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ALSA-2026:18029 — Critical: nginx security update

Affected: AlmaLinux:9: nginx, AlmaLinux:9: nginx-all-modules, AlmaLinux:9: nginx-core, AlmaLinux:9: nginx-filesystem, AlmaLinux:9: nginx-mod-devel, AlmaLinux:9: nginx-mod-http-image-filter, AlmaLinux:9: nginx-mod-http-perl, AlmaLinux:9: nginx-mod-http-xslt-filter, AlmaLinux:9: nginx-mod-mail, AlmaLinux:9: nginx-mod-stream

nginx is a web and proxy server supporting HTTP and other protocols, with a focus on high concurrency, performance, and low memory usage.

Security Fix(es):

* nginx: NGINX: Arbitrary Code Execution Vulnerability (CVE-2026-42945)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

bdu:2026-06827

BELL-CVE-2026-42945

Affected: Alpaquita:23: nginx, Alpaquita:25: nginx, Alpaquita:stream: nginx

BIT-nginx-2026-42945 — NGINX ngx_http_rewrite_module vulnerability

Affected: Bitnami: nginx

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when the rewrite directive is followed by a rewrite, if, or set directive and an unnamed Perl-Compatible Regular Expression (PCRE) capture (for example, $1, $2) with a replacement string that includes a question mark (?). An unauthenticated attacker along with conditions beyond its control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow 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.

certfr-2026-avi-0591 — De multiples vulnérabilités ont été découvertes dans les produits F5. Certaines d'entre elles permettent à un attaquant…

certfr-2026-avi-0591

EUVD-2026-366082

fkie_cve-2026-42945

GHSA-gcgv-v5gf-c543

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when the rewrite directive is followed by a rewrite, if, or set directive and an unnamed Perl-Compatible Regular Expression (PCRE) capture (for example, $1, $2) with a replacement string that includes a question mark (?). An unauthenticated attacker along with conditions beyond its control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, for systems with Address Space Layout Randomization (ASLR ) disabled, code execution is possible. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

ICSA-26-188-03 — Hitachi Energy e-mesh EMS

Hitachi Energy is aware of a buffer overflow vulnerability that affects e-mesh EMS product versions listed in this document. Successful exploitation of this vulnerability could lead to a buffer overflow condition, potentially resulting in application outages (denial of service) and possible arbitrary code execution. Please refer to the Recommended Immediate Actions for information about the mitigation/remediation.

msrc_CVE-2026-42945 — NGINX ngx_http_rewrite_module vulnerability

msrc_CVE-2026-42945

NCSC-2026-0164 — Kwetsbaarheid verholpen in NGINX ngx_http_rewrite_module

NCSC-2026-0164

OESA-2026-2405 — nginx security update

Affected: openEuler:20.03-LTS-SP4: nginx

NGINX is a free, open-source, high-performance HTTP server and reverse proxy, as well as an IMAP/POP3 proxy server. Security Fix(es):

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when the rewrite directive is followed by a rewrite, if, or set directive and an unnamed Perl-Compatible Regular Expression (PCRE) capture (for example, $1, $2) with a replacement string that includes a question mark (?). An unauthenticated attacker along with conditions beyond its control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, for systems with Address Space Layout Randomization (ASLR ) disabled, code execution is possible. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-42945)

openSUSE-SU-2026:10796-1 — nginx-1.31.0-1.1 on GA media

nginx-1.31.0-1.1 on GA media

RHSA-2026:17417 — Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

nginx: NGINX: Arbitrary Code Execution Vulnerability

RLSA-2026:19159 — Critical: nginx security update

Affected: Rocky Linux:10: nginx

nginx is a web and proxy server supporting HTTP and other protocols, with a focus on high concurrency, performance, and low memory usage.

Security Fix(es):

* nginx: NGINX: Arbitrary Code Execution Vulnerability (CVE-2026-42945)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

SUSE-SU-2026:21832-1 — Security update for nginx

Security update for nginx

UBUNTU-CVE-2026-42945

Affected: Ubuntu:Pro:14.04:LTS: nginx, Ubuntu:Pro:16.04:LTS: nginx, Ubuntu:Pro:18.04:LTS: nginx, Ubuntu:Pro:20.04:LTS: nginx, Ubuntu:22.04:LTS: nginx, Ubuntu:24.04:LTS: nginx, Ubuntu:25.10: nginx, Ubuntu:26.04:LTS: nginx

WID-SEC-W-2026-1527 — NGINX Open Source and NGINX Plus: Mehrere Schwachstellen

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in NGINX Open Source and NGINX Plus ausnutzen, um Sicherheitsvorkehrungen zu umgehen, beliebigen Code auszuführen, Daten zu manipulieren, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand zu verursachen.