Description
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.
Metrics
CVSS 3.1 8.1/10
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| F5 | NGINX Open Source | >= 1.31.0, < 1.31.2 |
| Red Hat | Red Hat Hardened Images | — |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 8 | — |
| Red Hat | Red Hat Enterprise Linux 8 | — |
| Red Hat | Red Hat Enterprise Linux 9 | — |
| Red Hat | Red Hat Enterprise Linux 9 | — |
| Red Hat | Red Hat Enterprise Linux 9 | — |
| Red Hat | Red Hat Lightspeed proxy 1 | — |
References
- https://my.f5.com/manage/s/article/K000161616Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:20351
- https://access.redhat.com/security/cve/CVE-2026-42530Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2489872Third Party Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42530.jsonThird Party Advisory
Timeline
- Published
- Jun 17, 2026
- Last modified
- Oct 26, 2026
- NVD status
- Modified