synced 8 MIN AGO
01 Record

CVE-2021-28965

The REXML gem before 3.2.5 in Ruby before 2.6.7, 2.7.x before 2.7.3, and 3.x before 3.0.1 does not properly address XML round-trip issues. An incorrect document can be produced after parsing and

UnratedPUBLISHEDCNA: mitre
CNA base scoreUnratedNo CNA CVSS vector
View raw JSON

02 Description

The REXML gem before 3.2.5 in Ruby before 2.6.7, 2.7.x before 2.7.3, and 3.x before 3.0.1 does not properly address XML round-trip issues. An incorrect document can be produced after parsing and

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
5.06% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 92.0% of scored records. A rank, not a probability.
NVD base score
7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2021-04-21 06:55Z5 YR AGO
Last updated
2024-08-03 21:55Z2 YR AGO
Reserved
2021-03-22
Assigning CNA
mitre
Record state
PUBLISHED
Severity
Not rated by the issuing CNA
CNA CVSS vector
Not published by the issuing CNA
Weaknesses
  • CWE-611Improper Restriction of XML External Entity ReferenceBase
Data version
5.1
Document digest
c9decb3268222cad5e7fcfdae480d3bbaa022e09edb53e0470cf16b2588eea88

05 Affected products

VendorProductVersionsPlatforms
fedoraprojectfedoraNot specified—
redhatcloudforms_managementengineNot specified—
redhatenterprise_linuxNot specified—
redhathummingbirdNot specified—
redhatrhel_e4sNot specified—
redhatrhel_eusNot specified—
redhatrhel_software_collectionsNot specified—
ruby-langrexmlNot specified—
ruby-langrubyNot specified—

06 References

07 Fixed in

AlmaLinux 8

  • rubygem-abrt
    Fixed

    A version is affected if any line below covers it.

    • Affected before 0.3.0-4.module_el8.5.0+259+8cec6917
    • Affected before 0.3.0-4.module_el8.5.0+2623+08a8ba32
    • Affected before 0.3.0-4.module_el8.5.0+2625+ec418553
    • Affected before 0.4.0-1.module_el8.3.0+6147+d0dfc1e4
    • Affected before 0.4.0-1.module_el8.4.0+2399+4e3a532a
    • Affected before 0.4.0-1.module_el8.5.0+118+1ab773e1
  • rubygem-abrt-doc
    Fixed

    A version is affected if any line below covers it.

    • Affected before 0.3.0-4.module_el8.5.0+259+8cec6917
    • Affected before 0.3.0-4.module_el8.5.0+2623+08a8ba32
    • Affected before 0.3.0-4.module_el8.5.0+2625+ec418553
    • Affected before 0.4.0-1.module_el8.3.0+6147+d0dfc1e4
    • Affected before 0.4.0-1.module_el8.4.0+2399+4e3a532a
    • Affected before 0.4.0-1.module_el8.5.0+118+1ab773e1
  • rubygem-bson
    Fixed

    A version is affected if any line below covers it.

    • Affected before 4.3.0-2.module_el8.5.0+259+8cec6917
    • Affected before 4.3.0-2.module_el8.5.0+2625+ec418553
    • Affected before 4.5.0-1.module_el8.5.0+250+ba22dbf7
    • Affected before 4.5.0-1.module_el8.5.0+2623+08a8ba32
    • Affected before 4.8.1-1.module_el8.3.0+6147+d0dfc1e4
    • Affected before 4.8.1-1.module_el8.4.0+2399+4e3a532a
    • Affected before 4.8.1-1.module_el8.5.0+117+35d1289b
  • rubygem-bson-doc
    Fixed

    A version is affected if any line below covers it.

    • Affected before 4.3.0-2.module_el8.5.0+259+8cec6917
    • Affected before 4.3.0-2.module_el8.5.0+2625+ec418553
    • Affected before 4.5.0-1.module_el8.5.0+250+ba22dbf7
    • Affected before 4.5.0-1.module_el8.5.0+2623+08a8ba32
    • Affected before 4.8.1-1.module_el8.3.0+6147+d0dfc1e4
  • rubygem-mongo
    Fixed

    A version is affected if any line below covers it.

    • Affected before 2.11.3-1.module_el8.3.0+6147+d0dfc1e4
    • Affected before 2.5.1-2.module_el8.5.0+259+8cec6917
    • Affected before 2.5.1-2.module_el8.5.0+2625+ec418553
    • Affected before 2.8.0-1.module_el8.5.0+250+ba22dbf7
    • Affected before 2.8.0-1.module_el8.5.0+2623+08a8ba32
  • rubygem-mongo-doc
    Fixed

    A version is affected if any line below covers it.

