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Fencer Vulns
critical 9.8

CVE-2022-28738 json

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.

published 2022-05-09 4 y ago modified 2026-09-08 2 mo ago also BIT-ruby-2022-28738 , BIT-ruby-min-2022-28738 , EUVD-2022-33177

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.1%
EPSS 3.1% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami ruby 3.0.4, 3.1.2
  • bitnami ruby-min 3.0.4, 3.1.2
  • ruby-lang ruby 3.0.4, 3.1.2
  • ruby3.0 Ubuntu 22.04 LTS 3.0.2-7ubuntu2.1

ubuntu advisories UBUNTU-CVE-2022-28738

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

  • ruby RHEL 8 3.0.4-141.module+el8.6.0+16311+3e5e17e9
  • rubygems RHEL 8 3.2.33-141.module+el8.6.0+16311+3e5e17e9
  • ruby-libs RHEL 8 3.0.4-141.module+el8.6.0+16311+3e5e17e9
  • rubygem-pg RHEL 8 1.2.3-1.module+el8.5.0+11580+845038eb
  • rubygem-irb RHEL 8 1.3.5-141.module+el8.6.0+16311+3e5e17e9
  • rubygem-rbs RHEL 8 1.4.0-141.module+el8.6.0+16311+3e5e17e9
  • rubygem-rss RHEL 8 0.2.9-141.module+el8.6.0+16311+3e5e17e9
  • rubygem-abrt RHEL 8 0.4.0-1.module+el8.5.0+11580+845038eb

red hat advisories RHSA-2022:6450RHSA-2022:6855RHSA-2022:6585

  • ruby4.0 openSUSE Tumbleweed 4.0.0~preview2-1.1
  • ruby3.4 openSUSE Tumbleweed 3.4.1-1.1
  • ruby3.1 openSUSE Tumbleweed 3.1.2-1.1
  • ruby3.2 openSUSE Tumbleweed 3.2.1-1.1
  • ruby3.3 openSUSE Tumbleweed 3.3.0-1.2

opensuse advisories openSUSE-SU-2025:15819-1openSUSE-SU-2025:14621-1openSUSE-SU-2024:12006-1openSUSE-SU-2024:12712-1openSUSE-SU-2024:13623-1

  • ruby AlmaLinux 9 3.0.4-160.el9_0
  • rubygems AlmaLinux 9 3.2.33-160.el9_0
  • ruby-libs AlmaLinux 9 3.0.4-160.el9_0
  • rubygem-irb AlmaLinux 9 1.3.5-160.el9_0
  • rubygem-rbs AlmaLinux 9 1.4.0-160.el9_0
  • rubygem-rss AlmaLinux 9 0.2.9-160.el9_0
  • rubygem-json AlmaLinux 9 2.5.1-160.el9_0
  • rubygem-rake AlmaLinux 9 13.0.3-160.el9_0

almalinux advisories ALSA-2022:6585ALSA-2022:6450

  • ruby Rocky Linux 9 3.0.4-160.el9_0
  • ruby Rocky Linux 8 3.0.4-141.module+el8.6.0+1002+a7dba0ac
  • rubygem-pg Rocky Linux 8 1.2.3-1.module+el8.5.0+668+665814fa
  • rubygem-pg Rocky Linux 8 1.2.3-1.module+el8.4.0+411+b946f28c
  • rubygem-pg Rocky Linux 8 1.2.3-1.module+el8.4.0+594+11b6673a
  • rubygem-abrt Rocky Linux 8 0.4.0-1.module+el8.5.0+668+665814fa
  • rubygem-abrt Rocky Linux 8 0.4.0-1.module+el8.4.0+411+b946f28c
  • rubygem-abrt Rocky Linux 8 0.4.0-1.module+el8.4.0+594+11b6673a

rocky linux advisories RLSA-2022:6585RLSA-2022:6450

  • ruby Alpine 3.15 3.0.4-r0
  • ruby Alpine 3.24, Alpine 3.23, Alpine 3.22 +6 more 3.1.2-r0

alpine advisories ALPINE-CVE-2022-28738

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • ruby Arch Linux 3.0.4-1

arch linux advisories AVG-2757

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-2022-28738 updated cvss 7.7

