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CVE-2026-56854— Source-address critical option not enforced for non-public-key auth callbacks in golang.org/x/crypto/ssh

Quick assessment

Affected
golang.org/x/crypto golang.org/x/crypto/ssh
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

golang.org/x/crypto golang.org/x/crypto/ssh是golang.org/x/crypto组织的SSH加密库。 golang.org/x/crypto/ssh 0.55.0之前版本存在授权问题漏洞，该漏洞源于认证回调返回的Permissions中的source-address关键选项未对所有认证回调进行验证，导致源地址限制被静默忽略。

AI Predicted 4.3 Difficulty: Moderate EPSS 0.33% · P26

Possible ATT&CK Techniques 1 AI

T1078.002 · Domain Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
golang.org/x/crypto golang.org/x/crypto/ssh < 0.55.0 affected
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I. Basic Information for CVE-2026-56854

Vulnerability Information
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Vulnerability Title
Source-address critical option not enforced for non-public-key auth callbacks in golang.org/x/crypto/ssh
Source: CVE Program / CVE List V5
Vulnerability Description
The source-address critical option in the Permissions returned by an authentication callback was only enforced for the PublicKeyCallback and VerifiedPublicKeyCallback paths, extending the fix for CVE-2026-46595. Permissions returned by the PasswordCallback, KeyboardInteractiveCallback, NoClientAuthCallback, and GSSAPIWithMICConfig.AllowLogin callbacks were not validated against the client's remote address, so a source-address restriction set by those callbacks was silently ignored. The check is now applied to the Permissions returned by any authentication callback.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
golang.org/x/crypto/ssh 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
golang.org/x/crypto golang.org/x/crypto/ssh是golang.org/x/crypto组织的SSH加密库。 golang.org/x/crypto/ssh 0.55.0之前版本存在授权问题漏洞，该漏洞源于认证回调返回的Permissions中的source-address关键选项未对所有认证回调进行验证，导致源地址限制被静默忽略。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
golang.org/x/crypto golang.org/x/crypto/ssh 0 ~ 0.55.0 -

II. Public POCs for CVE-2026-56854

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III. Intelligence Information for CVE-2026-56854

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Patches & Fixes for CVE-2026-56854 (1)

Vendor Advisories for CVE-2026-56854 (1)

Other References for CVE-2026-56854 (1)

IV. Related Vulnerabilities

Same product: golang.org/x/crypto/ssh
Same vendor: golang.org/x/crypto

V. Comments for CVE-2026-56854

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