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Vulnerabilities

Vulnerability · CVE-2026-104939

Description NGINX Ingress Controller has a vulnerability when implementing an externalAuth policy for ingress. NGINX Ingress Controller may mishandle the HTTP response from an OAut

Published Oct 14, 2026 · catalog updated Oct 15, 2026 · F5 NGINX Ingress Controller

Check if you run it

No confirmed exploitation is on record for CVE-2026-104939. EPSS is 0.36%. Act only if a listed version of F5 NGINX Ingress Controller is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.36%
Remediation
Not established
Affected products
vendor F5 NGINX Ingress Controller

Description NGINX Ingress Controller has a vulnerability when implementing an externalAuth policy for ingress. NGINX Ingress Controller may mishandle the HTTP response from an OAuth IdP and allow an attacker to acquire unauthenticated access to protected paths before the proper external authentication can happen. Impact This vulnerability may allow remote attackers unauthenticated access to protected paths. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor F5 NGINX Ingress Controllerversion unspecified

How to fix CVE-2026-104939

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-104939. EPSS is 0.36%. Act only if a listed version of F5 NGINX Ingress Controller is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-303. EPSS 0.36%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Nginx security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 14, 2026 · CIRCL Vulnerability Lookup

    Detected

    Description NGINX Ingress Controller has a vulnerability when implementing an externalAuth policy for ingress. NGINX Ingress Controller may mishandle the HTTP response from an OAuth IdP and allow an attacker to acquire unauthenticated access to protected paths before the proper external authentication can happen. Impact This vulnerability may allow remote attackers unauthenticated access to protec

  2. Oct 14, 2026 · NIST NVD

    Updated

    Description NGINX Ingress Controller has a vulnerability when implementing an externalAuth policy for ingress. NGINX Ingress Controller may mishandle the HTTP response from an OAuth IdP and allow an attacker to acquire unauthenticated access to protected paths before the proper external authentication can happen. Impact This vulnerability may allow remote attackers unauthenticated access to protec

  3. Oct 15, 2026 · NIST NVD

    Updated

    Description NGINX Ingress Controller has a vulnerability when implementing an externalAuth policy for ingress. NGINX Ingress Controller may mishandle the HTTP response from an OAuth IdP and allow an attacker to acquire unauthenticated access to protected paths before the proper external authentication can happen. Impact This vulnerability may allow remote attackers unauthenticated access to protec

Sources

  • Canadian Centre for Cyber SecurityGovernment advisoryCVE-2026-104939

    Serial number: AV26-1049 Date: October 15, 2026 As of October 14, 2026, F5 is affected by vulnerabilities in the following products: NGINX Gateway Fabric Prior to 2.8.0 NGINX Ingress Controller Prior to 5.7.0 NGINX JavaScript Prior to 1.0.2 NGINX Open Source Prior to 1.30.6 Prior

    cyber.gc.ca
  • CIRCL Vulnerability LookupVulnerability recordCVE-2026-104939

    Description NGINX Ingress Controller has a vulnerability when implementing an externalAuth policy for ingress. NGINX Ingress Controller may mishandle the HTTP response from an OAuth IdP and allow an attacker to acquire unauthenticated access to protected paths before the proper e

    vulnerability.circl.lu
  • CVE.orgVulnerability recordCVE-2026-104939

    Description NGINX Ingress Controller has a vulnerability when implementing an externalAuth policy for ingress. NGINX Ingress Controller may mishandle the HTTP response from an OAuth IdP and allow an attacker to acquire unauthenticated access to protected paths before the proper e

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-104939

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-104939

    Description NGINX Ingress Controller has a vulnerability when implementing an externalAuth policy for ingress. NGINX Ingress Controller may mishandle the HTTP response from an OAuth IdP and allow an attacker to acquire unauthenticated access to protected paths before the proper e

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.