From 1c0f533c21079163a6b324151ec7b53490c61eaa Mon Sep 17 00:00:00 2001 From: Hitendra Prajapati Date: Wed, 22 Apr 2026 17:27:01 +0530 Subject: [PATCH] nginx: fix CVE-2026-32647 As per the advisory[1] mentioned in NVD[2], version 1.28.3 contains the fix. Backport the commit[3] from 1.28.3 changelog matching the description. [1] https://my.f5.com/manage/s/article/K000160366 [2] https://nvd.nist.gov/vuln/detail/CVE-2026-32647 [3] https://github.com/nginx/nginx/commit/a172c880cb51f882a5dc999437e8b3a4f87630cc Signed-off-by: Hitendra Prajapati Signed-off-by: Gyorgy Sarvari --- .../nginx/nginx-1.24.0/CVE-2026-32647.patch | 78 +++++++++++++++++++ .../recipes-httpd/nginx/nginx_1.24.0.bb | 1 + 2 files changed, 79 insertions(+) create mode 100644 meta-webserver/recipes-httpd/nginx/nginx-1.24.0/CVE-2026-32647.patch diff --git a/meta-webserver/recipes-httpd/nginx/nginx-1.24.0/CVE-2026-32647.patch b/meta-webserver/recipes-httpd/nginx/nginx-1.24.0/CVE-2026-32647.patch new file mode 100644 index 0000000000..d7bedb6b8b --- /dev/null +++ b/meta-webserver/recipes-httpd/nginx/nginx-1.24.0/CVE-2026-32647.patch @@ -0,0 +1,78 @@ +From a172c880cb51f882a5dc999437e8b3a4f87630cc Mon Sep 17 00:00:00 2001 +From: Roman Arutyunyan +Date: Sat, 21 Feb 2026 12:04:36 +0400 +Subject: [PATCH] Mp4: avoid zero size buffers in output. + +Previously, data validation checks did not cover the cases when the output +contained empty buffers. Such buffers are considered illegal and produce +"zero size buf in output" alerts. The change rejects the mp4 files which +produce such alerts. + +Also, the change fixes possible buffer overread and overwrite that could +happen while processing empty stco and co64 atoms, as reported by +Pavel Kohout (Aisle Research) and Tim Becker. + +CVE: CVE-2026-32647 +Upstream-Status: Backport [https://github.com/nginx/nginx/commit/a172c880cb51f882a5dc999437e8b3a4f87630cc] +Signed-off-by: Hitendra Prajapati +--- + src/http/modules/ngx_http_mp4_module.c | 15 +++++++++------ + 1 file changed, 9 insertions(+), 6 deletions(-) + +diff --git a/src/http/modules/ngx_http_mp4_module.c b/src/http/modules/ngx_http_mp4_module.c +index a7f8be7..015e42c 100644 +--- a/src/http/modules/ngx_http_mp4_module.c ++++ b/src/http/modules/ngx_http_mp4_module.c +@@ -901,8 +901,11 @@ ngx_http_mp4_process(ngx_http_mp4_file_t *mp4) + } + } + +- if (end_offset < start_offset) { +- end_offset = start_offset; ++ if (end_offset <= start_offset) { ++ ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, ++ "no data between start time and end time in \"%s\"", ++ mp4->file.name.data); ++ return NGX_ERROR; + } + + mp4->moov_size += 8; +@@ -913,7 +916,7 @@ ngx_http_mp4_process(ngx_http_mp4_file_t *mp4) + + *prev = &mp4->mdat_atom; + +- if (start_offset > mp4->mdat_data.buf->file_last) { ++ if (start_offset >= mp4->mdat_data.buf->file_last) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "start time is out mp4 mdat atom in \"%s\"", + mp4->file.name.data); +@@ -3416,7 +3419,7 @@ ngx_http_mp4_update_stsz_atom(ngx_http_mp4_file_t *mp4, + if (data) { + entries = trak->sample_sizes_entries; + +- if (trak->start_sample > entries) { ++ if (trak->start_sample >= entries) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "start time is out mp4 stsz samples in \"%s\"", + mp4->file.name.data); +@@ -3591,7 +3594,7 @@ ngx_http_mp4_update_stco_atom(ngx_http_mp4_file_t *mp4, + return NGX_ERROR; + } + +- if (trak->start_chunk > trak->chunks) { ++ if (trak->start_chunk >= trak->chunks) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "start time is out mp4 stco chunks in \"%s\"", + mp4->file.name.data); +@@ -3806,7 +3809,7 @@ ngx_http_mp4_update_co64_atom(ngx_http_mp4_file_t *mp4, + return NGX_ERROR; + } + +- if (trak->start_chunk > trak->chunks) { ++ if (trak->start_chunk >= trak->chunks) { + ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0, + "start time is out mp4 co64 chunks in \"%s\"", + mp4->file.name.data); +-- +2.50.1 + diff --git a/meta-webserver/recipes-httpd/nginx/nginx_1.24.0.bb b/meta-webserver/recipes-httpd/nginx/nginx_1.24.0.bb index a8bbfae9f5..57c03e14cb 100644 --- a/meta-webserver/recipes-httpd/nginx/nginx_1.24.0.bb +++ b/meta-webserver/recipes-httpd/nginx/nginx_1.24.0.bb @@ -8,6 +8,7 @@ SRC_URI:append = " \ file://CVE-2026-27651.patch \ file://CVE-2026-27654.patch \ file://CVE-2026-28753.patch \ + file://CVE-2026-32647.patch \ " SRC_URI[sha256sum] = "77a2541637b92a621e3ee76776c8b7b40cf6d707e69ba53a940283e30ff2f55d"