Inconsistent interpretation of HTTP requests in libsoup - CVE-2026-1801

Vulnerability identifier: #VU122822

CSH Severity: Medium

CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-1801

CWE-ID: CWE-444

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform HTTP request smuggling attacks.

The vulnerability exists due to improper validation of HTTP requests in the soup_filter_input_stream_read_line(). A remote attacker can send a specially crafted HTTP request to the server and smuggle arbitrary HTTP headers.

Successful exploitation of vulnerability may allow an attacker to poison HTTP cache and perform phishing attacks.

libsoup
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
Basesystem Module
openSUSE Leap
Anolis OS
libsoup-lang
typelib-1_0-Soup-2_4
libsoup-2_4-1-32bit
libsoup-debugsource
libsoup-2_4-1
libsoup-2_4-1-debuginfo
libsoup-2_4-1-debuginfo-32bit
libsoup-devel
libsoup2-devel-32bit
libsoup2-devel
libsoup2-debugsource
libsoup-2_4-1-32bit-debuginfo
libsoup2-devel-64bit
libsoup-2_4-1-64bit
libsoup-2_4-1-64bit-debuginfo
libsoup2-lang
libsoup-3_0-0-64bit-debuginfo
libsoup-devel-64bit
libsoup-3_0-0-64bit
libsoup-3_0-0-32bit-debuginfo
libsoup-3_0-0-32bit
libsoup-devel-32bit
libsoup-3_0-0-debuginfo
typelib-1_0-Soup-3_0
libsoup-3_0-0
libsoup3
libsoup3-doc
libsoup3-devel

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

libsoup-lang - addressed in versions 2.62.2-5.43.1, 3.0.4-150400.3.43.1
typelib-1_0-Soup-2_4 - addressed in versions 2.62.2-5.43.1, 2.74.2-150400.3.37.1, 2.74.3-150600.4.36.1
libsoup-2_4-1-32bit - addressed in versions 2.62.2-5.43.1, 2.74.2-150400.3.37.1, 2.74.3-150600.4.36.1
libsoup-debugsource - addressed in versions 2.62.2-5.43.1, 3.0.4-150400.3.43.1
libsoup-2_4-1 - addressed in versions 2.62.2-5.43.1, 2.74.2-150400.3.37.1, 2.74.3-150600.4.36.1
libsoup-2_4-1-debuginfo - addressed in versions 2.62.2-5.43.1, 2.74.2-150400.3.37.1, 2.74.3-150600.4.36.1
libsoup-2_4-1-debuginfo-32bit - update to 2.62.2-5.43.1
libsoup-devel - addressed in versions 2.62.2-5.43.1, 3.0.4-150400.3.43.1
libsoup2-devel-32bit - addressed in versions 2.74.2-150400.3.37.1, 2.74.3-150600.4.36.1
libsoup2-devel - addressed in versions 2.74.2-150400.3.37.1, 2.74.3-150600.4.36.1
libsoup2-debugsource - addressed in versions 2.74.2-150400.3.37.1, 2.74.3-150600.4.36.1
libsoup-2_4-1-32bit-debuginfo - addressed in versions 2.74.2-150400.3.37.1, 2.74.3-150600.4.36.1
libsoup2-devel-64bit - addressed in versions 2.74.2-150400.3.37.1, 2.74.3-150600.4.36.1
libsoup-2_4-1-64bit - addressed in versions 2.74.2-150400.3.37.1, 2.74.3-150600.4.36.1
libsoup-2_4-1-64bit-debuginfo - addressed in versions 2.74.2-150400.3.37.1, 2.74.3-150600.4.36.1
libsoup2-lang - addressed in versions 2.74.2-150400.3.37.1, 2.74.3-150600.4.36.1
libsoup-3_0-0-64bit-debuginfo - update to 3.0.4-150400.3.43.1
libsoup-devel-64bit - update to 3.0.4-150400.3.43.1
libsoup-3_0-0-64bit - update to 3.0.4-150400.3.43.1
libsoup-3_0-0-32bit-debuginfo - update to 3.0.4-150400.3.43.1
libsoup-3_0-0-32bit - update to 3.0.4-150400.3.43.1
libsoup-devel-32bit - update to 3.0.4-150400.3.43.1
libsoup-3_0-0-debuginfo - update to 3.0.4-150400.3.43.1
typelib-1_0-Soup-3_0 - update to 3.0.4-150400.3.43.1
libsoup-3_0-0 - update to 3.0.4-150400.3.43.1
libsoup3 - update to 3.6.5-9
libsoup3-doc - update to 3.6.5-9
libsoup3-devel - update to 3.6.5-9

• https://access.redhat.com/security/cve/CVE-2026-1801
• https://bugzilla.redhat.com/show_bug.cgi?id=2436315

• HTTP request smuggling in libsoup
• Anolis OS update for libsoup3
• SUSE update for libsoup2
• SUSE update for libsoup
• SUSE update for libsoup2
• SUSE update for libsoup