CVE-2026-32647

NGINX Open Source and NGINX Plus have a vulnerability in the ngx_http_mp4_module module, which might allow an attacker to trigger a buffer over-read or over-write to the NGINX worker memory resulting in its termination or possibly code execution, using a specially crafted MP4 file. This issue affects NGINX Open Source and NGINX Plus if it is built with the ngx_http_mp4_module module and the mp4 directive is used in the configuration file. Additionally, the attack is possible only if an attacker can trigger the processing of a specially crafted MP4 file with the ngx_http_mp4_module module.

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

NGINX Open Source and NGINX Plus have a vulnerability in the ngx_http_mp4_module module, which might allow an attacker to trigger a buffer over-read or over-write to the NGINX worker memory resulting in its termination or possibly code execution, using a specially crafted MP4 file. This issue affects NGINX Open Source and NGINX Plus if it is built with the ngx_http_mp4_module module and the mp4 directive is used in the configuration file. Additionally, the attack is possible only if an attacker can trigger the processing of a specially crafted MP4 file with the ngx_http_mp4_module module. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

NGINX is a free, open-source, high-performance HTTP server and reverse proxy, as well as an IMAP/POP3 proxy server.

Security Fix(es):

When the ngx_mail_auth_http_module module is enabled on NGINX Plus or NGINX Open Source, undisclosed requests can cause worker processes to terminate. This issue may occur when (1) CRAM-MD5 or APOP authentication is enabled, and (2) the authentication server permits retry by returning the Auth-Wait response header. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-27651)

NGINX Open Source and NGINX Plus have a vulnerability in the ngx_http_dav_module module that might allow an attacker to trigger a buffer overflow to the NGINX worker process; this vulnerability may result in termination of the NGINX worker process or modification of source or destination file names outside the document root. This issue affects NGINX Open Source and NGINX Plus when the configuration file uses DAV module MOVE or COPY methods, prefix location (nonregular expression location configuration), and alias directives. The integrity impact is constrained because the NGINX worker process user has low privileges and does not have access to the entire system. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-27654)

The 32-bit implementation of NGINX Open Source has a vulnerability in the ngx_http_mp4_module module, which might allow an attacker to over-read or over-write NGINX worker memory resulting in its termination, using a specially crafted MP4 file. The issue only affects 32-bit NGINX Open Source if it is built with the ngx_http_mp4_module module and the mp4 directive is used in the configuration file. Additionally, the attack is possible only if an attacker can trigger the processing of a specially crafted MP4 file with the ngx_http_mp4_module module.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-27784)

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_mail_smtp_module module due to the improper handling of CRLF sequences in DNS responses. This allows an attacker-controlled DNS server to inject arbitrary headers into SMTP upstream requests, leading to potential request manipulation. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-28753)

NGINX Open Source and NGINX Plus have a vulnerability in the ngx_http_mp4_module module, which might allow an attacker to trigger a buffer over-read or over-write to the NGINX worker memory resulting in its termination or possibly code execution, using a specially crafted MP4 file. This issue affects NGINX Open Source and NGINX Plus if it is built with the ngx_http_mp4_module module and the mp4 directive is used in the configuration file. Additionally, the attack is possible only if an attacker can trigger the processing of a specially crafted MP4 file with the ngx_http_mp4_module module.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-32647)

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 Code Execution via specially crafted MP4 files (CVE-2026-32647)

• 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)

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.

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 Code Execution via specially crafted MP4 files (CVE-2026-32647)

• 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)

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.

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 Code Execution via specially crafted MP4 files (CVE-2026-32647)

• 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)

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.

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 Code Execution via specially crafted MP4 files (CVE-2026-32647)

• 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)

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.

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 Code Execution via specially crafted MP4 files (CVE-2026-32647)

• 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)

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.

NGINX Open Source and NGINX Plus have a vulnerability in the ngx_http_mp4_module module, which might allow an attacker to trigger a buffer over-read or over-write to the NGINX worker memory resulting in its termination or possibly code execution, using a specially crafted MP4 file. This issue affects NGINX Open Source and NGINX Plus if it is built with the ngx_http_mp4_module module and the mp4 directive is used in the configuration file. Additionally, the attack is possible only if an attacker can trigger the processing of a specially crafted MP4 file with the ngx_http_mp4_module module. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

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 Code Execution via specially crafted MP4 files (CVE-2026-32647)
• 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)

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.

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 Code Execution via specially crafted MP4 files (CVE-2026-32647)
• 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)

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.

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 Code Execution via specially crafted MP4 files (CVE-2026-32647)
• 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)

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.

