Moderate severityNVD Advisory· Published Jul 20, 2020· Updated Aug 4, 2024
CRLF vulnerability in Fiber
CVE-2020-15111
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().
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/gofiber/fiberGo | < 1.12.6 | 1.12.6 |
Affected products
1Patches
11 file changed · +1 −1
ctx.go+1 −1 modified@@ -196,7 +196,7 @@ func (ctx *Ctx) Attachment(filename ...string) { if len(filename) > 0 { fname := filepath.Base(filename[0]) ctx.Type(filepath.Ext(fname)) - ctx.Set(HeaderContentDisposition, `attachment; filename="`+fname+`"`) + ctx.Set(HeaderContentDisposition, `attachment; filename="`+url.QueryEscape(fname)+`"`) return } ctx.Set(HeaderContentDisposition, "attachment")
Vulnerability mechanics
Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.
References
7- github.com/advisories/GHSA-9cx9-x2gp-9qvhghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2020-15111ghsaADVISORY
- github.com/gofiber/fiber/commit/f698b5d5066cfe594102ae252cd58a1fe57cf56fghsaWEB
- github.com/gofiber/fiber/pull/579ghsaWEB
- github.com/gofiber/fiber/pull/579/commits/f698b5d5066cfe594102ae252cd58a1fe57cf56fmitrex_refsource_MISC
- github.com/gofiber/fiber/security/advisories/GHSA-9cx9-x2gp-9qvhghsax_refsource_CONFIRMWEB
- pkg.go.dev/vuln/GO-2021-0108ghsaWEB
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