Libexpat Project: >> Libexpat Security Vulnerabilities
In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via crafted XML content.
CVSS Score
5.9
EPSS Score
0.003
Published
2026-08-20
libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.
CVSS Score
4.9
EPSS Score
0.001
Published
2026-08-20
xmlwf in libexpat before 2.8.2 has an integer overflow in endDoctypeDecl via NOTATION declarations.
CVSS Score
6.9
EPSS Score
0.001
Published
2026-06-21
libexpat before 2.8.2 does not consider XML_TOK_DATA_CHARS in doCdataSection and thus lacks handler call depth tracking for various calls from within handlers in cases of a policy violation. Thus, a use-after-free can occur. NOTE: this issue exists because of an incomplete fix for CVE-2026-50219.
CVSS Score
4.9
EPSS Score
0.002
Published
2026-06-21
libexpat before 2.8.2 has an integer overflow in copyString.
CVSS Score
6.9
EPSS Score
0.001
Published
2026-06-21
xmlwf in libexpat before 2.8.2 has an integer overflow for the output filename when -d outputDir is used.
CVSS Score
6.5
EPSS Score
0.001
Published
2026-06-21
xmlwf in libexpat before 2.8.2 has an integer overflow in resolveSystemId.
CVSS Score
6.9
EPSS Score
0.001
Published
2026-06-21
libexpat before 2.8.2 has an integer overflow in addBinding.
CVSS Score
6.9
EPSS Score
0.001
Published
2026-06-21
libexpat before 2.8.2 has an integer overflow in getAttributeId.
CVSS Score
6.9
EPSS Score
0.001
Published
2026-06-21
libexpat before 2.8.2 has an integer overflow in XML_ParseBuffer because it lacked a check that was present in XML_Parse.
CVSS Score
6.9
EPSS Score
0.001
Published
2026-06-21
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