6.9

CVE-2026-53935: CiliumLocalRedirectPolicy addressMatcher allows cross-namespace service traffic hijacking and can break service translation

Deferred
AliasesCGA-2jq2-mwrq-cpwmCGA-3xfw-9952-42p2CGA-4m58-4fpm-5j44
Published 07-07-2026Last modified 08-07-2026

Vulnerability summary

CVE-2026-53935 is a medium (CVSS 6.9) Incorrect Authorization vulnerability in cilium. EPSS estimates a 0.34% chance of exploitation in the next 30 days, higher than 26.2% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.9/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.34%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 2
OPENSUSE-SU-2026:21483-1CGA-45MF-6VG4-XQ54

Timeline

  1. 07-07-2026
    PublishedVulnerability first disclosed.
  2. 08-07-2026
    Last modifiedVulnerability information updated.

Description

Cilium is a networking, observability, and security solution. Prior to 1.17.16, from 1.18.2 to 1.18.9, and from 1.19.0 to 1.19.3, users with the ability to create CiliumLocalRedirectPolicies can specify arbitrary ClusterIPs via addressMatcher, enabling hijacking traffic to Services in any namespace and bypassing namespace scoping enforced by serviceMatcher; deleting such a policy can also corrupt Cilium internal service state and stop service translation for the affected Service. This issue is fixed in versions 1.17.16, 1.18.10, and 1.19.4.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.34%

Chance of exploitation in the next 30 days

Percentile

26%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.34% on 22-09-2026

22-09-202622-10-2026

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

Chainguard21 products
  • cilium-1.16All versions (No fix recorded)
  • cilium-1.16-clustermesh-apiserverAll versions (No fix recorded)
  • cilium-1.16-hubble-relayAll versions (No fix recorded)
  • cilium-1.16-operator-awsAll versions (No fix recorded)
  • cilium-1.16-operator-genericAll versions (No fix recorded)
Wolfi3 products
  • hubble-ui-backend< 0.13.5-r8
  • kubescape< 4.0.10-r5
  • kubescape-operator< 0.2.172-r2 | < 0.2.151-r5
Cilium1 product
  • cilium< 1.17.16 | ≥ 1.18.2, < 1.18.10 | ≥ 1.19.0, < 1.19.4
Github.com/cilium1 product
  • cilium≥ 1.18.2, < 1.18.10 | < 1.17.16 | ≥ 1.19.0, < 1.19.4

4 vendors · 26 products

References

13 links
Show all 13 references