CVE-2020-15111 CRLF vulnerability in Fiber

What is CVE-2020-15111?

CVE-2020-15111 is a medium-severity vulnerability in gofiber fiber, published on 20 Jul 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

In Fiber before version 1.12.6, the filename that is given in c.Attachment() (https://docs.gofiber.io/ctx#attachment) is not escaped, and therefore vulnerable for a CRLF injection attack. I.e. an attacker could upload a custom filename and then give the link to the victim. With this filename, the attacker can change the name of the downloaded file, redirect to another site, change the authorization header, etc. A possible workaround is to serialize the input before passing it to ctx.Attachment().

Weakness: CWE-93, CWE-74

Which versions are affected by CVE-2020-15111?

3 open source packages ship an affected version, including github.com/gofiber/fiber. It affects 1 product.

Products include Gofiber Fiber.

How do I fix CVE-2020-15111?

Upgrade github.com/gofiber/fiber to 1.12.6 or later.

Is CVE-2020-15111 being exploited?

There is no known exploitation of CVE-2020-15111 in the wild and no public exploit code.

Other vulnerabilities in gofiber fiber

• CVE-2024-38513 Fiber Session Middleware Token Injection Vulnerability Critical 10.0
• CVE-2023-45128 CSRF Token Reuse Vulnerability in fiber Critical 10.0
• CVE-2024-25124 Fiber has Insecure CORS Configuration, Allowing Wildcard Origin with Credentials Critical 9.4
• CVE-2025-66630 Fiber insecurely fallsback in utils.UUIDv4() / utils.UUID() — predictable / zero‑UUID on crypto/rand failure Critical 9.2
• CVE-2025-54801 Fiber Susceptible to Crash via `BodyParser` Due to Unvalidated Large Slice Index in Decoder High 8.7

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-9cx9-x2gp-9qvh, GO-2021-0108.