Vulnerability · Published Jan 28, 2026 · Assigned by redhat
CVE-2026-1539Libsoup: libsoup: credential leakage via http redirects
Medium 5.8
In plain English
A medium-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 0.3% (higher than 20% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
A flaw was found in the libsoup HTTP library that can cause proxy authentication credentials to be sent to unintended destinations. When handling HTTP redirects, libsoup removes the Authorization header but does not remove the Proxy-Authorization header if the request is redirected to a different host. As a result, sensitive proxy credentials may be leaked to third-party servers. Applications using libsoup for HTTP communication may unintentionally expose proxy authentication data.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libsoup2.4 | no fix listed | DEBIAN-CVE-2026-1539 |
| Debian:13 | libsoup2.4 | no fix listed | DEBIAN-CVE-2026-1539 |
| Debian:12 | libsoup3 | no fix listed | DEBIAN-CVE-2026-1539 |
| Debian:13 | libsoup3 | no fix listed | DEBIAN-CVE-2026-1539 |
| Ubuntu:22.04:LTS | libsoup2.4 | 2.74.2-3ubuntu0.8 | UBUNTU-CVE-2026-1539 |
| Ubuntu:22.04:LTS | libsoup2.4 | 2.74.2-3ubuntu0.8 | USN-8780-1 |
| Ubuntu:24.04:LTS | libsoup2.4 | 2.74.3-6ubuntu1.8 | UBUNTU-CVE-2026-1539 |
| Ubuntu:24.04:LTS | libsoup2.4 | 2.74.3-6ubuntu1.8 | USN-8780-1 |
| Ubuntu:25.10 | libsoup2.4 | no fix listed | UBUNTU-CVE-2026-1539 |
| Ubuntu:26.10 | libsoup2.4 | no fix listed | UBUNTU-CVE-2026-1539 |
| Ubuntu:24.04:LTS | libsoup3 | 3.4.4-5ubuntu0.8 | USN-8780-1 |
| Ubuntu:24.04:LTS | libsoup3 | 3.4.4-5ubuntu0.7 | UBUNTU-CVE-2026-1539 |
| Ubuntu:24.04:LTS | libsoup3 | 3.4.4-5ubuntu0.7 | USN-8020-1 |
| Ubuntu:25.10 | libsoup3 | 3.6.5-4ubuntu0.2 | USN-8020-1 |
| Ubuntu:25.10 | libsoup3 | 3.6.5-4ubuntu0.2 | UBUNTU-CVE-2026-1539 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 6 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
Weakness: CWE-201 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
References
- https://access.redhat.com/security/cve/CVE-2026-1539 vdb-entry, x_refsource_REDHAT
- https://gitlab.gnome.org/GNOME/libsoup/-/issues/489