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 Code Execution via specially crafted MP4 files (CVE-2026-32647)
• 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)

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.

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 Code Execution via specially crafted MP4 files (CVE-2026-32647)
• 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)

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.

NGINX Open Source and NGINX Plus have a vulnerability in the ngx_http_mp4_module module, which might allow an attacker to trigger a buffer over-read or over-write to the NGINX worker memory resulting in its termination or possibly code execution, using a specially crafted MP4 file. This issue affects NGINX Open Source and NGINX Plus if it is built with the ngx_http_mp4_module module and the mp4 directive is used in the configuration file. Additionally, the attack is possible only if an attacker can trigger the processing of a specially crafted MP4 file with the ngx_http_mp4_module module.

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

NGINX Open Source and NGINX Plus have a vulnerability in the ngx_http_mp4_module module, which might allow an attacker to trigger a buffer over-read or over-write to the NGINX worker memory resulting in its termination or possibly code execution, using a specially crafted MP4 file. This issue affects NGINX Open Source and NGINX Plus if it is built with the ngx_http_mp4_module module and the mp4 directive is used in the configuration file. Additionally, the attack is possible only if an attacker can trigger the processing of a specially crafted MP4 file with the ngx_http_mp4_module module.

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

NGINX Open Source and NGINX Plus have a vulnerability in the ngx_http_mp4_module module, which might allow an attacker to trigger a buffer over-read or over-write to the NGINX worker memory resulting in its termination or possibly code execution, using a specially crafted MP4 file. This issue affects NGINX Open Source and NGINX Plus if it is built with the ngx_http_mp4_module module and the mp4 directive is used in the configuration file. Additionally, the attack is possible only if an attacker can trigger the processing of a specially crafted MP4 file with the ngx_http_mp4_module module.

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

• CVE-2026-27651: fix null pointer dereference in ngx_mail_auth_http_module when clearing password in auth http requests with CRAM-MD5/APOP
• CVE-2026-27654: fix heap buffer overflow in DAV module when COPY/MOVE destination URI is shorter than alias
• CVE-2026-32647: fix buffer over-read/over-write in mp4 module when processing empty stco and co64 atoms

• CVE-2026-32647: fix buffer over-read/over-write in ngx_http_mp4_module via integer overflow, off-by-one boundary checks, and zero sync sample validation in stss atom
• CVE-2026-27651: fix NULL pointer dereference in ngx_mail_auth_http_module when using CRAM-MD5 or APOP authentication with Auth-Wait response

• CVE-2026-27651: fix null pointer dereference in ngx_mail_auth_http_module when authentication retry is enabled with CRAM-MD5 or APOP
• CVE-2026-32647: fix buffer over-read/write in ngx_http_mp4_module when processing crafted mp4 files with empty stco/co64 atoms

• CVE-2026-27651: fix null pointer dereference in ngx_mail_auth_http_module when authentication retry is enabled with CRAM-MD5 or APOP
• CVE-2026-32647: fix buffer over-read/write in ngx_http_mp4_module when processing crafted mp4 files with empty stco/co64 atoms

• CVE-2026-27651: fix null pointer dereference in ngx_mail_auth_http_module when authentication retry is enabled with CRAM-MD5 or APOP
• CVE-2026-32647: fix buffer over-read/write in ngx_http_mp4_module when processing crafted mp4 files with empty stco/co64 atoms

• SECURITY UPDATE: detect premature plain text response from SSL upstream (TLS plaintext injection)
  • debian/patches/CVE-2026-1642.patch: detect premature plain text response from SSL upstream (TLS plaintext injection)
  • CVE-2026-1642
• SECURITY UPDATE: fix NULL pointer dereference clearing s->passwd in mail auth http requests
  • debian/patches/CVE-2026-27651.patch: fix NULL pointer dereference clearing s->passwd in mail auth http requests
  • CVE-2026-27651
• SECURITY UPDATE: destination length validation for WebDAV COPY and MOVE (heap buffer overflow)
  • debian/patches/CVE-2026-27654.patch: destination length validation for WebDAV COPY and MOVE (heap buffer overflow)
  • CVE-2026-27654
• SECURITY UPDATE: fix integer overflow on 32-bit platforms in ngx_http_mp4_module
  • debian/patches/CVE-2026-27784.patch: fix integer overflow on 32-bit platforms in ngx_http_mp4_module
  • CVE-2026-27784
• SECURITY UPDATE: avoid zero size buffers in ngx_http_mp4_module output (out-of-bounds access)
  • debian/patches/CVE-2026-32647.patch: avoid zero size buffers in ngx_http_mp4_module output (out-of-bounds access)
  • CVE-2026-32647
• SECURITY UPDATE: reject unsafe characters in URIs and headers set via the Lua API (HTTP response splitting)
  • debian/modules/nginx-lua/src/ngx_http_lua_util.c, debian/modules/nginx-lua/src/ngx_http_lua_util.h, debian/modules/nginx-lua/src/ngx_http_lua_uri.c, debian/modules/nginx-lua/src/ngx_http_lua_headers_in.c, debian/modules/nginx-lua/src/ngx_http_lua_headers_out.c, debian/modules/nginx-lua/src/ngx_http_lua_control.c: validate arguments of the Lua APIs that mutate a URI or a request/response header so control characters raise an error instead of being silently truncated.
  • CVE-2020-36309

