CVE-2026-42530NGINX Open Source has a vulnerability in the ngx_http_v3_module module.
Updated under an hour ago ()
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It affects f5 nginx_gateway_fabric and 3 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.1 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-416
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Jul 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
f5 nginx_gateway_fabric f5:nginx_gateway_fabric | from 1.3.0 through 1.6.2; from 2.0.0 before 2.6.4 | NVD |
f5 nginx_ingress_controller f5:nginx_ingress_controller | from 3.5.0 through 3.7.2; from 5.0.0 before 5.5.1; 4.0.0; 4.0.1 | NVD |
f5 nginx_instance_manager f5:nginx_instance_manager | from 2.17.0 through 2.22.0 | NVD |
f5 nginx_open_source f5:nginx_open_source | from 1.31.0 before 1.31.2 | NVD |
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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.