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