| Name | CVE-2025-23419 |
| Description | When multiple server blocks are configured to share the same IP address and port, an attacker can use session resumption to bypass client certificate authentication requirements on these servers. This vulnerability arises when TLS Session Tickets https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_ticket_key are used and/or the SSL session cache https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_cache are used in the default server and the default server is performing client certificate authentication. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1095403 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| nginx (PTS) | bullseye (security), bullseye | 1.18.0-6.1+deb11u3 | vulnerable |
| bookworm | 1.22.1-9 | vulnerable |
| sid, trixie | 1.26.3-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| nginx | source | (unstable) | 1.26.3-2 | | | 1095403 |
Notes
[bookworm] - nginx <no-dsa> (Minor issue; can be mitigated with by configuration)
https://www.openwall.com/lists/oss-security/2025/02/05/8
https://github.com/nginx/nginx/commit/13935cf9fdc3c8d8278c70716417d3b71c36140e (release-1.26.3)