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CVE-2026-86140 is a stack-based buffer overflow in libxml2 versions before 2.15.4. The flaw is in xmlSnprintfElements in valid.c, where unsafe strcat-based concatenation can overflow a stack-resident buffer while handling XML elements. The resulting memory corruption can crash an affected application or potentially enable arbitrary code execution in the context of the application using libxml2.
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No public exploit code observed for this vulnerability.
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20 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability addressed by the Oracle Linux ELSA-2026-71641 update for libxml2-related packages on Oracle Linux 8.
A stack-based buffer-overflow vulnerability in libxml2's xmlSnprintfElements function that can result in arbitrary code execution.
A referenced vulnerability addressed by the Oracle Linux libxml2 package update; no technical flaw details are provided.
A vulnerability addressed by the referenced Oracle Linux security update affecting listed libxml2-related packages.
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.