Update module golang.org/x/crypto to v0.56.0 [SECURITY] (release-v0.20) - #638
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This PR contains the following updates:
v0.32.0→v0.56.0golang.org/x/crypto Vulnerable to Denial of Service (DoS) via Slow or Incomplete Key Exchange
CVE-2025-22869 / GHSA-hcg3-q754-cr77 / GO-2025-3487
More information
Details
SSH servers which implement file transfer protocols are vulnerable to a denial of service attack from clients which complete the key exchange slowly, or not at all, causing pending content to be read into memory, but never transmitted.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
Potential denial of service in golang.org/x/crypto
CVE-2025-22869 / GHSA-hcg3-q754-cr77 / GO-2025-3487
More information
Details
SSH servers which implement file transfer protocols are vulnerable to a denial of service attack from clients which complete the key exchange slowly, or not at all, causing pending content to be read into memory, but never transmitted.
Severity
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
Potential denial of service in golang.org/x/crypto/ssh/agent
CVE-2025-47913 / GHSA-56w8-48fp-6mgv / GO-2025-4116
More information
Details
SSH clients receiving SSH_AGENT_SUCCESS when expecting a typed response will panic and cause early termination of the client process.
Severity
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
golang.org/x/crypto/ssh/agent vulnerable to panic if message is malformed due to out of bounds read
CVE-2025-47914 / GHSA-f6x5-jh6r-wrfv / GO-2025-4135
More information
Details
SSH Agent servers do not validate the size of messages when processing new identity requests, which may cause the program to panic if the message is malformed due to an out of bounds read.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
golang.org/x/crypto/ssh allows an attacker to cause unbounded memory consumption
CVE-2025-58181 / GHSA-j5w8-q4qc-rx2x / GO-2025-4134
More information
Details
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.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
Unbounded memory consumption in golang.org/x/crypto/ssh
CVE-2025-58181 / GHSA-j5w8-q4qc-rx2x / GO-2025-4134
More information
Details
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.
Severity
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
Malformed constraint may cause denial of service in golang.org/x/crypto/ssh/agent
CVE-2025-47914 / GHSA-f6x5-jh6r-wrfv / GO-2025-4135
More information
Details
SSH Agent servers do not validate the size of messages when processing new identity requests, which may cause the program to panic if the message is malformed due to an out of bounds read.
Severity
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
golang.org/x/crypto vulnerable to invoking bypass of certificate restrictions
CVE-2026-39828 / GHSA-45gg-vh54-h5m9 / GO-2026-5014
More information
Details
When an SSH server authentication callback returned PartialSuccessError with non-nil Permissions, those permissions were silently discarded, potentially dropping certificate restrictions such as force-command after a second factor succeeded. Returning non-nil Permissions with PartialSuccessError now results in a connection error.
Severity
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:LReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
golang.org/x/crypto vulnerable to auth bypass via unenforced @revoked status
CVE-2026-42508 / GHSA-5cgq-3rg8-m6cv / GO-2026-5021
More information
Details
Previously, a revoked 'SignatureKey' belonging to a CA was not correctly checked for revocation. Now, both the 'key' and 'key.SignatureKey' are checked for @revoked.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
golang.org/x/crypto is vulnerable to invoking server panic during CheckHostKey/Authenticate flow
CVE-2026-39835 / GHSA-78mq-xcr3-xm33 / GO-2026-5015
More information
Details
SSH servers which use CertChecker as a public key callback without setting IsUserAuthority or IsHostAuthority could be caused to panic by a client presenting a certificate. CertChecker now returns an error instead of panicking when these callbacks are nil.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
golang.org/x/crypto: FIDO/U2F security key physical presence check can be bypassed
CVE-2026-39831 / GHSA-89gr-r52h-f8rx / GO-2026-5019
More information
Details
The Verify() method for FIDO/U2F security key types (sk-ecdsa-sha2-nistp256@openssh.com, sk-ssh-ed25519@openssh.com) did not check the User Presence flag. Signatures generated without physical touch were accepted, allowing unattended use of a hardware security key. To restore the previous behavior, return a "no-touch-required" extension in Permissions.Extensions from PublicKeyCallback.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
golang.org/x/crypto: Invoking pathological inputs can lead to client panic
CVE-2026-46598 / GHSA-9m57-25v3-79x9 / GO-2026-5033
More information
Details
For certain crafted inputs, a 'ed25519.PrivateKey' was created by casting malformed wire bytes, leading to a panic when used.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
