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CVE-2026-27145Published

Inefficient candidate hostname parsing in crypto/x509

Exact source revision recorded 23 Oct 2026 15:48:27 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

cve-program · CVE-2026-27145

Published

(*x509.Certificate).VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name (SAN) entries. This caused strings.Split(host, ".") to execute repeatedly on the same input hostname. With a large DNS SAN list, verification costs scaled quadratically based on the number of SAN entries multiplied by the hostname's label count. Because x509.Verify validates hostnames before building the certificate chain, this overhead occurred even for untrusted certificates.

Source published
2 Jun 2026 22:01:36 UTC
Source modified
18 Sep 2026 12:04:41 UTC
Observed here
23 Oct 2026 15:48:27 UTC
Source terms
CVE Program Terms of Use

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Sources read 12 Nov 12:12 UTC · 274 of 275 readable · 272 fully read · documentation 469/469 current

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