PT-2026-77055
CVE-2026-66046
·
Published
2026-08-18
·
Updated
2026-10-27
Description by
CVSS 4.0
8.7
HighMetricsAV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Name of the Vulnerable Software and Affected Versions
Expat versions prior to 2.8.4
Description
A denial of service issue exists due to quadratic algorithmic complexity within the
storeAtts() function in xmlparse.c. When processing N specified attributes with non-normalized values, the system triggers an O(N^2) linear scan of elementType->defaultAtts to determine CDATA status. A remote unauthenticated attacker can cause excessive CPU consumption by providing a single well-formed XML document of a few megabytes to an application parsing untrusted XML.Recommendations
Update to version 2.8.4 or later.
Exploitability
Exploit
Fix
Impacts
Vendors
Affected products
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