CVE-2022-28738

Name: CVE-2022-28738
Creator: NVD / NIST
Published: 2022-05-09T18:15:08.49+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.57%

Last modified Jun 17, 2026

CVE-2022-28738 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A double free was found in the Regexp compiler in Ruby 3.x before 3.0.4 and 3.1.x before 3.1.2. If a victim attempts to create a Regexp from untrusted user input, an attacker may be able to write to unexpected memory locations.. EPSS estimates a 2.57% chance of exploitation in the next 30 days.

Description

A double free was found in the Regexp compiler in Ruby 3.x before 3.0.4 and 3.1.x before 3.1.2. If a victim attempts to create a Regexp from untrusted user input, an attacker may be able to write to unexpected memory locations.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

2.57%

83.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-415

Affected Software

Vendor	Product	Versions
Ruby-Lang	Ruby	>= 3.0.0, < 3.0.4
Ruby-Lang	Ruby	>= 3.1.0, < 3.1.2

References

https://hackerone.com/reports/1220911Permissions Required, Third Party Advisory
https://security-tracker.debian.org/tracker/CVE-2022-28738Patch, Third Party Advisory
https://security.gentoo.org/glsa/202401-27
https://security.netapp.com/advisory/ntap-20220624-0002/Third Party Advisory
https://www.ruby-lang.org/en/news/2022/04/12/double-free-in-regexp-compilation-cve-2022-28738/Vendor Advisory
https://hackerone.com/reports/1220911Permissions Required, Third Party Advisory
https://security-tracker.debian.org/tracker/CVE-2022-28738Patch, Third Party Advisory
https://security.gentoo.org/glsa/202401-27
https://security.netapp.com/advisory/ntap-20220624-0002/Third Party Advisory
https://www.ruby-lang.org/en/news/2022/04/12/double-free-in-regexp-compilation-cve-2022-28738/Vendor Advisory

Timeline

Published: May 9, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-28738?

How severe is CVE-2022-28738?

CVE-2022-28738 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.57% probability of exploitation in the next 30 days.

How do I fix CVE-2022-28738?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-28738?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST