CVE-2018-25160: HTTP::Session2 versions through 1.09 for Perl does not validate the format of user provided session ids, enabling code injection or other impact depending on session backend

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-27 · updated 2026-06-17
Weakness: CWE-20

Description

HTTP::Session2 versions through 1.09 for Perl does not validate the format of user provided session ids, enabling code injection or other impact depending on session backend. For example, if an application uses memcached for session storage, then it may be possible for a remote attacker to inject memcached commands in the session id value.

Affected products

TOKUHIROM Http::Session2: through 1.09

References

https://github.com/tokuhirom/HTTP-Session2/commit/813838f6d08034b6a265a70e53b59b941b5d3e6d.patch
https://metacpan.org/pod/Cache::Memcached::Fast::Safe
https://metacpan.org/release/TOKUHIROM/HTTP-Session2-1.10/source/Changes
http://www.openwall.com/lists/oss-security/2026/02/27/13

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