5.4

CVE-2026-56743: cilium Incorrect Authorization

CVSS: 5.4v3.1MediumAnalyzed
AliasesCGA-97r3-6vcm-q392CGA-p335-r737-g8jvCGA-pcmh-vfh7-4pc4
Published 15-07-2026Last modified 16-07-2026
Open JSON

Vulnerability summary

CVE-2026-56743 is a medium (CVSS 5.4) Incorrect Authorization vulnerability in cilium. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 14.9% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.4/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.25%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 4
OPENSUSE-SU-2026:21897-1SUSE-SU-2026:23855-1SUSE-SU-2026:23863-1CGA-GJ46-6RC9-CW4Q

Timeline

  1. 15-07-2026
    PublishedVulnerability first disclosed.
  2. 16-07-2026
    Last modifiedVulnerability information updated.

Description

Cilium is a networking, observability, and security solution. From 1.19.0 to 1.19.4, standard Kubernetes NetworkPolicy specifications using CIDR-based ipBlock rules without pod or namespace selectors erroneously generate a wildcard namespace allow rule when Cilium is configured with a custom clusterName rather than the default any value. The parser incorrectly instantiates a pod selector on selectorless peer definitions, allowing traffic from other workloads in the same namespace as the subject of the policy. This issue is fixed in version 1.19.5.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

0.00 pp

From 0.25% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.25%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard6 products
  • cilium-1.19-operator-generic< 1.19.7-r7
  • kubescape< 4.0.12-r13
  • kubescape-server< 4.0.12-r12
  • kubescape-server-downloader< 4.0.12-r12
  • kubescape-server-fips< 4.0.12-r11
Wolfi2 products
  • cilium-1.19-operator-generic< 1.19.7-r7
  • kubescape< 4.0.12-r13
Cilium1 product
Github.com/cilium1 product
  • cilium≥ 1.19.0, < 1.19.5

4 vendors · 10 products

References

9 links