CVE-2025-46336Network attack vector

Session persistence via concurrent post-logout write

Published May 8, 2025 · Updated May 8, 2025

Race condition in Rack rack-session 2.0.0 through 2.1.0 allows remote authenticated users to retain access after session logout. Rack::Session::Pool loads session state at request start, then write_session stores it after the application responds without confirming that logout deleted the session during the request. Exploitation requires a valid session cookie and a long-running request concurrent with logout; the stale write restores the deleted session and preserves its access.

CVSS severity4.2
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Rack rack-session 2.0.0 through 2.1.0 allows remote authenticated users to retain access after session logout. Rack::Session::Pool loads session state at request start, then write_session stores it after the application responds without confirming that logout deleted the session during the request. Exploitation requires a valid session cookie and a long-running request concurrent with logout; the stale write restores the deleted session and preserves its access.

The record

CVE
CVE-2025-46336
Published
May 8, 2025
Updated
May 8, 2025
Vendor
Rack
Product
rack-session
Classifications
CWE-613, CWE-367, CWE-362, T1550.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2025CVE publishedPublication date reported by the CVE source.
  2. May 8, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 2.0.0, < 2.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Rack · rack-sessionversion=>= 2.0.0, < 2.1.1

Published CVSS scores

4.2GitHubCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-613Insufficient Session Expiration
CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1550.004Use Alternate Authentication Material: Web Session Cookie

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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