Ruby: Double free in Regexp compilation

  • Red Hat CodeReady Linux Builder (v. 9) ruby-doc 3.0.4-160.el9_0
    fixed: vendor fix RHSA-2022:6585
  • Red Hat Enterprise Linux AppStream (v. 8) ruby 3.0.4-141.module+el8.6.0+16311+3e5e17e9, rubygem-pg 1.2.3-1.module+el8.5.0+11580+845038eb, ruby-libs 3.0.4-141.module+el8.6.0+16311+3e5e17e9, rubygems 3.2.33-141.module+el8.6.0+16311+3e5e17e9, rubygem-abrt 0.4.0-1.module+el8.5.0+11580+845038eb, rubygem-irb 1.3.5-141.module+el8.6.0+16311+3e5e17e9, +16 more
    fixed: vendor fix RHSA-2022:6450
  • Red Hat Enterprise Linux AppStream (v. 9) ruby 3.0.4-160.el9_0, ruby-libs 3.0.4-160.el9_0, rubygems 3.2.33-160.el9_0, rubygem-irb 1.3.5-160.el9_0, rubygem-rbs 1.4.0-160.el9_0, rubygem-rss 0.2.9-160.el9_0, +13 more
    fixed: vendor fix RHSA-2022:6585
  • Red Hat Software Collections for RHEL Workstation(v. 7) rh-ruby30-ruby 3.0.4-149.el7, rh-ruby30-ruby-libs 3.0.4-149.el7, rh-ruby30-rubygems 3.2.33-149.el7, rh-ruby30-rubygem-irb 1.3.5-149.el7, rh-ruby30-rubygem-rbs 1.4.0-149.el7, rh-ruby30-rubygem-rss 0.2.9-149.el7, +12 more Red Hat Software Collections for RHEL(v. 7) rh-ruby30-ruby 3.0.4-149.el7, rh-ruby30-ruby-libs 3.0.4-149.el7, rh-ruby30-rubygems 3.2.33-149.el7, rh-ruby30-rubygem-irb 1.3.5-149.el7, rh-ruby30-rubygem-rbs 1.4.0-149.el7, rh-ruby30-rubygem-rss 0.2.9-149.el7, +12 more
    fixed: vendor fix RHSA-2022:6855
  • Red Hat Enterprise Linux 6 ruby, ruby-ri, ruby-irb, ruby-libs, ruby-rdoc, ruby-tcltk Red Hat Enterprise Linux 7 ruby, ruby-irb, rubygems, ruby-libs, ruby-tcltk, rubygem-json, +6 more Red Hat Enterprise Linux 8 ruby, ruby-irb, rubygems, ruby-libs, rubygem-pg, rubygem-irb, +25 more Red Hat Software Collections rh-ruby27-ruby, rh-ruby27-rubygems, rh-ruby27-ruby-libs, rh-ruby27-rubygem-irb, rh-ruby27-rubygem-json, rh-ruby27-rubygem-racc, +13 more
    not affected: vulnerable code not present

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 ICSA-24-046-11 updated cvss 9.8

Siemens SCALANCE XCM-/XRM-300

  • Siemens SCALANCE XCH328 (6GK5328-4TS01-2EC2) <V2.4 Siemens SCALANCE XCM324 (6GK5324-8TS01-2AC2) <V2.4 Siemens SCALANCE XCM328 (6GK5328-4TS01-2AC2) <V2.4 Siemens SCALANCE XCM332 (6GK5332-0GA01-2AC2) <V2.4 Siemens SCALANCE XRH334 (24 V DC, 8xFO, CC) (6GK5334-2TS01-2ER3) <V2.4 Siemens SCALANCE XRM334 (2x230 V AC, 8xFO) (6GK5334-2TS01-4AR3) <V2.4
    +5 more products
    Siemens SCALANCE XRM334 (2x230 V AC, 12xFO) (6GK5334-3TS01-4AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 8xFO) (6GK5334-2TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 12xFO) (6GK5334-3TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 8xFO) (6GK5334-2TS01-3AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 12xFO) (6GK5334-3TS01-3AR3) <V2.4
    affected: fixed in V2.4 support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

3.14% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
OSV 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
bitnami ruby
>=3.0.0, <3.0.4
>=3.1.0, <3.1.2
3.0.4
3.1.2
bitnami ruby-min
>=3.0.0, <3.0.4
>=3.1.0, <3.1.2
3.0.4
3.1.2

Classification

Weakness

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.