CVE-2025-61729None▾ SunlitExcessive resource consumption when printing error string for host certificate validation in crypto/x509
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 29.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
0.4%
0.4% → 0.5%
Within HostnameError.Error(), when constructing an error string, there is no limit to the number of hosts that will be printed out. Furthermore, the error string is constructed by repeated string concatenation, leading to quadratic runtime. Therefore, a certificate provided by a malicious actor can result in excessive resource consumption.
stdlib >= 1.25.0, < 1.25.5Upgrade to a patched release:
stdlib 1.25.5Connected by shared product, vendor, weakness, or advisory.
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