CVE-2026-12547

lowCVSS 3.4covered by 2 sourcesfirst seen 2026-07-14

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.

CSIRTS triage

What: There is an information disclosure vulnerability in libsoup related to proxy credential leaks.
Who is affected: Applications using libsoup for HTTP requests.
Urgency: Remediation is important to protect sensitive information, with a low severity rating.
Action: Upgrade to the latest version of libsoup that resolves this issue.

AI-assisted analysis generated from the source advisory — verify against the original.

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Exploitation outlook

Low exploitation risk0.23% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 14% of all EPSS-scored CVEs.

Advisory coverage (2)

lowCVE-2026-12547: SoupAuthManager caches proxy authentication credentials without scoping them to the proxy auth…nvd · 2026-07-21
lowCVE-2026-12547: Libsoup: information disclosure in libsoup via soupauthmanager proxy credential leak on proxy …msrc · 2026-07-14

External references

NVD record for CVE-2026-12547

CVE.org record

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