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CVE-2026-63385 affects Libevent versions before 2.1.13 and versions from 2.2.0-alpha before 2.2.2-alpha. Two HTTP parsing weaknesses in http.c produce inconsistent interpretation of HTTP data. evhttp_decode_uri_internal decodes percent-encoded NUL bytes into literal NUL characters, allowing subsequent C string operations to truncate a URI path and potentially bypass validation performed on its encoded representation. Separately, evhttp_header_is_valid_value accepts obsolete folded header values containing carriage-return or line-feed characters, enabling parsing differentials between Libevent and an HTTP proxy. The header-folding flaw is fixed in 2.1.13 and 2.2.2-alpha; the available patch review does not clearly establish that the URI NUL-truncation condition is remediated.
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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.
29 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Miracle Linux libevent-package vulnerability with network attack vector, no required privileges or user interaction, and high vulnerable-system confidentiality and integrity impact according to the supplied CVSS v4 vector.
A network-reachable vulnerability in libevent addressed by the Alma Linux 10 security advisory. Its cited CVSS v4 vector indicates high vulnerable-system confidentiality and integrity impact, with lower availability impact and potential subsequent-system impacts.
A network-reachable Oracle Linux 10 libevent vulnerability with no privileges or user interaction required according to the provided CVSS v4 vector; the specific technical flaw is not described.
Libevent HTTP header handling flaws that create a risk of access-control bypass.
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.