Kurz gesagt
- CVE-2026-27145 ist eine Schwachstelle (MITTEL (CVSS 6.5)) in stdlib.
- Wahrscheinlichkeit einer Ausnutzung in den nächsten 30 Tagen (EPSS): 0.59%, höher als bei 48.3% aller Schwachstellen.
- Abhilfe: auf 1.26.4, 1.25.11 oder neuer aktualisieren.
| Package | Affected versions | Patched versions |
|---|
| stdlib Go | ≥ 1.26.0-0, < 1.26.4< 1.25.11
| 1.26.41.25.11
|
Description
(*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.
NVD description
(*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.
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