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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.

Severity (CVSS 3.1)5.8Medium
Exploit odds (30 days)0.3%top 80.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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

EcosystemPackageFixed inAdvisory
Debian:12libsoup2.4no fix listedDEBIAN-CVE-2026-1539
Debian:13libsoup2.4no fix listedDEBIAN-CVE-2026-1539
Debian:12libsoup3no fix listedDEBIAN-CVE-2026-1539
Debian:13libsoup3no fix listedDEBIAN-CVE-2026-1539
Ubuntu:22.04:LTSlibsoup2.42.74.2-3ubuntu0.8UBUNTU-CVE-2026-1539
Ubuntu:22.04:LTSlibsoup2.42.74.2-3ubuntu0.8USN-8780-1
Ubuntu:24.04:LTSlibsoup2.42.74.3-6ubuntu1.8UBUNTU-CVE-2026-1539
Ubuntu:24.04:LTSlibsoup2.42.74.3-6ubuntu1.8USN-8780-1
Ubuntu:25.10libsoup2.4no fix listedUBUNTU-CVE-2026-1539
Ubuntu:26.10libsoup2.4no fix listedUBUNTU-CVE-2026-1539
Ubuntu:24.04:LTSlibsoup33.4.4-5ubuntu0.8USN-8780-1
Ubuntu:24.04:LTSlibsoup33.4.4-5ubuntu0.7UBUNTU-CVE-2026-1539
Ubuntu:24.04:LTSlibsoup33.4.4-5ubuntu0.7USN-8020-1
Ubuntu:25.10libsoup33.6.5-4ubuntu0.2USN-8020-1
Ubuntu:25.10libsoup33.6.5-4ubuntu0.2UBUNTU-CVE-2026-1539

Affected products (as reported)

VendorProductVersions
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