CVE-2026-1539

Publication date 28 January 2026

Last updated 9 February 2026

Ubuntu priority

Cvss 3 Severity Score

Description

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libsoup2.4	25.10 questing	Needs evaluation
	24.04 LTS noble	Needs evaluation
	22.04 LTS jammy	Needs evaluation
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
libsoup3	25.10 questing	Fixed 3.6.5-4ubuntu0.2
	24.04 LTS noble	Fixed 3.4.4-5ubuntu0.7
	22.04 LTS jammy	Fixed 3.0.7-0ubuntu1+esm7

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
libsoup2.4	Upstream: 98c1285
libsoup3	Upstream: 98c1285

Severity score breakdown

Parameter	Value
Base score	5.8 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Changed
Confidentiality	Low
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

References

Related Ubuntu Security Notices (USN)

USN-8020-1
libsoup vulnerabilities
8 February 2026