What’s Vulnerable › Vulnerabilities

CVE-2023-29401: Improper handling of filenames in Content-Disposition HTTP header in github.com/gin-gonic/gin

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-06-08 · updated 2026-06-17
• Weakness: CWE-494

Description

The filename parameter of the Context.FileAttachment function is not properly sanitized. A maliciously crafted filename can cause the Content-Disposition header to be sent with an unexpected filename value or otherwise modify the Content-Disposition header. For example, a filename of "setup.bat";x=.txt" will be sent as a file named "setup.bat". If the FileAttachment function is called with names provided by an untrusted source, this may permit an attacker to cause a file to be served with a name different than provided. Maliciously crafted attachment file name can modify the Content-Disposition header.

Affected products

• github.com/gin-gonic/gin: from 1.3.1-0.20190301021747-ccb9e902956d before 1.9.1 — fixed in 1.9.1

How to fix

Upgrade to a fixed version: github.com/gin-gonic/gin 1.9.1. Check the vendor advisory for mitigations.

References

• https://github.com/gin-gonic/gin/issues/3555
• https://github.com/gin-gonic/gin/pull/3556
• https://github.com/gin-gonic/gin/releases/tag/v1.9.1
• https://pkg.go.dev/vuln/GO-2023-1737
• https://github.com/gin-gonic/gin/issues/3555
• https://github.com/gin-gonic/gin/pull/3556
• https://github.com/gin-gonic/gin/releases/tag/v1.9.1
• https://pkg.go.dev/vuln/GO-2023-1737

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