CVE-2026-1539 Libsoup: libsoup: credential leakage via http redirects

What is CVE-2026-1539?

CVE-2026-1539 is a medium-severity vulnerability in Redhat Enterprise Linux, published on 28 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-201

Which versions are affected by CVE-2026-1539?

It affects 2 products.

Products include Gnome Libsoup, Redhat Enterprise Linux.

How do I fix CVE-2026-1539?

Apply the vendor's patch.

Is CVE-2026-1539 being exploited?

There is no known exploitation of CVE-2026-1539 in the wild and no public exploit code.

Other vulnerabilities in Redhat Enterprise Linux

• CVE-2026-102556 Libsoup: libsoup: heap buffer overflow from websocket pong signal type confusion High 8.6
• CVE-2026-102557 Libsoup: libsoup: heap buffer overflow during websocket message reassembly High 8.6
• CVE-2026-102558 Libsoup: libsoup: heap buffer overflow during websocket receive-buffer growth High 8.6
• CVE-2026-102559 Libsoup: libsoup: heap buffer overflow during websocket client-frame masking High 8.6
• CVE-2026-102560 Libsoup: libsoup: heap buffer overflow during outgoing permessage-deflate buffer growth High 8.6

All Redhat Enterprise Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-1539, ECHO-ceab-f4e8-a26d, GHSA-wj9p-f539-2mhr, UBUNTU-CVE-2026-1539.