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In libexpat before 2.2.8, crafted XML input could fool the parser into changing from DTD parsing to document parsing too early; a consecutive call to XML_GetCurrentLineNumber (or XML_GetCurrentColumnNumber) then resulted in a heap-based buffer over-read.

CVE-2019-15903 is a medium-severity vulnerability affecting libexpat versions prior to 2.2.8, a widely used XML parsing library. The flaw arises from the parser's handling of crafted XML input that causes an early transition from Document Type Definition (DTD) parsing to document parsing. This premature switch leads to a state where subsequent calls to functions such as XML_GetCurrentLineNumber or XML_GetCurrentColumnNumber trigger a heap-based buffer over-read. Specifically, the parser reads beyond the allocated memory buffer, which can cause application instability, crashes, or potentially expose sensitive memory contents. The vulnerability is classified under CWE-125 (Out-of-bounds Read). Exploitation requires no privileges but does require user interaction, such as processing malicious XML input. The CVSS v3.1 base score is 6.5, reflecting a network attack vector with low attack complexity, no privileges required, user interaction needed, unchanged scope, no impact on confidentiality or integrity, but high impact on availability due to potential crashes or denial of service. No known exploits are currently reported in the wild, and no vendor or product specifics are provided, but libexpat is commonly embedded in many software products and systems that process XML data.

Detailed information about CVE-2019-15903: n/a in n/a affecting n/a n/a. Get real-time updates, technical details, and mitigation strategies.

CVE-2019-15903: n/a in n/a - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2019-15903: n/a in n/a

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