What’s Vulnerable › Vulnerabilities

CVE-2022-27191: golang.org/x/crypto/ssh Denial of service via crafted Signer

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-03-18 · updated 2026-06-17

Description

The golang.org/x/crypto/ssh package before 0.0.0-20220314234659-1baeb1ce4c0b for Go allows an attacker to crash a server in certain circumstances involving AddHostKey.

Affected products

• Fedoraproject Extra Packages For Enterprise Linux: 8.0
• Fedoraproject Fedora: 34, 35, 36
• Golang Ssh: before 0.0.0-20220314234659-1baeb1ce4c0b — fixed in 0.0.0-20220314234659-1baeb1ce4c0b
• Red Hat Advanced Cluster Management for Kubernetes 2: 2.0
• Golang.Org/X/Crypto: before 0.0.0-20220314234659-1baeb1ce4c0b — fixed in 0.0.0-20220314234659-1baeb1ce4c0b

How to fix

Upgrade to a fixed version: Golang Ssh 0.0.0-20220314234659-1baeb1ce4c0b; Golang.Org/X/Crypto 0.0.0-20220314234659-1baeb1ce4c0b. Check the vendor advisory for mitigations.

References

• https://groups.google.com/g/golang-announce
• https://groups.google.com/g/golang-announce/c/-cp44ypCT5s
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DLUJZV3HBP56ADXU6QH2V7RNYUPMVBXQ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EZ3S7LB65N54HXXBCB67P4TTOHTNPP5O/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HHGBEGJ54DZZGTXFUQNS7ZIG3E624YAF/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J5WPM42UR6XIBQNQPNQHM32X7S4LJTRX/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QTFOIDHQRGNI4P6LYN6ILH5G443RYYKB/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RQXU752ALW53OJAF5MG3WMR5CCZVLWW6/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YHYRQB7TRMHDB3NEHW5XBRG7PPMUTPGV/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z55VUVGO7E5PJFXIOVAY373NZRHBNCI5/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZFUNHFHQVJSADNH7EZ3B53CYDZVEEPBP/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZQNPPQWSTP2IX7SHE6TS4SP4EVMI5EZK/

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