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Back to active CVEs
Low · CVSS 3.4CVE-2026-12547

Libsoup: information disclosure in libsoup via soupauthmanager proxy credential leak on proxy switchCVE-2026-12547

Answer in brief

CVE-2026-12547 records a Low severity (CVSS 3.4) vulnerability in Libsoup: information disclosure in libsoup via soupauthmanager proxy credential leak on proxy switch. The current sources do not mark it as known exploited. The current feed maps Red Hat/libsoup3 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 21, 2026Updated Nov 6, 2026Source checked Nov 6, 2026First seen by HOL Oct 28, 2026Material review Nov 6, 2026
Upstream Advisory

Key facts

Risk
Low · CVSS 3.4
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 3.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/libsoup3 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/libsoup3generic*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/libsoup3.
  2. 2Review the reported fix. Source-reported workaround: If changing desktop proxy settings, close any applications using libsoup, then restart the application after the setting has been changed.

Evidence timeline and material changes

  1. Published upstream

    Jul 21, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 28, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
  • Source referencegitlab.gnome.org
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-201
Source
CVE List V5
Source checked
Nov 6, 2026
References
3 linked sources
Open source record