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CVE-2026-3634

Libsoup: libsoup: http header injection and response splitting via crlf injection in content-type header

3.9 Low

A flaw was found in libsoup. An attacker controlling the value used to set the Content-Type header can inject a Carriage Return Line Feed (CRLF) sequence due to improper input sanitization in the soup_message_headers_set_content_type() function. This vulnerability allows for the injection of arbitrary header-value pairs, potentially leading to HTTP header injection and response splitting attacks.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
High
User interaction
Required

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
Low

Exploit likelihood

0.19%Up 0.2 points since Mar 17, 2026
90%50%10%1%

What each source reports

CVE List Score used 3.9

Libsoup: libsoup: http header injection and response splitting via crlf injection in content-type header

A flaw was found in libsoup. An attacker controlling the value used to set the Content-Type header can inject a Carriage Return Line Feed (CRLF) sequence due to improper input sanitization in the soup_message_headers_set_content_type() function. This vulnerability allows for the injection of arbitrary header-value pairs, potentially leading to HTTP header injection and response splitting attacks.

Record
CVE-2026-3634
CVSS 3.1
3.9 LowCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L
Weakness
CWE-93
Updated
2026-11-05
EUVDEUVD-2026-12561 3.9

A flaw was found in libsoup. An attacker controlling the value used to set the Content-Type header can inject a Carriage Return Line Feed (CRLF) sequence due to improper input sanitization in the soup_message_headers_set_content_type() function. This vulnerability allows for the injection of arbitrary header-value pairs, potentially leading to HTTP header injection and response splitting attacks.

Record
EUVD-2026-12561
CVSS 3.1
3.9 LowCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L
Updated
2026-11-05
GitHub AdvisoriesGHSA-jx6g-363c-pprr 3.9

A flaw was found in libsoup. An attacker controlling the value used to set the Content-Type...

A flaw was found in libsoup. An attacker controlling the value used to set the Content-Type header can inject a Carriage Return Line Feed (CRLF) sequence due to improper input sanitization in the soup_message_headers_set_content_type() function. This vulnerability allows for the injection of arbitrary header-value pairs, potentially leading to HTTP header injection and response splitting attacks.

Record
GHSA-jx6g-363c-pprr
CVSS 3.1
3.9 LowCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L
Weakness
CWE-93
Updated
2026-11-02
NVD 3.9

A flaw was found in libsoup. An attacker controlling the value used to set the Content-Type header can inject a Carriage Return Line Feed (CRLF) sequence due to improper input sanitization in the soup_message_headers_set_content_type() function. This vulnerability allows for the injection of arbitrary header-value pairs, potentially leading to HTTP header injection and response splitting attacks.

Record
CVE-2026-3634
CVSS 3.1
3.9 LowCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-93
Updated
2026-11-05
OSVDEBIAN-CVE-2026-3634 6.5

A flaw was found in libsoup. An attacker controlling the value used to set the Content-Type header can inject a Carriage Return Line Feed (CRLF) sequence due to improper input sanitization in the soup_message_headers_set_content_type() function. This vulnerability allows for the injection of arbitrary header-value pairs, potentially leading to HTTP header injection and response splitting attacks.

Record
DEBIAN-CVE-2026-3634
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2026-3634 3.9

A flaw was found in libsoup. An attacker controlling the value used to set the Content-Type header can inject a Carriage Return Line Feed (CRLF) sequence due to improper input sanitization in the soup_message_headers_set_content_type() function. This vulnerability allows for the injection of arbitrary header-value pairs, potentially leading to HTTP header injection and response splitting attacks.

Record
UBUNTU-CVE-2026-3634
CVSS 3.1
3.9 LowCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-03
OSVAZL-80226 No score

CVE-2026-3634 affecting package libsoup 3.4.4-18

A flaw was found in libsoup. An attacker controlling the value used to set the Content-Type header can inject a Carriage Return Line Feed (CRLF) sequence due to improper input sanitization in the soup_message_headers_set_content_type() function. This vulnerability allows for the injection of arbitrary header-value pairs, potentially leading to HTTP header injection and response splitting attacks.

