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    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-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.

    Published:Sep 15, 2026
    Last Modified:Sep 18, 2026
    EPS:Sep 15, 2026
    EPSS Score:0.00256
    CVSS Score:6.5

    Affected Products

    Vendor
    F5
    Product
    Nginx Open Source
    Vendor
    F5
    Product
    Nginx Plus
    Vendor
    Redhat
    Product
    Hummingbird

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

    CVE-2026-95101 (CVSS 6.9) — Description NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_v3_module module. When using…
    CVE-2026-93479 (CVSS 9.2) — A vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and the ro…
    CVE-2026-97205 (CVSS 9.2) — NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_core_module module. When asynchronous fi…
    CVE-2026-97629 (CVSS 8.3) — Description When NGINX Plus or NGINX Open Source is configured with ssl_session_cache shared:name:size with…
    CVE-2026-15176 (CVSS 9.2) — A vulnerability exists in NGINX Plus and NGINX Open Source when a location is configured that uses the alias d…
    CVE-2026-60005 (CVSS 8.8) — NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_slice_module module. When the slice dire…
    CVE-2026-56434 (CVSS 8.3) — NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssi_module module. This vulnerability ma…
    CVE-2026-42533 (CVSS 9.2) — A vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and a stri…
    CVE-2026-42530 (CVSS 9.2) — NGINX Open Source has a vulnerability in the ngx_http_v3_module module. When NGINX Open Source is configured t…
    CVE-2026-42055 (CVSS 9.2) — NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_proxy_v2_module and ngx_http_grpc_module…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High