Activerecord-session_store Vulnerable to Timing Attack

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS

• CVE-2019-25025: 1.84% estimated exploitation activity in the next 30 days; percentile 78.96 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

The activerecord-sessionstore (aka Active Record Session Store) component through 1.1.3 for Ruby on Rails does not use a constant-time approach when delivering information about whether a guessed session ID is valid. Consequently, remote attackers can leverage timing discrepancies to achieve a correct guess in a relatively short amount of time. This is a related issue to CVE-2019-16782. Recommendation This has been fixed in version 2.0.0. All users are advised to update to this version or later.

Published by the source

9 Mar 2021, 00:45 UTC

Last modified by the source

5 Sep 2023, 22:00 UTC

Source last checked

26 Oct 2026, 15:47 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-cvw2-xj8r-mjf7

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# Patch Next advisory brief: CVE-2019-25025

Advisory: Activerecord-session_store Vulnerable to Timing Attack
IDs: CVE-2019-25025, GHSA-cvw2-xj8r-mjf7
Record: https://patchnext.com/advisories/cve-2019-25025 (revision 1, source checked 26 Oct 2026, 15:47 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: activerecord-session_store 2.0.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- RubyGems activerecord-session_store: affected <= 1.1.3; fixed in 2.0.0

## Suggested inspection (read-only)
- RubyGems activerecord-session_store: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on activerecord-session_store.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-cvw2-xj8r-mjf7 (GitHub-reviewed advisory GHSA-cvw2-xj8r-mjf7 lists affected ranges: RubyGems activerecord-session_store >=0 <=1.1.3)

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