CVE-2026-12547

LOW 3.4

Libsoup: information disclosure in libsoup via soupauthmanager proxy credential leak on proxy switch

CVSS Score

3.4

EPSS Score

0.0%

EPSS Percentile

0th

SoupAuthManager caches proxy authentication credentials without scoping them to the proxy authority (host:port). When the proxy configuration changes (e.g., via system settings or WPAD), cached Proxy-Authorization headers from the previous proxy are sent to the new proxy, leaking credentials.

CWE	CWE-201
Vendor	red hat
Product	red hat enterprise linux 10
Published	Jul 21, 2026
Last Updated	Jul 21, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

Red Hat / Red Hat Enterprise Linux 10

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-12547 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2489994 gitlab.gnome.org: https://gitlab.gnome.org/GNOME/libsoup/-/work_items/506

Credits

Red Hat would like to thank Cavid (Yes We Hack) for reporting this issue.