What’s Vulnerable › Vulnerabilities

CVE-2025-58181: Unbounded memory consumption in golang.org/x/crypto/ssh

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-11-19 · updated 2026-10-18
• Weakness: CWE-770

Description

SSH servers parsing GSSAPI authentication requests do not validate the number of mechanisms specified in the request, allowing an attacker to cause unbounded memory consumption.

Affected products

• golang.org/x/crypto/ssh: before 0.45.0 — fixed in 0.45.0
• Golang.Org/X/Crypto: before 0.45.0 — fixed in 0.45.0

How to fix

Upgrade to a fixed version: golang.org/x/crypto/ssh 0.45.0; Golang.Org/X/Crypto 0.45.0. Check the vendor advisory for mitigations.

References

• https://go.dev/cl/721961
• https://go.dev/issue/76363
• https://groups.google.com/g/golang-announce/c/w-oX3UxNcZA
• https://pkg.go.dev/vuln/GO-2025-4134

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