CVE-2026-45186Low· 2.9▾ SunlitIn libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.
▾ Sunlit zone — Low / medium · no exploitation signal
impact 16 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Sep 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.5%
0.5% → 0.6%
In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.
libexpat < 2.8.1Upgrade past the affected range:
libexpat 2.8.1Connected by shared product, vendor, weakness, or advisory.
CVE-2026-66046High· 7.5Expat through 2.8.3 contains a denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts() function in xmlparse.c, where processing N specified attributes with non-normalized values triggers an O(N^2) li…
CVE-2026-113351Medium· 5.9libexpat 2.7.2 through 2.9.0 Denial of Service via XML_ParserReset
CVE-2026-77214High· 8.2libexpat before commit 13c5f63 contains a heap buffer over-read vulnerability in xmlparse.c
CVE-2026-102633Medium· 5.9libexpat versions 2.7.2 through 2.8.5 contain an integer overflow vulnerability in expat_realloc() function on 32-bit platforms when computing allocation sizes
CVE-2026-93990High· 7.5Expat before 2.8.5 fails to validate that a high surrogate in UTF-16 input is followed by a low surrogate, allowing malformed UTF-16 sequences to be accepted
CVE-2024-8176High· 7.5A stack overflow vulnerability exists in the libexpat library due to the way it handles recursive entity expansion in XML documents