CVE-2026-12547 (CVSS 3.4)

Description

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.

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CVSS v3.1 Score

3.4

LOW

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

Weakness Type (CWE)

CWE-201 CWE-201

References

Other References

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

Frequently Asked Questions

What is CVE-2026-12547? +

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. It has a CVSS v3.1 base score of 3.4 (LOW).

How severe is CVE-2026-12547? +

CVE-2026-12547 has a CVSS v3.1 score of 3.4 out of 10, rated LOW. This is a low-severity vulnerability with limited impact.

How do I check if I'm vulnerable to CVE-2026-12547? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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