    • Affected before 2.11.3-1.module_el8.3.0+6147+d0dfc1e4
    • Affected before 2.5.1-2.module_el8.5.0+259+8cec6917
    • Affected before 2.5.1-2.module_el8.5.0+2625+ec418553
    • Affected before 2.8.0-1.module_el8.5.0+250+ba22dbf7
    • Affected before 2.8.0-1.module_el8.5.0+2623+08a8ba32
  • rubygem-mysql2
    Fixed

    A version is affected if any line below covers it.

    • Affected before 0.4.10-4.module_el8.5.0+259+8cec6917
    • Affected before 0.4.10-4.module_el8.5.0+2625+ec418553
    • Affected before 0.5.2-1.module_el8.5.0+250+ba22dbf7
    • Affected before 0.5.2-1.module_el8.5.0+2623+08a8ba32
    • Affected before 0.5.3-1.module_el8.3.0+6147+d0dfc1e4
    • Affected before 0.5.3-1.module_el8.4.0+2399+4e3a532a
    • Affected before 0.5.3-1.module_el8.5.0+118+1ab773e1
  • rubygem-mysql2-doc
    Fixed

    A version is affected if any line below covers it.

    • Affected before 0.4.10-4.module_el8.5.0+259+8cec6917
    • Affected before 0.4.10-4.module_el8.5.0+2625+ec418553
    • Affected before 0.5.2-1.module_el8.5.0+250+ba22dbf7
    • Affected before 0.5.2-1.module_el8.5.0+2623+08a8ba32
    • Affected before 0.5.3-1.module_el8.3.0+6147+d0dfc1e4
    • Affected before 0.5.3-1.module_el8.4.0+2399+4e3a532a
    • Affected before 0.5.3-1.module_el8.5.0+118+1ab773e1
  • rubygem-pg
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1.0.0-2.module_el8.5.0+259+8cec6917
    • Affected before 1.0.0-2.module_el8.5.0+2625+ec418553
    • Affected before 1.1.4-1.module_el8.5.0+250+ba22dbf7
    • Affected before 1.1.4-1.module_el8.5.0+2623+08a8ba32
    • Affected before 1.2.3-1.module_el8.3.0+6147+d0dfc1e4
    • Affected before 1.2.3-1.module_el8.4.0+2399+4e3a532a
    • Affected before 1.2.3-1.module_el8.5.0+118+1ab773e1
  • rubygem-pg-doc
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1.0.0-2.module_el8.5.0+259+8cec6917
    • Affected before 1.0.0-2.module_el8.5.0+2625+ec418553
    • Affected before 1.1.4-1.module_el8.5.0+250+ba22dbf7
    • Affected before 1.1.4-1.module_el8.5.0+2623+08a8ba32
    • Affected before 1.2.3-1.module_el8.3.0+6147+d0dfc1e4
    • Affected before 1.2.3-1.module_el8.4.0+2399+4e3a532a
    • Affected before 1.2.3-1.module_el8.5.0+118+1ab773e1

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Arch Linux

  • gitlab
    Fixed in 13.10.3-1
  • ruby
    Fixed in 3.0.1-1
  • ruby-rexml
    Fixed in 3.2.5-1

Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.

CloudLinux 8

  • rubygem-abrt
    Fixed

    A version is affected if any line below covers it.

    • Affected before 0.3.0-4.module_el8.5.0+259+8cec6917
    • Affected before 0.3.0-4.module_el8.5.0+2623+08a8ba32
    • Affected before 0.3.0-4.module_el8.5.0+2625+ec418553
    • Affected before 0.4.0-1.module_el8.3.0+6147+d0dfc1e4
    • Affected before 0.4.0-1.module_el8.4.0+2399+4e3a532a
    • Affected before 0.4.0-1.module_el8.5.0+118+1ab773e1
  • rubygem-abrt-doc
    Fixed

    A version is affected if any line below covers it.

    • Affected before 0.3.0-4.module_el8.5.0+259+8cec6917
    • Affected before 0.3.0-4.module_el8.5.0+2623+08a8ba32
    • Affected before 0.3.0-4.module_el8.5.0+2625+ec418553
    • Affected before 0.4.0-1.module_el8.3.0+6147+d0dfc1e4
    • Affected before 0.4.0-1.module_el8.4.0+2399+4e3a532a
    • Affected before 0.4.0-1.module_el8.5.0+118+1ab773e1
  • rubygem-bson
    Fixed

    A version is affected if any line below covers it.

