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
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
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%
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-2024-8176High· 7.5A stack overflow vulnerability exists in the libexpat library due to the way it handles recursive entity expansion in XML documents
CVE-2026-76956Medium· 5.9In 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.
CVE-2026-76957Medium· 4.9libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks
CVE-2026-92365Medium· 4.3A vulnerability was found in vllm-project vllm up to 0.29.0
CVE-2026-93990High· 7.5Expat through 2.8.4 fails to validate low surrogates following high surrogates in UTF-16 input, allowing malformed UTF-16 sequences to be accepted