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Fencer Vulns
high 7.5

CVE-2022-28739 json

There is a buffer over-read in Ruby before 2.6.10, 2.7.x before 2.7.6, 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-2022-28739 , BIT-ruby-min-2022-28739 , EUVD-2022-33178 , JLSEC-2026-1290

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.4%
EPSS 4.4% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

There is a buffer over-read in Ruby before 2.6.10, 2.7.x before 2.7.6, 3.x before 3.0.4, and 3.1.x before 3.1.2. It occurs in String-to-Float conversion, including Kernel#Float and String#to_f.

Patch / fix

  • bitnami ruby 2.6.10, 2.7.6, 3.0.4, 3.1.2
  • bitnami ruby-min 2.6.10, 2.7.6, 3.0.4, 3.1.2
  • ruby-lang ruby 2.6.10, 2.7.6, 3.0.4, 3.1.2
  • apple macos 11.7.1, 12.6.1
  • ruby2.7 Debian 11 2.7.4-1+deb11u2

debian advisories DEBIAN-CVE-2022-28739

  • ruby2.5 Ubuntu 18.04 LTS 2.5.1-1ubuntu1.12
  • ruby2.7 Ubuntu 20.04 LTS 2.7.0-5ubuntu1.7
  • ruby3.0 Ubuntu 22.04 LTS 3.0.2-7ubuntu2.1
  • ruby2.3 Ubuntu Pro 16.04 LTS 2.3.1-2~ubuntu16.04.16+esm3

ubuntu advisories UBUNTU-CVE-2022-28739

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

  • ruby4.0 hummingbird 1 4.0.0-33.3.hum1
  • ruby4.0-libs hummingbird 1 4.0.0-33.3.hum1
  • ruby4.0-bundled-gems hummingbird 1 4.0.0-33.3.hum1
  • ruby4.0-default-gems hummingbird 1 4.0.0-33.3.hum1
  • ruby3.3 hummingbird 1 3.3.10-23.1.hum1
  • ruby3.3-libs hummingbird 1 3.3.10-23.1.hum1
  • ruby3.3-bundled-gems hummingbird 1 3.3.10-23.1.hum1
  • ruby3.3-default-gems hummingbird 1 3.3.10-23.1.hum1

red hat advisories RHSA-2026:8838RHSA-2026:7305RHSA-2026:7307RHSA-2023:7025RHSA-2022:6450RHSA-2022:6447

  • ruby2.5 SLES for SAP 15 SP2, SLES for SAP 15 SP1, SLES for SAP 15 +21 more 2.5.9-150000.4.23.1

suse advisories SUSE-SU-2022:1512-1

  • 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 8 2.5.9-111.module_el8.9.0+3635+c6f99506
  • ruby-irb AlmaLinux 8 2.5.9-111.module_el8.9.0+3635+c6f99506
  • rubygems AlmaLinux 8 2.7.6.3-111.module_el8.9.0+3635+c6f99506
  • ruby-libs AlmaLinux 8 2.5.9-111.module_el8.9.0+3635+c6f99506
  • rubygem-pg AlmaLinux 8 1.0.0-3.module_el8.9.0+3635+c6f99506
  • rubygem-abrt AlmaLinux 8 0.3.0-4.module_el8.5.0+2625+ec418553
  • rubygem-bson AlmaLinux 8 4.3.0-2.module_el8.5.0+2625+ec418553
  • rubygem-bson AlmaLinux 8 4.3.0-2.module_el8.6.0+3170+4b08f9d4