    • Affected before 4.3.0-2.module_el8.5.0+259+8cec6917
    • Affected before 4.3.0-2.module_el8.5.0+2625+ec418553
    • Affected before 4.5.0-1.module_el8.5.0+250+ba22dbf7
    • Affected before 4.5.0-1.module_el8.5.0+2623+08a8ba32
    • Affected before 4.8.1-1.module_el8.3.0+6147+d0dfc1e4
    • Affected before 4.8.1-1.module_el8.4.0+2399+4e3a532a
    • Affected before 4.8.1-1.module_el8.5.0+117+35d1289b
  • rubygem-bson-doc
    Fixed

    A version is affected if any line below covers it.

    • Affected before 4.3.0-2.module_el8.5.0+259+8cec6917
    • Affected before 4.3.0-2.module_el8.5.0+2625+ec418553
    • Affected before 4.5.0-1.module_el8.5.0+250+ba22dbf7
    • Affected before 4.5.0-1.module_el8.5.0+2623+08a8ba32
    • Affected before 4.8.1-1.module_el8.3.0+6147+d0dfc1e4
  • rubygem-mongo
    Fixed

    A version is affected if any line below covers it.

    • Affected before 2.11.3-1.module_el8.3.0+6147+d0dfc1e4
    • Affected before 2.5.1-2.module_el8.5.0+259+8cec6917
    • Affected before 2.5.1-2.module_el8.5.0+2625+ec418553
    • Affected before 2.8.0-1.module_el8.5.0+250+ba22dbf7
    • Affected before 2.8.0-1.module_el8.5.0+2623+08a8ba32
  • rubygem-mongo-doc
    Fixed

    A version is affected if any line below covers it.

    • Affected before 2.11.3-1.module_el8.3.0+6147+d0dfc1e4
    • Affected before 2.5.1-2.module_el8.5.0+259+8cec6917
    • Affected before 2.5.1-2.module_el8.5.0+2625+ec418553
    • Affected before 2.8.0-1.module_el8.5.0+250+ba22dbf7
    • Affected before 2.8.0-1.module_el8.5.0+2623+08a8ba32
  • rubygem-mysql2
    Fixed

    A version is affected if any line below covers it.

    • Affected before 0.4.10-4.module_el8.5.0+259+8cec6917
    • Affected before 0.4.10-4.module_el8.5.0+2625+ec418553
    • Affected before 0.5.2-1.module_el8.5.0+250+ba22dbf7
    • Affected before 0.5.2-1.module_el8.5.0+2623+08a8ba32
    • Affected before 0.5.3-1.module_el8.3.0+6147+d0dfc1e4
    • Affected before 0.5.3-1.module_el8.4.0+2399+4e3a532a
    • Affected before 0.5.3-1.module_el8.5.0+118+1ab773e1
  • rubygem-mysql2-doc
    Fixed

    A version is affected if any line below covers it.

    • Affected before 0.4.10-4.module_el8.5.0+259+8cec6917
    • Affected before 0.4.10-4.module_el8.5.0+2625+ec418553
    • Affected before 0.5.2-1.module_el8.5.0+250+ba22dbf7
    • Affected before 0.5.2-1.module_el8.5.0+2623+08a8ba32
    • Affected before 0.5.3-1.module_el8.3.0+6147+d0dfc1e4
    • Affected before 0.5.3-1.module_el8.4.0+2399+4e3a532a
    • Affected before 0.5.3-1.module_el8.5.0+118+1ab773e1
  • rubygem-pg
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1.0.0-2.module_el8.5.0+259+8cec6917
    • Affected before 1.0.0-2.module_el8.5.0+2625+ec418553
    • Affected before 1.1.4-1.module_el8.5.0+250+ba22dbf7
    • Affected before 1.1.4-1.module_el8.5.0+2623+08a8ba32
    • Affected before 1.2.3-1.module_el8.3.0+6147+d0dfc1e4
    • Affected before 1.2.3-1.module_el8.4.0+2399+4e3a532a
    • Affected before 1.2.3-1.module_el8.5.0+118+1ab773e1
  • rubygem-pg-doc
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1.0.0-2.module_el8.5.0+259+8cec6917
    • Affected before 1.0.0-2.module_el8.5.0+2625+ec418553
    • Affected before 1.1.4-1.module_el8.5.0+250+ba22dbf7
    • Affected before 1.1.4-1.module_el8.5.0+2623+08a8ba32
    • Affected before 1.2.3-1.module_el8.3.0+6147+d0dfc1e4
    • Affected before 1.2.3-1.module_el8.4.0+2399+4e3a532a
    • Affected before 1.2.3-1.module_el8.5.0+118+1ab773e1

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 11

  • ruby2.7
    Fixed in 2.7.3-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 16.04 LTS

  • ruby2.3
    Fixed in 2.3.1-2~ubuntu16.04.16

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • ruby2.5
    Fixed in 2.5.1-1ubuntu1.9

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • ruby2.7
    Fixed in 2.7.0-5ubuntu1.4

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.