8.3

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

Awaiting analysis
AliasesCGA-3wx2-rmcm-5qhrCGA-hxc3-8p53-mjr4CGA-m94v-hcxw-7866
Published 26-09-2026Last modified 28-09-2026

Vulnerability summary

CVE-2026-100704 is a high (CVSS 8.3) Incorrect Authorization vulnerability in kyverno. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 12.4% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 8.3, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
8.3/10
010
High · v4.0 (CVE.org)
EPSS score
0.22%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 26-09-2026
    PublishedVulnerability first disclosed.
  2. 28-09-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 2 sources · 2 versions

EPSS trend

Probability

0.22%

Chance of exploitation in the next 30 days

Percentile

12%

Versus all other CVEs

30-day change

Increase +0.04 pp

From 0.18% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard4 products
  • kyverno-1.15All versions (No fix recorded)
  • kyverno-1.16All versions (No fix recorded)
  • kyverno-1.17All versions (No fix recorded)
  • kyverno-1.18All versions (No fix recorded)
Wolfi2 products
  • kyverno-1.17All versions (No fix recorded)
  • kyverno-1.18All versions (No fix recorded)
Kyverno1 product

3 vendors · 7 products

References

2 links