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CVE-2026-63388 is a heap-based out-of-bounds write in Libevent versions earlier than 2.1.13 and versions from 2.2.0-alpha before 2.2.2-alpha. In the buffered-socket AF_UNIX connection-address handling path, bufferevent_socket_set_conn_address_ copies a kernel-supplied peer sockaddr into the substantially smaller bufferevent_private.conn_address field. Release builds compiled with NDEBUG disable the assertion intended to guard the copy length. The evhttp accept path can therefore supply an AF_UNIX sockaddr of up to 110 bytes to a 28-byte destination, overwriting adjacent heap contents, including an adjacent dns_request pointer.
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Patch, then assume compromise.
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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.
25 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Miracle Linux libevent-package vulnerability with local attack vector, low attack complexity, no required privileges or user interaction, and high confidentiality, integrity, and availability impact according to the supplied CVSS v3 vector.
A locally exploitable, low-complexity libevent vulnerability addressed by the Alma Linux 10 advisory. The cited CVSS v3 vector indicates high confidentiality, integrity, and availability impact without requiring privileges or user interaction.
A local Oracle Linux 10 libevent vulnerability requiring neither privileges nor user interaction according to the supplied CVSS v3 vector; the technical flaw is not described.
A Libevent heap out-of-bounds write in AF_UNIX handling that can permit arbitrary code execution.
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.