Low severity · published Jan 23, 2026
CVE-2026-24515
In libexpat before 2.7.4, XML_ExternalEntityParserCreate does not copy unknown encoding handler user data
2.5
CVSS
0.2%
EPSS
No
On KEV
Description
In libexpat before 2.7.4, XML_ExternalEntityParserCreate does not copy unknown encoding handler user data.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
Attack vector
Local
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 8% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
libexpat · libexpat project
before 2.7.4 · source: vendor, NVD
RR
RUGGEDCOM RST2428P · Siemens
before V4.0 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-24515
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-24515
Issue Tracking
https://github.com/libexpat/libexpat/pull/1131
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/html/ssa-253495.html
More from libexpat
9.8
CVE-2024-45492
An issue was discovered in libexpat before 2.6.3
9.8
CVE-2024-45491
An issue was discovered in libexpat before 2.6.3
9.8
CVE-2022-25315
In Expat (aka libexpat) before 2.4.5, there is an integer overflow in storeRawNames
9.8
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
9.8
CVE-2022-25236
xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator characters into namespace URIs