RHSA-2026:98529 - Security Advisory

Topic

An update for nginx is now available for Red Hat Enterprise Linux 9.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

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: Denial of Service or file modification via buffer overflow in ngx_http_dav_module (CVE-2026-27654)
• NGINX: NGINX: Denial of Service due to memory corruption via crafted MP4 file (CVE-2026-27784)
• NGINX: NGINX: Denial of Service via undisclosed requests when ngx_mail_auth_http_module is enabled (CVE-2026-27651)
• nginx: nginx: heap-based buffer overflow in ngx_http_core_module via alias with rewrite referencing $request_filename (CVE-2026-15176)
• nginx: NGINX ngx_http_core_module vulnerability (CVE-2026-97205)

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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 9 x86_64
• Red Hat Enterprise Linux for IBM z Systems 9 s390x
• Red Hat Enterprise Linux for Power, little endian 9 ppc64le
• Red Hat Enterprise Linux for ARM 64 9 aarch64
• Red Hat CodeReady Linux Builder for x86_64 9 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian 9 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 9 aarch64
• Red Hat CodeReady Linux Builder for IBM z Systems 9 s390x

Fixes

• BZ - 2450776 - CVE-2026-27654 NGINX: NGINX: Denial of Service or file modification via buffer overflow in ngx_http_dav_module
• BZ - 2450785 - CVE-2026-27784 NGINX: NGINX: Denial of Service due to memory corruption via crafted MP4 file
• BZ - 2450791 - CVE-2026-27651 NGINX: NGINX: Denial of Service via undisclosed requests when ngx_mail_auth_http_module is enabled
• BZ - 2552352 - CVE-2026-15176 nginx: nginx: heap-based buffer overflow in ngx_http_core_module via alias with rewrite referencing $request_filename
• BZ - 2552359 - CVE-2026-97205 nginx: NGINX ngx_http_core_module vulnerability

CVEs

• CVE-2026-15176
• CVE-2026-27651
• CVE-2026-27654
• CVE-2026-27784
• CVE-2026-97205

References

• https://access.redhat.com/security/updates/classification/#important