| Name | CVE-2026-5081 |
| Description | Apache::Session::Generate::ModUniqueId versions from 1.54 through 1.94 for Perl session ids are insecure. Apache::Session::Generate::ModUniqueId (added in version 1.54) uses the value of the UNIQUE_ID environment variable for the session id. The UNIQUE_ID variable is set by the Apache mod_unique_id plugin, which generates unique ids for the request. The id is based on the IPv4 address, the process id, the epoch time, a 16-bit counter and a thread index, with no obfuscation. The server IP is often available to the public, and if not available, can be guessed from previous session ids being issued. The process ids may also be guessed from previous session ids. The timestamp is easily guessed (and leaked in the HTTP Date response header). The purpose of mod_unique_id is to assign a unique id to requests so that events can be correlated in different logs. The id is not designed, nor is it suitable for security purposes. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| libapache-session-perl (PTS) | bullseye | 1.94-1 | vulnerable |
| forky, sid, bookworm, trixie | 1.94-2 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| libapache-session-perl | source | (unstable) | (unfixed) | unimportant |
[trixie] - libapache-session-perl <postponed> (Minor issue, revisit when fixed upstream)
[bookworm] - libapache-session-perl <postponed> (Minor issue, revisit when fixed upstream)
https://lists.security.metacpan.org/cve-announce/msg/39783104/
CVE exists to document that Apache::Session::Generate::ModUniqueId is
to use e.g. for where session id might be used for authentication or
provides access to restricted data and to use Apache::Session::Generate::Random
in such cases.