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Vulnerabilities

Vulnerability · CVE-2026-90439

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_v3_module module.

Published Sep 15, 2026 · catalog updated Oct 22, 2026 · NGINX Plus and NGINX

Check if you run it

No confirmed exploitation is on record for CVE-2026-90439. EPSS is 0.26%. Act only if a listed version of NGINX Plus and NGINX is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (NGINX Plus and NGINX).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.26%
Remediation
Advisory link
Affected products
Alpine:v3.24 nginx

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_v3_module module. When using HTTP/3 with OpenSSL versions <= OpenSSL 3.5.0 under certain configurations, a limited heap buffer overflow could happen while processing a TLS handshake. This can happen in a non-deterministic manner that is beyond the attacker's control. This may cause a heap buffer overflow in the NGINX worker process leading to a restart and/or limited data corruption. Impact: This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or limited data corruption. 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.

  • Alpine:v3.24 nginx0 → 1.30.6-r0

How to fix CVE-2026-90439

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-2026-90439. EPSS is 0.26%. Act only if a listed version of NGINX Plus and NGINX is installed.

Which versions are affected?

Compare what you have installed with 0 → 1.30.6-r0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.26%. 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. Sep 15, 2026 · OpenSSF OSV / OSV Scanner

    Detected

    NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_v3_module module. When using HTTP/3 with OpenSSL versions <= OpenSSL 3.5.0 under certain configurations, a limited heap buffer overflow could happen while processing a TLS handshake. This can happen in a non-deterministic manner that is beyond the attacker's control. This may cause a heap buffer overflow in the NGINX worker proc

  2. Oct 22, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    nginx fixed in 1.30.6-r0

  3. Oct 22, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    nginx fixed in 1.30.6-r0

  4. Oct 22, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_v3_module module. When using HTTP/3 with OpenSSL versions <= OpenSSL 3.5.0 under certain configurations, a limited heap buffer overflow could happen while processing a TLS handshake. This can happen in a non-deterministic manner that is beyond the attacker's control. This may cause a heap buffer overflow in the NGINX worker proc

Sources

  • CVE.orgVulnerability recordCVE-2026-90439

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-90439

    30-day exploitation probability 0.26%

    first.org
  • OpenSSF OSV / OSV ScannerPackage advisoryALPINE-CVE-2026-90439
    osv.dev
  • Trivy Vulnerability DBPackage advisoryALPINE-CVE-2026-90439

    NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_v3_module module. When using HTTP/3 with OpenSSL versions <= OpenSSL 3.5.0 under certain configurations, a limited heap buffer overflow could happen while processing a TLS handshake. This can happen in a non-de

    osv.dev

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.