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    CVE-2026-42530

    NGINX Open Source has a vulnerability in the ngx_http_v3_module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream. This may cause a Use-after-Free in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

    Published:Jun 17, 2026
    Last Modified:Jun 18, 2026
    EPS:Jun 17, 2026
    EPSS Score:0.00755
    CVSS Score:8.1

    Affected Products

    Vendor
    F5
    Product
    Nginx Open Source

    Exploits

    https://github.com/0xBlackash/CVE-2026-42530https://github.com/HORKimhab/CVE-2026-42530https://github.com/v4ltonn/CVE-2026-42530

    Common Weakness Enumeration

    CWE-416 Use After Free

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    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-2026-42055 (CVSS 9.2) — NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_proxy_v2_module and ngx_http_grpc_module…
    CVE-2026-48142 (CVSS 6.3) — NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When content is s…
    CVE-2026-9256 (CVSS 9.2) — NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerabilit…
    CVE-2026-42926 (CVSS 6.3) — When NGINX Open Source is configured to proxy HTTP/2 traffic by setting proxy_http_version to 2, and also uses…
    CVE-2026-40460 (CVSS 6.9) — When NGINX Plus or NGINX Open Source are configured to use the HTTP/3 QUIC module, an attacker may be able to …
    CVE-2026-42934 (CVSS 6.3) — NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When charset, sou…
    CVE-2026-42946 (CVSS 8.3) — A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excess…

    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