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CVE-2025-59375 is a denial-of-service vulnerability in libexpat, the XML parsing library used by Expat. In versions prior to 2.7.2, a small specially crafted XML document can trigger disproportionately large dynamic memory allocations during parsing. The flaw stems from insufficient limits and checks around resource allocation in affected parsing code paths, allowing attacker-controlled input to drive excessive heap growth far beyond what would be expected from the size of the submitted document. Because libexpat is widely embedded in operating systems, applications, frameworks, and appliances, the issue can propagate to many downstream products that parse untrusted XML through vulnerable libexpat builds.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
40 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability affecting IBM HTTP Server configurations with mod_dav loaded.
Sandbox escape via logic flaw; fixed with improved checks.
A denial-of-service vulnerability in libexpat caused by insufficient controls on dynamic memory allocation when parsing crafted XML documents, leading to excessive heap allocation and resource exhaustion.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.