What is CVE-2026-1539?

CVE-2026-1539 is a medium-severity vulnerability in Gnome Libsoup, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 5.8/10. Published 2026-01-28.

How severe is CVE-2026-1539?

Medium severity. CVSS v3 base score is 5.8 out of 10.

Vulnerability in Gnome Libsoup

CVE-2026-1539

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-Author…

EPSS: 0.002 (14.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N.

Affected products

Gnome Libsoup
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Redhat Enterprise_linux — versions 6.0, 7.0, 8.0

Weakness classification (CWE)

CWE-201 — Insertion of Sensitive Information into Sent Data

References

secalert@redhat.com (x_refsource_REDHAT, Third Party Advisory, vdb-entry)
secalert@redhat.com (Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2026-1539?: CVE-2026-1539 is a medium-severity vulnerability in Gnome Libsoup, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 5.8/10. Published 2026-01-28.
How severe is CVE-2026-1539?: Medium severity. CVSS v3 base score is 5.8 out of 10.