---
id: CVE-2025-46421
title: A flaw was found in libsoup
summary: >-
  A flaw was found in libsoup. When libsoup clients encounter an HTTP redirect,
  they mistakenly send the HTTP Authorization header to the new host that the
  redirection points to. This allows the new host to impersonate the user to the
  orig…
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N'
cwe:
  - CWE-497
published: '2025-04-24'
updated: '2026-06-25'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-46421'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2025:4439'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:4440'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:4508'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:4538'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:4560'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:4568'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:4609'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:4624'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:7436'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:7505'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2025-46421'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2361962'
    label: secalert@redhat.com
  - url: 'https://gitlab.gnome.org/GNOME/libsoup/-/issues/439'
    label: secalert@redhat.com
tags:
  - nvd
epss: 0.00573
epssPercentile: 0.45042
ingestedAt: '2026-06-29T13:24:34.200Z'
---

## Overview

A flaw was found in libsoup. When libsoup clients encounter an HTTP redirect, they mistakenly send the HTTP Authorization header to the new host that the redirection points to. This allows the new host to impersonate the user to the original host that issued the redirect.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.