by Kastro CVE-2026-42530
F5 NGINX Open Source — NGINX Open-Source ngx_http_v3_module vulnerability
Description · from the CVE record
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.
Affected
ProductAffectedFixed inSource
NGINX Open Source1.31.0 – < 1.31.21.31.2CNA
Red Hat Hardened Imagessee advisory1.30.2-1.hum1redhat-SADP
Red Hat Enterprise Linux 10see advisory–redhat-SADP
Red Hat Enterprise Linux 8see advisory–redhat-SADP
Red Hat Enterprise Linux 8see advisory–redhat-SADP
Red Hat Enterprise Linux 9see advisory–redhat-SADP
Red Hat Enterprise Linux 9see advisory–redhat-SADP
Red Hat Enterprise Linux 9see advisory–redhat-SADP
Red Hat Lightspeed proxy 1see advisory–redhat-SADP
Scores by source
f5 (CNA)9.2CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
f5 (CNA)8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
redhat-SADP (CNA)8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total