Skip to content
Fencer Vulns
medium 5.8

CVE-2026-1536 json

Libsoup: libsoup: http header injection or response splitting via crlf injection in content-disposition header

published 2026-01-28 9 mo ago modified 2026-11-05 3 d ago also EUVD-2026-4887

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 28%
public exploits
0
none known

Summary

A flaw was found in libsoup. An attacker who can control the input for the Content-Disposition header can inject CRLF (Carriage Return Line Feed) sequences into the header value. These sequences are then interpreted verbatim when the HTTP request or response is constructed, allowing arbitrary HTTP headers to be injected. This vulnerability can lead to HTTP header injection or HTTP response splitting without requiring authentication or user interaction.

Patch / fix

  • libsoup3 Ubuntu 24.04 LTS 3.4.4-5ubuntu0.7
  • libsoup3 Ubuntu 25.10 3.6.5-4ubuntu0.2
  • libsoup3 Ubuntu Pro 22.04 LTS 3.0.7-0ubuntu1+esm7

ubuntu advisories UBUNTU-CVE-2026-1536

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 Linux Micro 6.1 3.4.4-slfo.1.1_7.1
  • libsoup SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 3.0.4-150400.3.31.1
  • libsoup Linux Micro 6.0 3.4.2-12.1
  • libsoup SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 +1 more 3.4.4-150600.3.31.1
  • libsoup SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 3.6.5-160000.4.1

suse advisories SUSE-SU-2026:20649-1SUSE-SU-2026:0579-1SUSE-SU-2026:20445-1SUSE-SU-2026:0431-1SUSE-SU-2026:20238-1SUSE-SU-2026:20339-1

  • libsoup openSUSE Leap 16.0 3.6.5-160000.4.1
  • libsoup openSUSE Tumbleweed 3.6.5-12.1

opensuse advisories openSUSE-SU-2026:20186-1openSUSE-SU-2026:10139-1

  • libsoup Azure Linux 3.0 3.4.4-12
  • libsoup CBL-Mariner 2.0 3.0.4-12

azure linux advisories AZL-76370AZL-76395

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2026-1536 updated cvss 5.8

libsoup: libsoup: HTTP header injection or response splitting via CRLF injection in Content-Disposition header

  • 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

0.34% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • gitlab.gnome.org https://gitlab.gnome.org/GNOME/libsoup/-/issues/486 referenced PoC, tagged "exploit" by a source, unverified

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:N/I:L/A:N
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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-93 Improper Neutralization of CRLF Sequences

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.