Changes with nginx 1.29.7 24 Mar 2026
*) Security: a buffer overflow might occur while handling a COPY or MOVE
request in a location with "alias", allowing an attacker to modify
the source or destination path outside of the document root
(CVE-2026-27654).
Thanks to Calif.io in collaboration with Claude and Anthropic
Research.
*) Security: processing of a specially crafted mp4 file by the
ngx_http_mp4_module on 32-bit platforms might cause a worker process
crash, or might have potential other impact (CVE-2026-27784).
Thanks to Prabhav Srinath (sprabhav7).
*) Security: processing of a specially crafted mp4 file by the
ngx_http_mp4_module might cause a worker process crash, or might have
potential other impact (CVE-2026-32647).
Thanks to Xint Code and Pavel Kohout (Aisle Research).
*) Security: a segmentation fault might occur in a worker process if the
CRAM-MD5 or APOP authentication methods were used and authentication
retry was enabled (CVE-2026-27651).
Thanks to Arkadi Vainbrand.
*) Security: an attacker might use PTR DNS records to inject data in
auth_http requests, as well as in the XCLIENT command in the backend
SMTP connection (CVE-2026-28753).
Thanks to Asim Viladi Oglu Manizada, Colin Warren, Xiao Liu (Yunnan
University), Yuan Tan (UC Riverside), and Bird Liu (Lanzhou
University).
*) Security: SSL handshake might succeed despite OCSP rejecting a client
certificate in the stream module (CVE-2026-28755).
Thanks to Mufeed VH of Winfunc Research.
*) Feature: the "multipath" parameter of the "listen" directive.
*) Feature: the "local" parameter of the "keepalive" directive in the
"upstream" block.
*) Change: now the "keepalive" directive in the "upstream" block is
enabled by default.
*) Change: now ngx_http_proxy_module supports keepalive by default; the
default value for "proxy_http_version" is "1.1"; the "Connection"
proxy header is not sent by default anymore.
*) Bugfix: an invalid HTTP/2 request might be sent after switching to
the next upstream if buffered body was used in the
ngx_http_grpc_module.
