CVE-2026-32776
libexpat before 2.7.5 allows a NULL pointer dereference with empty external parameter entity content.
02 Description
libexpat before 2.7.5 allows a NULL pointer dereference with empty external parameter entity content.
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.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.16% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 5.5% of scored records. A rank, not a probability.
- NVD base score
- 5.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-07-14.
- 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
- 2026-03-16 06:54Z7 MO AGO
- Last updated
- 2026-10-15 01:18Z14 DAYS AGO
- Reserved
- 2026-03-16
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 4.0)
- CNA CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Weaknesses
- CWE-476NULL Pointer DereferenceBase
- Data version
- 5.2
- Document digest
- 9e5c56071b5d6149319293cabf8d0610f491a2d09b2970faaee5b13ec99cd2f6
05 Affected products
06 References
- github.comhttps://github.com/libexpat/libexpat/pull/1158
- github.comhttps://github.com/libexpat/libexpat/pull/1159
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-082556.html
07 Fixed in
Debian 12
- expat Fixed in 2.5.0-1+deb12u4
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- expat Fixed in 2.8.2-1~deb13u1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- expat Fixed in 2.7.5-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- cadaver No fix yet
- gdcm No fix yet
- insighttoolkit4 No fix yet
- matanza No fix yet
- smart No fix yet
- tdom 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 18.04 LTS
- cadaver No fix yet
- gdcm No fix yet
- insighttoolkit4 No fix yet
- matanza No fix yet
- smart No fix yet
- tdom No fix yet
- vnc4 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 20.04 LTS
- cadaver No fix yet
- insighttoolkit4 No fix yet
- matanza No fix yet
- tdom 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
- cadaver No fix yet
- expat Fixed in 2.4.7-1ubuntu0.8
- insighttoolkit4 No fix yet
- matanza No fix yet
- tdom 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 24.04 LTS
- cadaver No fix yet
- expat Fixed in 2.6.1-2ubuntu0.5
- matanza No fix yet
- tdom 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 25.10
- cadaver No fix yet
- expat No fix yet
- matanza No fix yet
- swish-e No fix yet
- tdom No fix yet
- wbxml2 No fix yet
- xmlrpc-c 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
- cadaver No fix yet
- expat Fixed in 2.7.4-1ubuntu0.1
- matanza No fix yet
- tdom No fix yet
- wbxml2 No fix yet
- xmlrpc-c 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
- cadaver No fix yet
- matanza No fix yet
- swish-e No fix yet
- tdom No fix yet
- wbxml2 No fix yet
- xmlrpc-c 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 No fix yet
- expat Fixed in 2.1.0-4ubuntu1.4+esm12Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro
- vnc4 No fix yet
- vtk No fix yet
- xmlrpc-c No fix yet
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 No fix yet
- cableswig No fix yet
- coin3 No fix yet
- expat Fixed in 2.1.0-7ubuntu0.16.04.5+esm13Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro
- libxmltok No fix yet
- swish-e No fix yet
- vnc4 No fix yet
- vtk No fix yet
- xmlrpc-c No fix yet
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 No fix yet
- expat Fixed in 2.2.5-3ubuntu0.9+esm4Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- libxmltok No fix yet
- swish-e No fix yet
- xmlrpc-c No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 20.04 LTS
- expat Fixed in 2.2.9-1ubuntu0.8+esm2Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- libxmltok No fix yet
- swish-e No fix yet
- xmlrpc-c No fix yet
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 No fix yet
- swish-e No fix yet
- xmlrpc-c No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 24.04 LTS
- libxmltok No fix yet
- swish-e No fix yet
- xmlrpc-c No fix yet
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 No fix yet
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.