Kredis JSON Possible Deserialization of Untrusted Data Vulnerability

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-2023-27531: 0.54% estimated exploitation activity in the next 30 days; percentile 45.59 (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.

There is a deserialization of untrusted data vulnerability in the Kredis JSON deserialization code. This vulnerability has been assigned the CVE identifier CVE-2023-27531. 'Not affected: None.' 'Versions Affected: All.' 'Fixed Versions: 1.3.0.1' Impact Carefully crafted JSON data processed by Kredis may result in deserialization of untrusted data, potentially leading to deserialization of unexpected objects in the system. Any applications using Kredis with JSON are affected. Releases The fixed releases are available at the normal locations. Workarounds There are no feasible workarounds for this issue. Patches To aid users who aren’t able to upgrade immediately we have provided patches for the two supported release series. They are in git-am format and consist of a single changeset. 1-3-0-1-kredis.patch - Patch for 1.3.0 series Credits Thank you oooooook 7 for reporting this!

Published by the source

9 Jun 2023, 22:40 UTC

Last modified by the source

10 Jan 2025, 13:51 UTC

Source last checked

26 Oct 2026, 15:48 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-h2wm-p2vg-6pw4

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# Patch Next advisory brief: CVE-2023-27531

Advisory: Kredis JSON Possible Deserialization of Untrusted Data Vulnerability
IDs: CVE-2023-27531, GHSA-h2wm-p2vg-6pw4
Record: https://patchnext.com/advisories/cve-2023-27531 (revision 1, source checked 26 Oct 2026, 15:48 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: kredis 1.3.0.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- RubyGems kredis: affected < 1.3.0.1; fixed in 1.3.0.1

## Suggested inspection (read-only)
- RubyGems kredis: 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 kredis.
- 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-h2wm-p2vg-6pw4 (GitHub-reviewed advisory GHSA-h2wm-p2vg-6pw4 lists affected ranges: RubyGems kredis >=0 <1.3.0.1)

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