• SECURITY UPDATE: detect premature plain text response from SSL upstream (TLS plaintext injection)
  • debian/patches/CVE-2026-1642.patch: detect premature plain text response from SSL upstream (TLS plaintext injection)
  • CVE-2026-1642
• SECURITY UPDATE: fix NULL pointer dereference clearing s->passwd in mail auth http requests
  • debian/patches/CVE-2026-27651.patch: fix NULL pointer dereference clearing s->passwd in mail auth http requests
  • CVE-2026-27651
• SECURITY UPDATE: destination length validation for WebDAV COPY and MOVE (heap buffer overflow)
  • debian/patches/CVE-2026-27654.patch: destination length validation for WebDAV COPY and MOVE (heap buffer overflow)
  • CVE-2026-27654
• SECURITY UPDATE: fix integer overflow on 32-bit platforms in ngx_http_mp4_module
  • debian/patches/CVE-2026-27784.patch: fix integer overflow on 32-bit platforms in ngx_http_mp4_module
  • CVE-2026-27784
• SECURITY UPDATE: avoid zero size buffers in ngx_http_mp4_module output (out-of-bounds access)
  • debian/patches/CVE-2026-32647.patch: avoid zero size buffers in ngx_http_mp4_module output (out-of-bounds access)
  • CVE-2026-32647

• CVE-2026-32647: fix buffer over-read/over-write in ngx_http_mp4_module when processing empty stco/co64 atoms and reject zero size output buffers

• CVE-2026-32647: fix buffer over-read/over-write in ngx_http_mp4_module when processing empty stco/co64 atoms and reject zero size output buffers

• CVE-2026-32647: fix buffer over-read/over-write in ngx_http_mp4_module when processing empty stco/co64 atoms and reject zero size output buffers

Buffer overflow in ngx_http_dav_module (CVE-2026-27654) Buffer overflow in the ngx_http_mp4_module (CVE-2026-27784) Buffer overflow in the ngx_http_mp4_module (CVE-2026-32647) NULL pointer dereference while using CRAM-MD5 or APOP (CVE-2026-27651) Injection in auth_http and XCLIENT (CVE-2026-28753) OCSP result bypass in stream (CVE-2026-28755)

These are all security issues fixed in the nginx-1.29.7-1.1 package on the GA media of openSUSE Tumbleweed.

This update for nginx fixes the following issues

• CVE-2026-27651: denial of service via undisclosed requests when the ngx_mail_auth_http_module is enabled (bsc#1260415).
• CVE-2026-32647: NGINX worker memory over-read or over-write via a specially crafted MP4 file (bsc#1260420).
• CVE-2026-40701: heap use-after-free in the worker process when the ssl_verify_client and the ssl_ocsp directives are set due to issue in the ngx_http_ssl_module module (bsc#1265229).
• CVE-2026-42934: heap buffer overread in the worker process due to issue in the ngx_http_charset_module module (bsc#1265231).
• CVE-2026-42945: heap buffer overflow via crafted HTTP requests due to issue in ngx_http_rewrite_module (bsc#1265232).
• CVE-2026-42946: excessive memory allocation and data overread due to issue in the ngx_http_scgi_module and ngx_http_uwsgi_module modules (bsc#1265233).

Root has patched CVE-2026-32647 in the nginx package for Root:Alpine:3.15. Multiple fixed versions available.

Root has patched CVE-2026-32647 in the nginx package for Root:Alpine:3.20. Multiple fixed versions available.

Root has patched CVE-2026-32647 in the nginx package for Root:Alpine:3.21. Multiple fixed versions available.

Root has patched CVE-2026-32647 in the nginx package for Root:Debian:12. Multiple fixed versions available.