CVE-2026-5081 Affecting libapache-session-perl package, versions *


Severity

Recommended
low

Based on Debian security rating.

Threat Intelligence

EPSS
0.3% (23rd percentile)

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  • Snyk IDSNYK-DEBIAN11-LIBAPACHESESSIONPERL-16439046
  • published7 May 2026
  • disclosed6 May 2026

Introduced: 6 May 2026

CVE-2026-5081  (opens in a new tab)

How to fix?

There is no fixed version for Debian:11 libapache-session-perl.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libapache-session-perl package and not the libapache-session-perl package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1