CVE-2026-27784

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.

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.

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.

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.

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.

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.

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.

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: fix integer overflow in mp4 module atom entry validation on 32-bit platforms

• CVE-2026-27784: fix possible integer overflow on 32-bit platforms in ngx_http_mp4_module

• 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-2026-27651: fix null pointer dereference in ngx_mail_auth_http_module when clearing the password in auth http requests with CRAM-MD5/APOP
• CVE-2026-27654: fix heap buffer overflow in ngx_http_dav_module when a COPY/MOVE destination URI is shorter than the location alias
• CVE-2026-27654: also require the COPY/MOVE Destination to match the aliased location prefix, and tighten ngx_http_map_uri_to_path() accordingly
• CVE-2026-27784: fix integer overflow in ngx_http_mp4_module atom entry count validation on 32-bit platforms

• CVE-2026-27651: fix null pointer dereference in ngx_mail_auth_http_module when clearing the password in auth http requests with CRAM-MD5/APOP
• CVE-2026-27654: fix heap buffer overflow in ngx_http_dav_module when a COPY/MOVE destination URI is shorter than the location alias
• CVE-2026-27654: also require the COPY/MOVE Destination to match the aliased location prefix, and tighten ngx_http_map_uri_to_path() accordingly
• CVE-2026-27784: fix integer overflow in ngx_http_mp4_module atom entry count validation on 32-bit platforms

• CVE-2026-27651: fix null pointer dereference in ngx_mail_auth_http_module when clearing the password in auth http requests with CRAM-MD5/APOP
• CVE-2026-27654: fix heap buffer overflow in ngx_http_dav_module when a COPY/MOVE destination URI is shorter than the location alias
• CVE-2026-27654: also require the COPY/MOVE Destination to match the aliased location prefix, and tighten ngx_http_map_uri_to_path() accordingly
• CVE-2026-27784: fix integer overflow in ngx_http_mp4_module atom entry count validation on 32-bit platforms

• CVE-2026-27651: properly clear s->passwd in mail auth http requests to fix a null pointer dereference on CRAM-MD5/APOP retry
• CVE-2026-27654: validate the Destination length for Dav COPY and MOVE to prevent an integer underflow and heap buffer overwrite when alias is used
• CVE-2026-27654: also require the COPY/MOVE Destination to match the aliased location prefix, and tighten ngx_http_map_uri_to_path() accordingly
• CVE-2026-27784: fix a possible integer overflow on 32-bit platforms while validating mp4 atom entry counts

• CVE-2026-27651: properly clear s->passwd in mail auth http requests to fix a null pointer dereference on CRAM-MD5/APOP retry
• CVE-2026-27654: validate the Destination length for Dav COPY and MOVE to prevent an integer underflow and heap buffer overwrite when alias is used
• CVE-2026-27654: also require the COPY/MOVE Destination to match the aliased location prefix, and tighten ngx_http_map_uri_to_path() accordingly
• CVE-2026-27784: fix a possible integer overflow on 32-bit platforms while validating mp4 atom entry counts

• SECURITY UPDATE: NULL pointer dereference in ngx_mail_auth_http_module when a CRAM-MD5 or APOP authentication attempt is retried
  • debian/patches/CVE-2026-27651.patch: clear s->passwd with ngx_str_null() in ngx_mail_auth_http_create_request, so the stale length no longer survives into the next auth attempt and terminates the worker process
  • CVE-2026-27651
• SECURITY UPDATE: heap buffer overflow in ngx_http_dav_module on COPY and MOVE inside an aliased prefix location
  • debian/patches/CVE-2026-27654.patch: reject a Destination URI shorter than clcf->alias in ngx_http_dav_copy_move_handler, so the integer underflow in ngx_http_map_uri_to_path can no longer overwrite the heap or move files outside the location root
  • debian/patches/CVE-2026-27654-2.patch: also require the Destination URI to match the aliased location prefix, and add the corresponding check to ngx_http_map_uri_to_path
  • CVE-2026-27654
• SECURITY UPDATE: integer overflow in ngx_http_mp4_module on 32-bit platforms while validating atom entry counts
  • debian/patches/CVE-2026-27784.patch: widen the entries count to uint64_t in the stts, stss, ctts, stsc, stsz, stco and co64 atom size checks, so a crafted mp4 file can no longer cause reads and writes outside the allocated mp4 buffer
  • CVE-2026-27784

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-2026-1642: plain text data injection into the response from an upstream proxied server (bsc#1257675).
• CVE-2026-27654: buffer overflow in the NGINX worker process via the ngx_http_dav_module module (bsc#1260416).
• CVE-2026-27784: NGINX worker memory over-read or over-write via a specially crafted MP4 file (bsc#1260417).
• CVE-2026-28753: improper handling onf CRLF sequences in CRLF responses allows for arbitrary header injection into SMTP upstream requests (bsc#1260418).
• CVE-2026-28755: TLS handshakes can succeed with revoked certificates due to improper handling of such certificates by the ngx_stream_ssl_module module (bsc#1260419).

This update for nginx fixes the following issues:

• CVE-2026-1642: plain text data injection into the response from an upstream proxied server via MITM attack (bsc#1257675).
• CVE-2026-27654: buffer overflow in the NGINX worker process via the ngx_http_dav_module module (bsc#1260416).
• CVE-2026-27784: NGINX worker memory overread or overwrite via a specially crafted MP4 file (bsc#1260417).
• CVE-2026-28753: arbitrary header injection into SMTP upstream requests via attacker-controlled DNS server (bsc#1260418).

This update for nginx fixes the following issues

Security issues:

• CVE-2026-1642: plain text data injection into the response from an upstream proxied server (bsc#1257675).
• CVE-2026-27654: buffer overflow in the NGINX worker process via the ngx_http_dav_module module (bsc#1260416).
• CVE-2026-27784: NGINX worker memory over-read or over-write via a specially crafted MP4 file (bsc#1260417).
• CVE-2026-28753: improper handling onf CRLF sequences in DNS responses allows for arbitrary header injection into SMTP upstream requests (bsc#1260418).

Non security issue:

• nginx always runs into 'timed out. Killing' on shutdown when there are long-running processes (bsc#1243502).

This update for nginx fixes the following issues:

• CVE-2026-1642: plain text data injection into the response from an upstream proxied server (bsc#1257675).
• CVE-2026-27654: buffer overflow in the NGINX worker process via the ngx_http_dav_module module (bsc#1260416).
• CVE-2026-27784: NGINX worker memory over-read or over-write via a specially crafted MP4 file (bsc#1260417).
• CVE-2026-28753: improper handling onf CRLF sequences in CRLF responses allows for arbitrary header injection into SMTP upstream requests (bsc#1260418).
• CVE-2026-28755: TLS handshakes can succeed with revoked certificates due to improper handling of such certificates by the ngx_stream_ssl_module module (bsc#1260419).