charmbracelet soft-serve up to 0.11.2 authentication by alternate name

Summaryinfo

A vulnerability, which was classified as critical, was found in charmbracelet soft-serve up to 0.11.2. Impacted is an unknown function. Such manipulation leads to authentication by alternate name. This vulnerability is uniquely identified as CVE-2026-24058. The attack can be launched remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in charmbracelet soft-serve up to 0.11.2. It has been rated as critical. Affected by this issue is some unknown functionality. The manipulation with an unknown input leads to a authentication by alternate name vulnerability. Using CWE to declare the problem leads to CWE-289. The product performs authentication based on the name of a resource being accessed, or the name of the actor performing the access, but it does not properly check all possible names for that resource or actor. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Soft Serve is a self-hostable Git server for the command line. Versions 0.11.2 and below have a critical authentication bypass vulnerability that allows an attacker to impersonate any user (including admin) by "offering" the victim's public key during the SSH handshake before authenticating with their own valid key. This occurs because the user identity is stored in the session context during the "offer" phase and is not cleared if that specific authentication attempt fails. This issue has been fixed in version 0.11.3.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-24058 since 01/20/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available.

Upgrading to version 0.11.3 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 8539f9ad39918b67d612a35785a2b4326efc8741 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• charmbracelet

Name

• soft-serve

Version

• 0.11.0
• 0.11.1
• 0.11.2

License

• open-source

Website

• Product: https://github.com/charmbracelet/soft-serve/

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