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CVE-2026-63387 is an off-by-one stack buffer overflow in Libevent's evdns DNS-response formatting logic. In affected releases prior to 2.1.13 and 2.2.2-alpha, dnsname_to_labels can process a name-bearing DNS record at the boundary of the 64 KB stack buffer allocated by evdns_server_request_format_response. Its final-label bounds check allows the label position plus label length plus terminator to equal the buffer length, after which it writes a terminating NUL byte one byte beyond the buffer. PTR, CNAME, MX, NS, and SOA records can carry the triggering name data.
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What an attacker gets, and what they’ve been doing with it.
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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.
24 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 access, low attack complexity, no authentication requirement, partial confidentiality and integrity impact, and complete availability impact according to the supplied CVSS v2 vector.
A remotely reachable, low-complexity libevent vulnerability addressed by the Alma Linux 10 advisory. The cited CVSS v2 vector indicates partial confidentiality and integrity impact and complete availability impact.
A remotely accessible Oracle Linux 10 libevent vulnerability with low attack complexity and no authentication in the supplied CVSS v2 vector; the technical flaw is not described.
An off-by-one stack buffer overflow in Libevent that can cause denial of service or data corruption.
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.