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Fencer Vulns
medium 4.2

CVE-2025-32441 json

Rack session gets restored after deletion

published 2025-05-07 18 mo ago modified 2026-09-10 1 mo ago also EUVD-2025-13949 , GHSA-vpfw-47h7-xj4g

cvss
4.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits
0
none known

Summary

Rack is a modular Ruby web server interface. Prior to version 2.2.14, when using the `Rack::Session::Pool` middleware, simultaneous rack requests can restore a deleted rack session, which allows the unauthenticated user to occupy that session. Rack session middleware prepares the session at the beginning of request, then saves is back to the store with possible changes applied by host rack application. This way the session becomes to be a subject of race conditions in general sense over concurrent rack requests. 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. Version 2.2.14 contains a patch for the issue. Some other mitigations are available. Either ensure the application invalidates sessions atomically by marking them as logged out e.g., using a `logged_out` flag, instead of deleting them, and check this flag on every request to prevent reuse; or implement a custom session store that tracks session invalidation timestamps and refuses to accept session data if the session was invalidated after the request began.

Patch / fix

  • rubygems rack 2.2.14
  • rack rack 2.2.14
  • rack_project rack 2.2.14
  • ruby-rack Debian 12 2.2.20-0+deb12u1
  • ruby-rack Debian 14, Debian 13 3.0.8-2

debian advisories DEBIAN-CVE-2025-32441

  • ruby-rack Ubuntu 24.04 LTS 2.2.7-1ubuntu0.3
  • ruby-rack Ubuntu 26.04 LTS, Ubuntu 25.10 3.1.16-0.1
  • ruby-rack Ubuntu Pro 14.04 LTS 1.5.2-3+deb8u3ubuntu1~esm10
  • ruby-rack Ubuntu Pro 16.04 LTS 1.6.4-3ubuntu0.2+esm8
  • ruby-rack Ubuntu Pro 18.04 LTS 1.6.4-4ubuntu0.2+esm8
  • ruby-rack Ubuntu Pro 20.04 LTS 2.0.7-2ubuntu0.1+esm7
  • ruby-rack Ubuntu Pro 22.04 LTS 2.1.4-5ubuntu1.1+esm2

ubuntu advisories UBUNTU-CVE-2025-32441

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • rmt-server SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Module for Server Applications 15 SP6 +5 more 2.23-150500.3.34.2
  • rmt-server SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Module for Public Cloud 15 SP3 +2 more 2.23-150300.3.54.1
  • rmt-server SLE Module for Server Applications 15 SP7, SLE Module for Public Cloud 15 SP7 2.23-150700.3.6.1
  • rmt-server SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Module for Public Cloud 15 SP4 +4 more 2.23-150400.3.42.1
  • rubygem-rack SLE High Availability Extension 15 SP7, SLE High Availability Extension 15 SP6, SLE High Availability Extension 15 SP5 +3 more 2.0.8-150000.3.31.1

suse advisories SUSE-SU-2025:02564-1SUSE-SU-2025:02429-1SUSE-SU-2025:02330-1SUSE-SU-2025:02329-1SUSE-SU-2025:01586-2SUSE-SU-2025:01586-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-32441 updated cvss 4.2

rack: Rack Session Reuse Vulnerability

  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/fluentd-rhel8, openshift-logging/fluentd-rhel9 Red Hat 3scale API Management Platform 2 3scale-amp2/zync-rhel8, 3scale-amp2/zync-rhel9 Red Hat Enterprise Linux 7 pcs, pcs-snmp, python-clufter Red Hat Enterprise Linux 8 pcs, pcs-snmp Red Hat Enterprise Linux 9 pcs, pcs-snmp Red Hat Satellite 6 rubygem-rack
    affected: no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

0.28% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.2 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
GitHub 3.1 4.2 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
NVD 3.1 4.2 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
rubygems rack
<2.2.14
2.2.14

Affected products

  • rack rack

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
  • CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
  • CWE-613 DEPRECATED: Insufficient Session Expiration

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.