CVE-2025-58181

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
lxd	25.10 questing	Not in release
	25.04 plucky	Not in release
	24.04 LTS noble	Not in release
	22.04 LTS jammy	Not in release
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
golang-go.crypto	25.10 questing	Needs evaluation
	25.04 plucky	Needs evaluation
	24.04 LTS noble	Needs evaluation
	22.04 LTS jammy	Needs evaluation
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
snapd	25.10 questing	Needs evaluation
	25.04 plucky	Needs evaluation
	24.04 LTS noble	Needs evaluation
	22.04 LTS jammy	Needs evaluation
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
google-guest-agent	25.10 questing	Fixed 20250506.01-0ubuntu1.1
	25.04 plucky	Fixed 20250116.00-0ubuntu2.2
	24.04 LTS noble	Fixed 20250116.00-0ubuntu1~24.04.3
	22.04 LTS jammy	Fixed 20250116.00-0ubuntu1~22.04.2
	20.04 LTS focal	Fixed 20250116.00-0ubuntu1~20.04.0+esm2
	18.04 LTS bionic	Fixed 20241011.01-0ubuntu1~18.04.0+esm2
	16.04 LTS xenial	Fixed 20240716.00-0ubuntu1~16.04.0+esm2

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Notes

jdstrand

snapd contains an embedded copy of golang-go.crypto lxd in 18.04 LTS and earlier contains an embedded copy of golang-go.crypto

hlibk

google-guest-agent contains an embedded copy of golang-go.crypto

Severity score breakdown

Parameter	Value
Base score	5.3 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	Low
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

Related Ubuntu Security Notices (USN)

USN-7956-1
Google Guest Agent vulnerability
13 January 2026