Bug 2489872 (CVE-2026-42530) - CVE-2026-42530 nginx: ngx_http_v3_module: use-after-free issue leads to denial of service
Summary: CVE-2026-42530 nginx: ngx_http_v3_module: use-after-free issue leads to denia...
Keywords:
Status: NEW
Alias: CVE-2026-42530
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-17 16:02 UTC by OSIDB Bzimport
Modified: 2026-06-18 16:41 UTC (History)
3 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-06-17 16:02:29 UTC 
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.
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