NGINX Open-Source ngx_http_v3_module vulnerability
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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-42530US | — | Exploit | ||
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… | ||||
references
External citations — patches, advisories, analysis.
- https://access.redhat.com/errata/RHSA-2026:20351WEB
- https://access.redhat.com/security/cve/CVE-2026-42530ADVISORY
- https://bugzilla.redhat.com/show_bug.cgi?id=2489872ADVISORY
- https://my.f5.com/manage/s/article/K000161616ADVISORY
- https://nvd.nist.gov/vuln/detail/CVE-2026-42530WEB
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42530.jsonADVISORY
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