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

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Summary

CVECVE-2026-12547
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-21 19:17:09 UTC
Updated2026-07-21 20:16:58 UTC
DescriptionSoupAuthManager 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.

Risk And Classification

Primary CVSS: v3.1 3.4 LOW from [email protected]

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

Problem Types: CWE-201 | CWE-201 Insertion of Sensitive Information Into Sent Data

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary3.4LOWCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:N/A:N
3.1CNACVSS3.4LOWCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Enterprise Linux 10 Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/security/cve/CVE-2026-12547 [email protected] access.redhat.com
gitlab.gnome.org/GNOME/libsoup/-/work_items/506 [email protected] gitlab.gnome.org
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

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

Additional Advisory Data

SourceTimeEvent
CNA2026-06-17T18:01:37.602ZReported to Red Hat.
CNA2026-04-25T00:00:00.000ZMade public.

Workarounds

CNA: If changing desktop proxy settings, close any applications using libsoup, then restart the application after the setting has been changed.

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