Low [CVE-2026-12547] information disclosure in libsoup via soupauthmanager proxy credential leak on proxy switch
This low-severity Red Hat Linux advisory covers CVE-2026-12547 affecting Red Hat Enterprise Linux 10, Red Hat package: libsoup3.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
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.
This vulnerability is deemed LOW because it requires the user changing the desktop proxy settings from an authenticated proxy to the attacker's proxy. Red Hat severity: Low — CVSS 3.4 (CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:N/A:N).
Weakness: CWE-201. Affected Red Hat products: Red Hat Enterprise Linux 10.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: libsoup3.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
Mitigation checklist
- If changing desktop proxy settings, close any applications using libsoup, then restart the application after the setting has been changed.
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
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