CVE-2026-53935

MEDIUMPre-NVD 6.96.9
EchelonGraph scoreLOW confidence

This medium-severity CVE scores 6.9 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: cna:github_m
6.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: —CVSS: 6.9Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

Impact

Users with the ability to create CiliumLocalRedirectPolicies can specify arbitrary ClusterIPs via addressMatcher, which enables hijacking traffic to Services in any namespace, bypassing the namespace-scoping guarantees enforced by serviceMatcher.

In addition, deleting such a policy can corrupt Cilium's internal service state, causing service translation to stop working entirely for the affected Service.

Patches

This issue affects:

  • Cilium v1.19.0 to v1.19.3 inclusive (fixed in PR #45584)
  • Cilium v1.18.2 to v1.18.9 inclusive (fixed in PR #45585)
  • All versions of Cilium prior to v1.17.16 (fixed in PR #45412)

This issue has been patched in:

  • Cilium v1.19.4
  • Cilium v1.18.10
  • Cilium v1.17.16

Workarounds

There is no workaround to this issue.

Acknowledgements

The Cilium community has worked together with members of Isovalent to prepare these mitigations. Special thanks to @ysksuzuki for investigating and fixing the issue.

For more information

If there are any questions or comments about this advisory, please reach out on Slack.

To report potential vulnerabilities affecting Cilium, it strongly is encouraged to report them through the security mailing list at [email protected]. This is a private mailing list for the Cilium security team, and reports will be treated as a top priority.

CVSS v3
6.9
EG Score
6.9(low)
EPSS
—
KEV
Not listed

Published

July 6, 2026

Last Modified

July 6, 2026

Vendor Advisories for CVE-2026-53935(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 1× in last 7d / 1× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 21:36 UTCEG score recompute

Frequently asked(4)

What is CVE-2026-53935?
CVE-2026-53935 is a medium vulnerability published on July 6, 2026. CiliumLocalRedirectPolicy addressMatcher allows cross-namespace service traffic hijacking and can break service translation Impact Users with the ability to create CiliumLocalRedirectPolicies can specify arbitrary ClusterIPs via addressMatcher, which enables hijacking traffic to Services in any…
When was CVE-2026-53935 disclosed?
CVE-2026-53935 was first published in the National Vulnerability Database on July 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-53935?
CVE-2026-53935 has a CVSS v4.0 base score of 6.9 (CNA self-assessment; NVD's own analysis pending). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-53935?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53935, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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