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CVE

CVE-2026-42530

NGINX Open Source has a vulnerability in the ngx_http_v3_module module.
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CVE

CVE-2026-42530

NGINX Open Source has a vulnerability in the ngx_http_v3_module module.

NGINX Open Source has a vulnerability in the ngxhttpv3_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.  

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Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Package Versions Affected

Package Version
patch Availability
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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.2
-
4.0
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
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://access.redhat.com/errata/RHSA-2026:20351, https://access.redhat.com/security/cve/CVE-2026-42530, https://bugzilla.redhat.com/show_bug.cgi?id=2489872, https://my.f5.com/manage/s/article/K000161616, https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42530.json

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.03677%
EPSS Percentile
0.88804%
Introduced Version
e8053c867f9ab14f323e3019ccab585d857abb66,7dad8b31e3f0c3eadce36fed8c276e83e6583d24,0
Fix Available
2fd01ed47a1fd2965754c83f53b33a789d0e07f1,66691213cd771fe56b124786ea6701c7fb8e467a,1.31.2-r0

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