CVE-2022-25235
xmltok_impl.c in Expat (aka libexpat) before 2.4.5 lacks certain validation of encoding, such as checks for whether a UTF-8 character is valid in a certain context.
02 Description
xmltok_impl.c in Expat (aka libexpat) before 2.4.5 lacks certain validation of encoding, such as checks for whether a UTF-8 character is valid in a certain context.
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
- Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
- EPSS probability
- 4.95% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 91.9% of scored records. A rank, not a probability.
- NVD base score
- 9.8 (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:H/I:H/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-10-14.
- Red Hat severity
- Important. 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
- 2022-02-16 00:40Z4 YR AGO
- Last updated
- 2026-10-14 16:01Z15 DAYS AGO
- Reserved
- 2022-02-16
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- Critical (CVSS 9.8)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- Data version
- 5.2
- Document digest
- 020b0b77a8ae70232a22771ac98e21c945be2f2d47915c3b4dfa23471ad672e7
05 Affected products
06 References
- github.comhttps://github.com/libexpat/libexpat/pull/562
- www.openwall.com[oss-security] 20220219 Expat 2.4.5 released, includes 5 security fixeshttp://www.openwall.com/lists/oss-security/2022/02/19/1
- www.debian.orgDSA-5085https://www.debian.org/security/2022/dsa-5085
- lists.fedoraproject.orgFEDORA-2022-04f206996bhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3UFRBA3UQVIQKXTBUQXDWQOVWNBKLERU/
- lists.fedoraproject.orgFEDORA-2022-3d9d67f558https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y27XO3JMKAOMQZVPS3B4MJGEAHCZF5OM/
- lists.debian.org[debian-lts-announce] 20220307 [SECURITY] [DLA 2935-1] expat security updatehttps://lists.debian.org/debian-lts-announce/2022/03/msg00007.html
- www.oracle.comhttps://www.oracle.com/security-alerts/cpuapr2022.html
- security.netapp.comhttps://security.netapp.com/advisory/ntap-20220303-0008/
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf
- security.gentoo.orgGLSA-202209-24https://security.gentoo.org/glsa/202209-24
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-484086.html
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-398330.html
07 Fixed in
AlmaLinux 8
- expat Fixed in 2.2.5-8.el8_6.2
- expat-devel Fixed in 2.2.5-8.el8_6.2
- firefox Fixed in 91.7.0-3.el8_5.alma
- mingw32-expat Fixed in 2.4.8-1.el8
- mingw64-expat Fixed in 2.4.8-1.el8
- thunderbird Fixed
A version is affected if any line below covers it.
- Affected before 91.7.0-2.el8_5.alma
- Affected before 91.7.0-2.el8_5.alma.plus
- xmlrpc-c-c++ Fixed in 1.51.0-5.el8_5.1
- xmlrpc-c-client++ Fixed in 1.51.0-5.el8_5.1
- xmlrpc-c-devel Fixed in 1.51.0-5.el8_5.1
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- expat Fixed in 2.2.5-8.el8_6.2
- expat-devel Fixed in 2.2.5-8.el8_6.2
- firefox Fixed in 91.7.0-3.el8_5.alma
- mingw32-expat Fixed in 2.4.8-1.el8
- mingw64-expat Fixed in 2.4.8-1.el8
- thunderbird Fixed
A version is affected if any line below covers it.
- Affected before 91.7.0-2.el8_5.alma
- Affected before 91.7.0-2.el8_5.alma.plus
- xmlrpc-c-c++ Fixed in 1.51.0-5.el8_5.1
- xmlrpc-c-client++ Fixed in 1.51.0-5.el8_5.1
- xmlrpc-c-devel Fixed in 1.51.0-5.el8_5.1
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 12
- expat Fixed in 2.4.5-1
- libxmltok No fix yet
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- expat Fixed in 2.4.5-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- expat Fixed in 2.4.5-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- insighttoolkit4 No fix yet
- matanza No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- expat Fixed in 2.2.5-3ubuntu0.4
- matanza No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- expat Fixed in 2.2.9-1ubuntu0.2
- matanza No fix yet
- wbxml2 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- firefox Fixed in 1:1snap1-0ubuntu1
- matanza No fix yet
- thunderbird No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- libxmltok Fixed in 1.2-4.1ubuntu1
- matanza No fix yet
- thunderbird No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 25.10
- matanza No fix yet
- swish-e No fix yet
- thunderbird No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.04 LTS
- matanza No fix yet
- thunderbird No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.10
- matanza No fix yet
- swish-e No fix yet
- thunderbird No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- coin3 Fixed in 3.1.4~abc9f50-4ubuntu2+esm2Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro
- expat Fixed in 2.1.0-4ubuntu1.4+esm4Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- xmlrpc-c Fixed in 1.33.06-0ubuntu1+esm1Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- ayttm Fixed in 0.6.3-3ubuntu0.1~esm1Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro
- cableswig Fixed in 0.1.0+git20150808-2ubuntu0.1~esm1Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro
- coin3 Fixed in 3.1.4~abc9f50+dfsg1-1ubuntu0.1~esm2Available with Ubuntu Pro: https://ubuntu.com/pro
- expat Fixed in 2.1.0-7ubuntu0.16.04.5+esm2Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- insighttoolkit Fixed in 3.20.1+git20120521-6ubuntu0.1~esm1Available with Ubuntu Pro: https://ubuntu.com/pro
- libxmltok Fixed in 1.2-3ubuntu0.16.04.1~esm2Available with Ubuntu Pro: https://ubuntu.com/pro
- swish-e Fixed in 2.4.7-4ubuntu0.1~esm1Available with Ubuntu Pro: https://ubuntu.com/pro
- xmlrpc-c Fixed in 1.33.14-1ubuntu1+esm1Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 18.04 LTS
- coin3 Fixed in 3.1.4~abc9f50+dfsg3-2ubuntu0.1~esm1Available with Ubuntu Pro: https://ubuntu.com/pro
- libxmltok Fixed in 1.2-4ubuntu0.18.04.1~esm1Available with Ubuntu Pro: https://ubuntu.com/pro
- swish-e Fixed in 2.4.7-5ubuntu1+esm1Available with Ubuntu Pro: https://ubuntu.com/pro
- xmlrpc-c Fixed in 1.33.14-8ubuntu0.18.04.1~esm1Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 20.04 LTS
- libxmltok Fixed in 1.2-4ubuntu0.20.04.1~esm1Available with Ubuntu Pro: https://ubuntu.com/pro
- swish-e Fixed in 2.4.7-6ubuntu0.1~esm1Available with Ubuntu Pro: https://ubuntu.com/pro
- xmlrpc-c Fixed in 1.33.14-8ubuntu0.20.04.1~esm1Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 22.04 LTS
- libxmltok Fixed in 1.2-4ubuntu0.22.04.1~esm1Available with Ubuntu Pro: https://ubuntu.com/pro
- swish-e Fixed in 2.4.7-6.1ubuntu0.1~esm1Available with Ubuntu Pro: https://ubuntu.com/pro
- xmlrpc-c Fixed in 1.33.14-10ubuntu0.1~esm1Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 24.04 LTS
- swish-e Fixed in 2.4.7-6.2ubuntu0.1~esm1Available with Ubuntu Pro: https://ubuntu.com/pro
- xmlrpc-c Fixed in 1.33.14-12ubuntu0.1~esm1Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 26.04 LTS
- swish-e Fixed in 2.4.7-7.1ubuntu0.1~esm1Available with Ubuntu Pro: https://ubuntu.com/pro
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.