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Fencer Vulns
medium 5.8

CVE-2026-1539 json

Libsoup: libsoup: credential leakage via http redirects

published 2026-01-28 9 mo ago modified 2026-11-05 3 d ago also EUVD-2026-4889

cvss
5.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 19%
public exploits
0
none known

Summary

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.

Patch / fix

  • libsoup3 Ubuntu 24.04 LTS 3.4.4-5ubuntu0.7
  • libsoup3 Ubuntu 25.10 3.6.5-4ubuntu0.2
  • libsoup2.4 Ubuntu 22.04 LTS 2.74.2-3ubuntu0.8
  • libsoup2.4 Ubuntu 24.04 LTS 2.74.3-6ubuntu1.8
  • libsoup3 Ubuntu Pro 22.04 LTS 3.0.7-0ubuntu1+esm7
  • libsoup2.4 Ubuntu Pro 16.04 LTS 2.52.2-1ubuntu0.3+esm7
  • libsoup2.4 Ubuntu Pro 18.04 LTS 2.62.1-1ubuntu0.4+esm8
  • libsoup2.4 Ubuntu Pro 20.04 LTS 2.70.0-1ubuntu0.5+esm3

ubuntu advisories UBUNTU-CVE-2026-1539

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libsoup SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 3.6.6-160000.1.1
  • libsoup Linux Micro 6.0 3.4.2-14.1
  • libsoup2 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +8 more 2.74.2-150400.3.31.1
  • libsoup SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 3.0.4-150400.3.37.1
  • libsoup2 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 +1 more 2.74.3-150600.4.30.1
  • libsoup SLE Micro 5.2 2.68.4-150200.4.33.1
  • libsoup SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 +1 more 3.4.4-150600.3.37.1
  • libsoup Linux Micro 6.1 3.4.4-slfo.1.1_7.1

suse advisories SUSE-SU-2026:4690-1SUSE-SU-2026:20752-1SUSE-SU-2026:20902-1SUSE-SU-2026:20727-1SUSE-SU-2026:0834-1SUSE-SU-2026:0833-1

  • libsoup openSUSE Leap 16.0 3.6.6-160000.1.1
  • libsoup2 openSUSE Leap 16.0 2.74.3-160000.4.1
  • libsoup2 openSUSE Tumbleweed 2.74.3-18.1
  • libsoup openSUSE Tumbleweed 3.6.6-2.1

opensuse advisories openSUSE-SU-2026:20384-1openSUSE-SU-2026:20354-1openSUSE-SU-2026:10291-1openSUSE-SU-2026:10276-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-1539 updated cvss 5.8

libsoup: libsoup: Credential leakage via HTTP redirects

  • Red Hat Enterprise Linux 6 libsoup Red Hat Enterprise Linux 7 libsoup Red Hat Enterprise Linux 8 libsoup Red Hat Enterprise Linux 9 libsoup Red Hat Enterprise Linux 10 libsoup3
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
9 mo ago

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
NVD 3.1 5.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness
  • CWE-201 Insertion of Sensitive Information Into Sent Data

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.