Vulnerability · Published Jul 21, 2026 · Assigned by redhat
CVE-2026-12547Libsoup: information disclosure in libsoup via soupauthmanager proxy credential leak on proxy switch
Low 3.4
In plain English
A low-severity security flaw in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)3.4Low
Exploit odds (30 days)0.2%top 86.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libsoup2.4 | no fix listed | DEBIAN-CVE-2026-12547 |
| Debian:13 | libsoup2.4 | no fix listed | DEBIAN-CVE-2026-12547 |
| Debian:12 | libsoup3 | no fix listed | DEBIAN-CVE-2026-12547 |
| Debian:13 | libsoup3 | no fix listed | DEBIAN-CVE-2026-12547 |
| Ubuntu:22.04:LTS | libsoup2.4 | 2.74.2-3ubuntu0.10 | USN-8975-1 |
| Ubuntu:22.04:LTS | libsoup2.4 | 2.74.2-3ubuntu0.10 | UBUNTU-CVE-2026-12547 |
| Ubuntu:24.04:LTS | libsoup2.4 | 2.74.3-6ubuntu1.10 | USN-8975-1 |
| Ubuntu:24.04:LTS | libsoup2.4 | 2.74.3-6ubuntu1.10 | UBUNTU-CVE-2026-12547 |
| Ubuntu:26.10 | libsoup2.4 | no fix listed | UBUNTU-CVE-2026-12547 |
| Ubuntu:24.04:LTS | libsoup3 | 3.4.4-5ubuntu0.10 | UBUNTU-CVE-2026-12547 |
| Ubuntu:24.04:LTS | libsoup3 | 3.4.4-5ubuntu0.10 | USN-8975-1 |
| Ubuntu:26.04:LTS | libsoup3 | 3.6.6-1ubuntu0.2 | USN-8975-1 |
| Ubuntu:26.04:LTS | libsoup3 | 3.6.6-1ubuntu0.2 | UBUNTU-CVE-2026-12547 |
| Ubuntu:26.10 | libsoup3 | 3.6.6-1ubuntu3.1 | UBUNTU-CVE-2026-12547 |
| Ubuntu:26.10 | libsoup3 | 3.6.6-1ubuntu3.1 | USN-8975-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | see references |
Weakness: CWE-201 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:N/A:N
References
- https://access.redhat.com/security/cve/CVE-2026-12547 vdb-entry, x_refsource_REDHAT
- RHBZ#2489994 issue-tracking, x_refsource_REDHAT
- https://gitlab.gnome.org/GNOME/libsoup/-/work_items/506