almalinux advisories ALSA-2023:7025ALSA-2022:6585ALSA-2022:6447ALSA-2022:6450

  • ruby Rocky Linux 8 2.5.9-111.module+el8.9.0+1536+5f79634e
  • rubygem-pg Rocky Linux 8 1.0.0-3.module+el8.9.0+1536+5f79634e
  • rubygem-abrt Rocky Linux 8 0.3.0-4.module+el8.9.0+1536+5f79634e
  • rubygem-abrt Rocky Linux 8 0.3.0-4.module+el8.5.0+738+032c9c02
  • rubygem-bson Rocky Linux 8 4.3.0-2.module+el8.9.0+1536+5f79634e
  • rubygem-mongo Rocky Linux 8 2.5.1-2.module+el8.9.0+1536+5f79634e
  • rubygem-mysql2 Rocky Linux 8 0.4.10-4.module+el8.9.0+1536+5f79634e
  • rubygem-bundler Rocky Linux 8 1.16.1-4.module+el8.9.0+1536+5f79634e

rocky linux advisories RLSA-2023:7025RLSA-2022:6585RLSA-2022:6450RLSA-2022:6447RLSA-2022:5338

  • ruby Alpine 3.14, Alpine 3.13, Alpine 3.12 2.7.6-r0
  • 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-2022-28739

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-2022-28739 updated cvss 6.2

ruby: Buffer overrun in String-to-Float conversion

  • 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
    affected: no fix planned “Out of support scope”
  • Red Hat Hardened Images ruby
    affected: no fix available
  • 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 2.5.9-111.module+el8.9.0+19193+435404ae, ruby 2.7.6-138.module+el8.6.0+16148+54b2ba8f, ruby 3.0.4-141.module+el8.6.0+16311+3e5e17e9, ruby 2.6.10-109.module+el8.6.0+15475+c55337b4, rubygem-pg 1.1.4-1.module+el8.1.0+3653+beb38eb0, rubygem-pg 1.2.3-1.module+el8.3.0+7192+4e3a532a, +85 more
    fixed: vendor fix RHSA-2022:5338
  • 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 Hardened Images ruby3.4 3.4.8-31.1.hum1, ruby4.0 4.0.0-33.3.hum1, ruby3.3 3.3.10-23.1.hum1, ruby3.4-libs 3.4.8-31.1.hum1, ruby4.0-libs 4.0.0-33.3.hum1, ruby3.3-libs 3.3.10-23.1.hum1, +6 more
    fixed: vendor fix RHSA-2026:7305
  • Red Hat Software Collections for RHEL Workstation(v. 7) rh-ruby27-ruby 2.7.6-131.el7, rh-ruby30-ruby 3.0.4-149.el7, rh-ruby27-rubygems 3.1.6-131.el7, rh-ruby27-ruby-libs 2.7.6-131.el7, rh-ruby30-ruby-libs 3.0.4-149.el7, rh-ruby30-rubygems 3.2.33-149.el7, +31 more Red Hat Software Collections for RHEL(v. 7) rh-ruby27-ruby 2.7.6-131.el7, rh-ruby30-ruby 3.0.4-149.el7, rh-ruby27-rubygems 3.1.6-131.el7, rh-ruby27-ruby-libs 2.7.6-131.el7, rh-ruby30-ruby-libs 3.0.4-149.el7, rh-ruby30-rubygems 3.2.33-149.el7, +31 more
    fixed: vendor fix RHSA-2022:6856
  • Red Hat Hardened Images rubygem3.3-rbs 3.4.0-23.1.hum1, rubygem3.3-rss 0.3.1-23.1.hum1, rubygem3.4-rbs 3.8.0-31.1.hum1, rubygem3.4-rss 0.3.1-31.1.hum1, rubygem4.0-rss 0.3.2-33.3.hum1, rubygem3.3-irb 1.13.1-23.1.hum1, +45 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 7.5

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

4.37% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
bitnami ruby
<2.6.10
>=2.7.0, <2.7.6
>=3.0.0, <3.0.4
>=3.1.0, <3.1.2
2.6.10
2.7.6
3.0.4
3.1.2
bitnami ruby-min
<2.6.10
>=2.7.0, <2.7.6
>=3.0.0, <3.0.4
>=3.1.0, <3.1.2
2.6.10
2.7.6
3.0.4
3.1.2
julia ruby_jll
all versions
 no fix listed

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.