CVE-2026-1539
Unknown Unknown - Not Provided
Proxy-Authorization Header Exposure in libsoup Causes Credential Leak

Publication date: 2026-01-28

Last updated on: 2026-03-25

Assigner: Red Hat, Inc.

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.
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Meta Information
Published
2026-01-28
Last Modified
2026-03-25
Generated
2026-06-16
AI Q&A
2026-01-29
EPSS Evaluated
2026-06-15
NVD
CVE-2026-1539
EUVD
EUVD-2026-4889
Affected Vendors & Products
Showing 6 associated CPEs
Vendor Product Version / Range
redhat enterprise_linux 7.0
redhat enterprise_linux 6.0
redhat enterprise_linux 8.0
redhat enterprise_linux 9.0
redhat enterprise_linux 10.0
gnome libsoup *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-201 The code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor.
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Executive Summary

This vulnerability is a flaw in the libsoup HTTP library where proxy authentication credentials can be sent to unintended destinations. Specifically, when handling HTTP redirects, libsoup removes the Authorization header but fails to remove the Proxy-Authorization header if the request is redirected to a different host. This can cause sensitive proxy credentials to be leaked to third-party servers.

Impact Analysis

This vulnerability can lead to the unintended exposure of sensitive proxy authentication credentials to third-party servers. If you use applications that rely on libsoup for HTTP communication, your proxy credentials might be leaked during HTTP redirects, potentially allowing unauthorized parties to access your proxy or network resources.

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