CVE-2026-42530
Last modified
CVE-2026-42530 is a critical-severity vulnerability rated 9.2/10 on the CVSS scale. 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. EPSS estimates a 3.23% chance of exploitation in the next 30 days.
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/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| F5 | Nginx Gateway Fabric | >= 1.3.0, <= 1.6.2 |
| F5 | Nginx Gateway Fabric | >= 2.0.0, < 2.6.4 |
| F5 | Nginx Ingress Controller | >= 3.5.0, <= 3.7.2 |
| F5 | Nginx Ingress Controller | >= 5.0.0, < 5.5.1 |
| F5 | Nginx Ingress Controller | 4.0.0 |
| F5 | Nginx Ingress Controller | 4.0.1 |
| F5 | Nginx Instance Manager | >= 2.17.0, <= 2.22.0 |
| F5 | Nginx Open Source | >= 1.31.0, < 1.31.2 |
References
- https://my.f5.com/manage/s/article/K000161616Vendor Advisory
- 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
- Last Modified
- Status
- Modified
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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