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Soft Serve vulnerable to arbitrary file writing through SSH API

High severity GitHub Reviewed Published Sep 2, 2025 in charmbracelet/soft-serve • Updated Sep 4, 2025

Package

gomod github.com/charmbracelet/soft-serve (Go)

Affected versions

< 0.10.0

Patched versions

0.10.0

Description

Attackers can create/override arbitrary files with uncontrolled data.

For a PoC, spin up an instance of soft-serve as explained in the README, and execute the following command:

ssh -p23231 localhost repo commit icecream -- --output=/tmp/pwned

It should have created a file in /tmp/pwned.

References

@caarlos0 caarlos0 published to charmbracelet/soft-serve Sep 2, 2025
Published to the GitHub Advisory Database Sep 2, 2025
Reviewed Sep 2, 2025
Published by the National Vulnerability Database Sep 4, 2025
Last updated Sep 4, 2025

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality
None
Integrity
High
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(10th percentile)

Weaknesses

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Learn more on MITRE.

CVE ID

CVE-2025-58355

GHSA ID

GHSA-33pr-m977-5w97

Source code

Credits

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