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go-git clients vulnerable to DoS via maliciously crafted Git server replies

High severity GitHub Reviewed Published Jan 5, 2025 in go-git/go-git • Updated Jan 6, 2025

Package

gomod github.com/go-git/go-git (Go)

Affected versions

>= 4.0.0, <= 4.13.1

Patched versions

None
gomod github.com/go-git/go-git/v5 (Go)
< 5.13.0
5.13.0
gomod gopkg.in/src-d/go-git.v4 (Go)
>= 4.0.0, <= 4.13.1
None

Description

Impact

A denial of service (DoS) vulnerability was discovered in go-git versions prior to v5.13. This vulnerability allows an attacker to perform denial of service attacks by providing specially crafted responses from a Git server which triggers resource exhaustion in go-git clients.

This is a go-git implementation issue and does not affect the upstream git cli.

Patches

Users running versions of go-git from v4 and above are recommended to upgrade to v5.13 in order to mitigate this vulnerability.

Workarounds

In cases where a bump to the latest version of go-git is not possible, we recommend limiting its use to only trust-worthy Git servers.

Credit

Thanks to Ionut Lalu for responsibly disclosing this vulnerability to us.

References

@pjbgf pjbgf published to go-git/go-git Jan 5, 2025
Published to the GitHub Advisory Database Jan 6, 2025
Reviewed Jan 6, 2025
Published by the National Vulnerability Database Jan 6, 2025
Last updated Jan 6, 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
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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:N/UI:N/S:U/C:N/I:N/A:H

EPSS score

0.043%
(11th percentile)

Weaknesses

CVE ID

CVE-2025-21614

GHSA ID

GHSA-r9px-m959-cxf4

Source code

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