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TI-2026-38905 Aliases CVE-2026-53935GHSA-q6h5-q3q6-f87x

Incorrect authorization in cilium

Priority LOW 30CWE-863Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Security bypass, Spoofing
Confidentiality · integrity · availability
Low · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-863 and CWE-601.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0034 27th percentileScored 2026-11-07
Fix Fixed cilium (cilium): 1.17.16, 1.18.10, 1.19.4github.com/cilium/cilium (Go): 1.19.4, 1.18.10, 1.17.16

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ciliumciliumbefore 1.17.16; 1.18.2 to before 1.18.10; 1.19.0 to before 1.19.41.17.16, 1.18.10, 1.19.4Patch availableCNA
—github.com/cilium/cilium (Go)1.19.0 to before 1.19.41.19.4Patch availableGHSA-q6h5-q3q6-f87x
—github.com/cilium/cilium (Go)1.18.2 to before 1.18.101.18.10Patch availableGHSA-q6h5-q3q6-f87x
—github.com/cilium/cilium (Go)before 1.17.161.17.16Patch availableGHSA-q6h5-q3q6-f87x
  • cilium Vendorcilium Affected before 1.17.16; 1.18.2 to before 1.18.10; 1.19.0 to before 1.19.4 Fixed in 1.17.16, 1.18.10, 1.19.4 Patch available CNA
  • github.com/cilium/cilium (Go) Vendor— Affected 1.19.0 to before 1.19.4 Fixed in 1.19.4 Patch available GHSA-q6h5-q3q6-f87x
  • github.com/cilium/cilium (Go) Vendor— Affected 1.18.2 to before 1.18.10 Fixed in 1.18.10 Patch available GHSA-q6h5-q3q6-f87x
  • github.com/cilium/cilium (Go) Vendor— Affected before 1.17.16 Fixed in 1.17.16 Patch available GHSA-q6h5-q3q6-f87x

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:*——cilium
  • cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:* Versions — — ·cilium

Remediation

  • Fix · CNA cilium (cilium) Fixed in 1.17.16, 1.18.10, 1.19.4
  • Fix · GHSA-q6h5-q3q6-f87x github.com/cilium/cilium (Go) Fixed in 1.19.4 Advisory →
  • Fix · GHSA-q6h5-q3q6-f87x github.com/cilium/cilium (Go) Fixed in 1.18.10 Advisory →
  • Fix · GHSA-q6h5-q3q6-f87x github.com/cilium/cilium (Go) Fixed in 1.17.16 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-53935
  2. 2026-10-03 Alias added: GHSA-q6h5-q3q6-f87x

References

Other 11

  • TI-2024-32092 CIDR deny policies may not take effect when a more narrow CIDR allow is present CVSS 3.1HIGH 8.7
  • TI-2026-09219 cilium ebpf LoadCollectionSpec/LoadCollectionSpecFromReader btf.go loadRawSpec integer overflow CVSS 4.0MEDIUM 4.8
  • TI-2023-12305 Cilium eBPF filters may be temporarily removed during agent restart CVSS 3.1CRITICAL 9.8
  • TI-2023-20486 Cilium NetworkPolicy bypass via pod labels CVSS 3.1CRITICAL 9.0
  • TI-2022-11721 Incorrect Default Permissions in Cilium CVSS 3.1HIGH 8.8
  • TI-2026-36600 Cilium: Sensitive information disclosure and cluster disruption via local Envoy admin socket access CVSS 3.1CRITICAL 9.2
See all 39 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences