19.1 ImageValidatingPolicy Exception Bypass

> Attackers can bypass image signature verification in Kyverno by exploiting a flaw in PolicyException handling, allowing unsigned images into the cluster.

- **Severity:** High 8.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 26 Sep 2026
- **Updated:** 28 Sep 2026
- **Also known as:** BIT-kyverno-2026-100704, GHSA-435c-9ffq-3prr, GHSA-5cjf-wwfg-pj4c, MINI-29jx-c3v6-3m72, MINI-2w89-g84p-q7rf, MINI-72mh-m64m-jqx7, MINI-85rr-2h5r-8p5p, MINI-96wm-8hh6-g95r, MINI-9rxm-v5p6-6p78, MINI-cv3x-wx8v-w8hw, MINI-fr9c-c849-wvg9, MINI-mpj4-234q-j3rx, MINI-w4wg-qx9j-3qh6

## What is CVE-2026-100704?

CVE-2026-100704 is a high-severity vulnerability in kyverno, published on 26 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Kyverno is a policy engine for Kubernetes. In versions 1.14.0 through 1.19.0, the ImageValidatingPolicy (policies.kyverno.io/v1beta1) evaluator never reads the spec.images and spec.allowedValues fields of a PolicyException. Any PolicyException whose policyRefs and matchConditions match a resource causes image signature verification to be skipped for the entire resource rather than only for the listed images or values, so an exception intended to exempt a single trusted image exempts every image on the matched resource(s). As a result, unsigned or untrusted images can be admitted to the cluster without signature verification. This differs from ValidatingPolicy, GeneratingPolicy, and MutatingPolicy, which treat the same field as a partial exemption. The issue is fixed in version 1.19.1.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2026-100704?

1 open source package ship an affected version, including kyverno.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `kyverno` | Bitnami | From 1.14.0 | 1.19.1 |

## How do I fix CVE-2026-100704?

Upgrade kyverno to 1.19.1 or later.

## Is CVE-2026-100704 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100704 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-100704 and fix it if it is affected.

What it is: CVE-2026-100704 is a high-severity vulnerability in kyverno, published on 26 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100704 exists.

Affected packages and fixed versions:
- kyverno (Bitnami): affected from 1.14.0; fixed in 1.19.1

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-2026-100704/ (Markdown: https://insights.sbomify.com/CVE-2026-100704/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-100704
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-100704
- OSV: https://osv.dev/vulnerability/CVE-2026-100704

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-100704/
Summaries are generated and may contain mistakes; the official description above is the record.