golang.org/x/crypto doesn't drop invoking agent constraints when forwarding keys
CVE-2026-39832 / GHSA-f5wc-c3c7-36mc / GO-2026-5006
More information
Details
When adding a key to a remote agent constraint extensions such as restrict-destination-v00@openssh.com were not serialized in the request. Destination restrictions were silently stripped when forwarding keys, allowing unrestricted use of the key on the remote host. The client now serializes all constraint extensions. Additionally, the in-memory keyring returned by NewKeyring() now rejects keys with unsupported constraint extensions instead of silently ignoring them.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
golang.org/x/crypto doesn't enforce invoking key constraints
CVE-2026-39833 / GHSA-jppx-rxg9-jmrx / GO-2026-5005
More information
Details
The in-memory keyring returned by NewKeyring() silently accepted keys with the ConfirmBeforeUse constraint but never enforced it. The key would sign without any confirmation prompt, with no indication to the caller that the constraint was not in effect. NewKeyring() now returns an error when unsupported constraints are requested.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
golang.org/x/crypto: Invoking byte arithmetic causes underflow and panic
CVE-2026-46597 / GHSA-q4h4-gmj2-qvw2 / GO-2026-5013
More information
Details
An incorrectly placed cast from bytes to int allowed for server-side panic in the AES-GCM packet decoder for well-crafted inputs.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
golang.org/x/crypto: Invoking memory leak when rejecting channels can lead to DoS
CVE-2026-39827 / GHSA-qpw4-5x99-6vjp / GO-2026-5016
More information
Details
An authenticated SSH client that repeatedly opened channels which were rejected by the server caused unbounded memory growth, eventually crashing the server process and affecting all connected users. Rejected channels are now properly removed from the connection's internal state and released for garbage collection.
Severity
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
golang.org/x/crypto vulnerable to infinite loop on large channel writes
CVE-2026-39834 / GHSA-rm3j-f69w-wqmq / GO-2026-5020
More information
Details
When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:HReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
golang.org/x/crypto: Invoking client can cause server deadlock on unexpected responses
CVE-2026-39830 / GHSA-vgwf-h737-ff37 / GO-2026-5017
More information
Details
A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop. The blocked goroutine could not be released by calling Close(), resulting in a resource leak per connection. Unsolicited global responses are now discarded.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:HReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
golang.org/x/crypto: Invoking pathological RSA/DSA parameters may cause DoS
CVE-2026-39829 / GHSA-w879-237q-wc7r / GO-2026-5018
More information
Details
The RSA and DSA public key parsers did not enforce size limits on key parameters. A crafted public key with an excessively large modulus or DSA parameter could cause several minutes of CPU consumption during signature verification. This could be triggered by unauthenticated clients during public key authentication. RSA moduli are now limited to 8192 bits, and DSA parameters are validated per FIPS 186-2.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
golang.org/x/crypto: Invoking VerifiedPublicKeyCallback permissions skip enforcement
CVE-2026-46595 / GHSA-x527-x647-q7gg / GO-2026-5023
More information
Details
Previously, CVE-2024-45337 fixed an authorization bypass for misused ssh server configurations; if any other type of callback is passed other than public key, then the source-address validation would be skipped.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:LReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
Invoking key constraints not enforced in golang.org/x/crypto/ssh/agent
CVE-2026-39833 / GHSA-jppx-rxg9-jmrx / GO-2026-5005
More information
Details
The in-memory keyring returned by NewKeyring() silently accepted keys with the ConfirmBeforeUse constraint but never enforced it. The key would sign without any confirmation prompt, with no indication to the caller that the constraint was not in effect. NewKeyring() now returns an error when unsupported constraints are requested.
Severity
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
Invoking agent constraints dropped when forwarding keys in golang.org/x/crypto/ssh/agent
CVE-2026-39832 / GHSA-f5wc-c3c7-36mc / GO-2026-5006
More information
Details
When adding a key to a remote agent constraint extensions such as restrict-destination-v00@openssh.com were not serialized in the request. Destination restrictions were silently stripped when forwarding keys, allowing unrestricted use of the key on the remote host. The client now serializes all constraint extensions. Additionally, the in-memory keyring returned by NewKeyring() now rejects keys with unsuppo