---
id: CVE-2026-1539
title: 'Libsoup: libsoup: credential leakage via http redirects'
summary: >-
  A flaw was found in the libsoup HTTP library that can cause proxy
  authentication credentials to be sent to unintended destinations. When
  handling HTTP redirects, libsoup removes the Authorization header but does not
  remove the Proxy-Auth…
severity: medium
cvss: 5.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-201
vendor: Red Hat
product: libsoup3
affected:
  - libsoup3 (all versions)
  - libsoup (all versions)
  - libsoup (all versions)
  - libsoup (all versions)
  - libsoup (all versions)
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-01-28T16:09:01.060307Z'
published: '2026-01-28'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T16:40:36.102Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-1539'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-1539'
  - url: 'https://gitlab.gnome.org/GNOME/libsoup/-/issues/489'
tags:
  - cve.org
epss: 0.00274
epssPercentile: 0.19898
ingestedAt: '2026-11-05T22:38:31.379Z'
---

## Overview

A flaw was found in the libsoup HTTP library that can cause proxy authentication credentials to be sent to unintended destinations. When handling HTTP redirects, libsoup removes the Authorization header but does not remove the Proxy-Authorization header if the request is redirected to a different host. As a result, sensitive proxy credentials may be leaked to third-party servers. Applications using libsoup for HTTP communication may unintentionally expose proxy authentication data.

## Affected

- `libsoup3 (all versions)`
- `libsoup (all versions)`
- `libsoup (all versions)`
- `libsoup (all versions)`
- `libsoup (all versions)`

## Remediation

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

### Workarounds

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.