PT-2026-95874 · Expat+1 · Expat+1
CVSS v4.0
8.7
High
| Vector | AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N |
Name of the Vulnerable Software and Affected Versions
Expat versions prior to 2.8.5
Description
The software fails to validate low surrogates following high surrogates in UTF-16 input, which allows malformed UTF-16 sequences to be accepted. This behavior enables attackers to craft UTF-16 encoded XML containing lone high surrogates that consume subsequent code units. Consequently, markup characters can be hidden from the parser, facilitating XML injection attacks.
Recommendations
Update to version 2.8.5 or later.
Exploit
Fix
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Weakness Enumeration
Related Identifiers
Affected Products
Expat
Rocky Linux