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CVE-2025-61729 is a resource-exhaustion vulnerability in Go's crypto/x509 package. HostnameError.Error() constructs an error message without limiting the number of certificate hostnames included. Repeated string concatenation causes quadratic runtime during message construction. An attacker-controlled certificate can therefore trigger excessive resource consumption when the resulting hostname error is formatted, potentially causing denial of service in an affected application.
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No public exploit code observed for this vulnerability.
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205 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Go's HostnameError.Error() constructs error messages without limiting the number of hostnames and uses repeated string concatenation with quadratic runtime. A malicious certificate can therefore trigger excessive resource consumption.
A Go crypto/x509 denial-of-service vulnerability in which a crafted certificate can cause excessive resource consumption.
A Go crypto/x509 denial-of-service vulnerability involving excessive resource consumption when processing a crafted certificate.
A Go crypto/x509 denial-of-service vulnerability in which a crafted certificate can cause excessive resource consumption.
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.