packages:
  - module: std
    package: net/textproto
    symbols:
      - CanonicalMIMEHeaderKey
      - canonicalMIMEHeaderKey
    versions:
      - fixed: 1.4.3
description: |
    The MIME header parser treated spaces and hyphens
    as equivalent, which can permit HTTP request smuggling.
published: 2022-01-05T20:00:00Z
cves:
  - CVE-2015-5739
credit: Régis Leroy
links:
    pr: https://go.dev/cl/11772
    commit: https://go.googlesource.com/go/+/117ddcb83d7f42d6aa72241240af99ded81118e9
    context:
      - https://groups.google.com/g/golang-announce/c/iSIyW4lM4hY/m/ADuQR4DiDwAJ