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Fencer Intel
medium 6.9

CVE-2026-53935 json

CiliumLocalRedirectPolicy addressMatcher allows cross-namespace service traffic hijacking and can break service translation

published 4mo ago modified 2mo ago also BIT-cilium-2026-53935 , BIT-cilium-operator-2026-53935 , BIT-hubble-relay-2026-53935 , EUVD-2026-42101 , GHSA-q6h5-q3q6-f87x , GO-2026-5914

cvss
6.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 27%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/cilium/cilium 1.17.16, 1.18.10, 1.19.4
  • bitnami cilium 1.17.16, 1.18.10, 1.19.4
  • bitnami cilium-operator 1.17.16, 1.18.10, 1.19.4
  • bitnami hubble-relay 1.17.16, 1.18.10, 1.19.4
  • cilium cilium 1.17.16, 1.18.10, 1.19.4
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

Is CVE-2026-53935 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4mo ago

Exploit prediction

0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 6.9 CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:H
GitHub 3.1 6.9 CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:H
OSV 3.1 6.9 CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:H

Affected packages

ecosystem package affected fixed in
go github.com/cilium/cilium
>=1.19.0, <1.19.4
>=1.18.2, <1.18.10
<1.17.16
1.19.4
1.18.10
1.17.16
bitnami cilium
<1.17.16
>=1.18.2, <1.18.10
>=1.19.0, <1.19.4
1.17.16
1.18.10
1.19.4
bitnami cilium-operator
<1.17.16
>=1.18.2, <1.18.10
>=1.19.0, <1.19.4
1.17.16
1.18.10
1.19.4
bitnami hubble-relay
<1.17.16
>=1.18.2, <1.18.10
>=1.19.0, <1.19.4
1.17.16
1.18.10
1.19.4

Affected products

  • cilium cilium

Classification

Weakness
  • CWE-863 Incorrect Authorization
  • CWE-601 URL Redirection to Untrusted Site

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.