Back to overview

CVE-2026-42530

HIGH
8.1
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-42530
State
PUBLISHED
Assigner
f5
Reserved
2026-06-02 21:45 UTC
Published
2026-06-17 14:04 UTC
Last updated
2026-06-17 15:43 UTC
Primary CWE
CWE-416
CWE-416 Use After Free
Vendor / Product
F5 / NGINX Open Source
Sources
cve.org  ·  NVD

Severity & Metrics

8.1 HIGH CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
total
Affected products (1)
VendorProductPlatformVersions
F5 NGINX Open Source — 1.31.0 < 1.31.2
Weakness (CWE)
CWESourceDescription
CWE-416 cna CWE-416 Use After Free
CVSS scores (2)
ScoreSeverityVersionSourceVector
9.2 CRITICAL 4.0 cna 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
8.1 HIGH 3.1 cna CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
References (1)
Back to overview