Vulnerability Intelligence Report
NGINX Open-Source ngx_http_v3_module vulnerability
CVE-2026-42530
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.
No Active Exploit Signals
CVSS Base Score
8.1
HIGH
Exploitability:2.3
Impact Score:5.9
EPSS Probability:3.23%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-416 ↗CWE-416 Use After Free
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| F5 | NGINX Open Source | 1.31.0 < 1.31.2 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
3.225%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | F5, Inc. · Vendor · USA |
| Reserved | 2026-06-02T21:45:04 |
| Published | 2026-06-17T14:04:32 |
| Patch Date | 2026-06-17 |
| Last Updated | 2026-07-16T12:04:40 |
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