Proxy Authentication Credential Leakage in SoupAuthManager of GNOME Libsoup
CVE-2026-12547

3.4LOW

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Vendor
CVE Published:
21 July 2026

What is CVE-2026-12547?

The SoupAuthManager component in GNOME's Libsoup holds onto cached proxy authentication credentials without properly scoping them to the specific proxy authority (host:port). This design flaw can lead to situations where, upon changing proxy configuration—whether through system settings or WPAD—the cached Proxy-Authorization headers intended for the previous proxy may inadvertently be sent to the new one, thereby exposing sensitive authentication credentials.

References

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

CVSS V3.1

Score:
3.4
Severity:
LOW
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

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