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Vulnerability record · CVE-2026-5081 · published 6 May 2026

CVE-2026-5081: Chorny apache\ vulnerability

CChorny · Apache\

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.

9.1 CVSS 3.1 Critical EPSS 0.49% · top 60.6% CWE-340 · CWE-340CWE-341 · CWE-341
9.1CVSS 3.1 base score
0.49%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
15 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://httpd.apache.org/docs/current/mod/mod_unique_id.html Product
https://metacpan.org/pod/Apache::Session::Generate::Random Product
http://www.openwall.com/lists/oss-security/2026/05/06/6 Mailing ListThird Party Advisory
https://access.redhat.com/security/cve/CVE-2026-5081
https://bugzilla.redhat.com/show_bug.cgi?id=2467174
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5081.json

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.1CVE-2013-10075Chorny apache\ vulnerabilityApache::Session versions through 1.94 for Perl re-creates deleted sessions. The session stores Apache::Session::Store::File and Apache::Session::Stor…EPSS 0.36%9.1CVE-2025-40931Chorny apache\ vulnerabilityApache::Session::Generate::MD5 versions through 1.94 for Perl create insecure session id. Apache::Session::Generate::MD5 generates session ids insecu…EPSS 0.58%

Source: NIST National Vulnerability Database (record CVE-2026-5081), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.