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CVE-2026-63384 is an integer-conversion vulnerability in Libevent's tagged-RPC processing code in event_tagging.c. Before Libevent 2.1.13 and 2.2.2-alpha, evtag_unmarshal_header uses evtag_decode_int to decode an attacker-controlled unsigned 32-bit payload length but returns the result as a signed int. Payload lengths greater than INT_MAX may become negative or truncated. evtag_unmarshal_string can subsequently use the converted length for allocation sizing, resulting in a wrapped large allocation request and denial of service.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
28 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability addressed by the Miracle Linux AXSA-2026-1863 update for libevent packages; the content provides no technical flaw description.
A vulnerability addressed by the Alma Linux 10 libevent security advisory. The content does not provide vulnerability-specific technical details.
A vulnerability addressed by the Oracle Linux 10 libevent package advisory; no technical flaw details are provided.
A Libevent denial-of-service flaw caused by an integer conversion error in evtag_unmarshal_header.
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.