What’s Vulnerable › Vulnerabilities

CVE-2020-36564: Improper input validation in github.com/justinas/nosurf

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-12-27 · updated 2026-06-17
• Weakness: CWE-20

Description

Due to improper validation of caller input, validation is silently disabled if the provided expected token is malformed, causing any user supplied token to be considered valid.

Affected products

• justinas nosurf: before 1.1.1 — fixed in 1.1.1

How to fix

Upgrade to a fixed version: justinas nosurf 1.1.1. Check the vendor advisory for mitigations.

References

• https://github.com/justinas/nosurf/commit/4d86df7a4affa1fa50ab39fb09aac56c3ce9c314
• https://github.com/justinas/nosurf/pull/60
• https://pkg.go.dev/vuln/GO-2020-0049
• https://github.com/justinas/nosurf/commit/4d86df7a4affa1fa50ab39fb09aac56c3ce9c314
• https://github.com/justinas/nosurf/pull/60
• https://pkg.go.dev/vuln/GO-2020-0049

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