Record
AZL-80226
Updated
2026-11-05

Affected products

Affected packages

Affected packages
PackageAffectedFixed
libsoup
Azure Linux:3
 through 3.4.4-18 None known
libsoup2.4
Debian:12
 All versions, plus listed versions
2.74.3-12.74.3-1+deb12u12.74.3-102.74.3-10.12.74.3-11
Show 11 moreShow less
2.74.3-22.74.3-32.74.3-3.1~exp12.74.3-3.1~exp22.74.3-3.1~exp32.74.3-52.74.3-62.74.3-72.74.3-82.74.3-8.12.74.3-9
 None known
libsoup2.4
Debian:13
 All versions, plus listed versions
2.74.3-10.12.74.3-11
 None known
libsoup3
Debian:12
 All versions, plus listed versions
3.2.2-23.2.3-0+deb12u13.2.3-0+deb12u23.3.1-13.4.0-1
Show 33 moreShow less
3.4.1-13.4.2-13.4.2-23.4.2-33.4.2-43.4.3-13.4.4-13.4.4-23.4.4-33.4.4-43.4.4-53.5.2-13.6.0-13.6.0-23.6.0-33.6.0-43.6.1-13.6.4-13.6.4-23.6.4-33.6.5-13.6.5-23.6.5-33.6.5-43.6.5-53.6.5-63.6.5-73.6.5-83.6.5-93.6.6-13.8.0-13.8.0-23.8.0-3
 None known
libsoup3
Debian:13
 All versions, plus listed versions
3.6.5-33.6.5-43.6.5-53.6.5-63.6.5-7
Show 6 moreShow less
3.6.5-83.6.5-93.6.6-13.8.0-13.8.0-23.8.0-3
 None known
libsoup2.4
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
2.50.0-2debian12.52.1-12.52.2-12.52.2-1ubuntu0.12.52.2-1ubuntu0.2
Show 10 moreShow less
2.52.2-1ubuntu0.32.52.2-1ubuntu0.3+esm12.52.2-1ubuntu0.3+esm22.52.2-1ubuntu0.3+esm32.52.2-1ubuntu0.3+esm42.52.2-1ubuntu0.3+esm52.52.2-1ubuntu0.3+esm62.52.2-1ubuntu0.3+esm72.52.2-1ubuntu0.3+esm82.52.2-1ubuntu0.3+esm9
 None known
libsoup2.4
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
2.60.1-12.60.2-12.60.2-22.60.3-12.61.90-1
Show 15 moreShow less
2.62.0-12.62.1-12.62.1-1ubuntu0.12.62.1-1ubuntu0.32.62.1-1ubuntu0.42.62.1-1ubuntu0.4+esm12.62.1-1ubuntu0.4+esm22.62.1-1ubuntu0.4+esm32.62.1-1ubuntu0.4+esm42.62.1-1ubuntu0.4+esm52.62.1-1ubuntu0.4+esm62.62.1-1ubuntu0.4+esm72.62.1-1ubuntu0.4+esm82.62.1-1ubuntu0.4+esm92.62.1-1ubuntu0.4+esm10
 None known
libsoup2.4
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
2.68.2-0ubuntu12.68.2-12.68.2-22.68.2-2build22.69.90-1
Show 11 moreShow less
2.70.0-12.70.0-1ubuntu0.12.70.0-1ubuntu0.22.70.0-1ubuntu0.32.70.0-1ubuntu0.42.70.0-1ubuntu0.52.70.0-1ubuntu0.5+esm12.70.0-1ubuntu0.5+esm22.70.0-1ubuntu0.5+esm32.70.0-1ubuntu0.5+esm42.70.0-1ubuntu0.5+esm5
 None known
libsoup2.4
Ubuntu:22.04:LTS
 All versions, plus listed versions
2.72.0-3ubuntu32.74.1-12.74.2-22.74.2-32.74.2-3ubuntu0.1
Show 9 moreShow less
2.74.2-3ubuntu0.22.74.2-3ubuntu0.32.74.2-3ubuntu0.42.74.2-3ubuntu0.52.74.2-3ubuntu0.62.74.2-3ubuntu0.72.74.2-3ubuntu0.82.74.2-3ubuntu0.92.74.2-3ubuntu0.10
 None known
libsoup3
Ubuntu:Pro:22.04:LTS
 All versions, plus listed versions
3.0.4-23.0.4-33.0.5-13.0.7-0ubuntu13.0.7-0ubuntu1+esm1
Show 9 moreShow less
3.0.7-0ubuntu1+esm23.0.7-0ubuntu1+esm33.0.7-0ubuntu1+esm43.0.7-0ubuntu1+esm53.0.7-0ubuntu1+esm63.0.7-0ubuntu1+esm73.0.7-0ubuntu1+esm83.0.7-0ubuntu1+esm93.0.7-0ubuntu1+esm10
 None known
Show 8 moreShow less
Affected packages
PackageAffectedFixed
libsoup2.4
Ubuntu:24.04:LTS
 All versions, plus listed versions
2.74.3-12.74.3-22.74.3-32.74.3-62.74.3-6build1
Show 11 moreShow less
2.74.3-6ubuntu12.74.3-6ubuntu1.12.74.3-6ubuntu1.22.74.3-6ubuntu1.32.74.3-6ubuntu1.42.74.3-6ubuntu1.52.74.3-6ubuntu1.62.74.3-6ubuntu1.72.74.3-6ubuntu1.82.74.3-6ubuntu1.92.74.3-6ubuntu1.10
 None known
libsoup3
Ubuntu:24.04:LTS
 All versions, plus listed versions
3.4.2-43.4.4-13.4.4-23.4.4-43.4.4-5
Show 12 moreShow less
3.4.4-5build13.4.4-5build23.4.4-5ubuntu0.13.4.4-5ubuntu0.23.4.4-5ubuntu0.33.4.4-5ubuntu0.43.4.4-5ubuntu0.53.4.4-5ubuntu0.63.4.4-5ubuntu0.73.4.4-5ubuntu0.83.4.4-5ubuntu0.93.4.4-5ubuntu0.10
 None known
libsoup2.4
Ubuntu:25.10
 All versions, plus listed versions
2.74.3-102.74.3-10.12.74.3-10.1ubuntu12.74.3-10.1ubuntu22.74.3-10.1ubuntu32.74.3-10.1ubuntu42.74.3-10.1ubuntu4.1
 None known
libsoup3
Ubuntu:25.10
 All versions, plus listed versions
3.6.5-13.6.5-1ubuntu13.6.5-33.6.5-43.6.5-4ubuntu0.13.6.5-4ubuntu0.2
 None known
libsoup2.4
Ubuntu:26.10
 All versions, plus listed versions
2.74.3-10.1ubuntu5
 None known
libsoup3
Ubuntu:26.10
 All versions, plus listed versions
3.6.6-13.6.6-1ubuntu33.6.6-1ubuntu3.1
 None known
libsoup3
Ubuntu:26.04:LTS
 All versions, plus listed versions
3.6.5-43.6.5-53.6.5-63.6.5-73.6.5-93.6.6-13.6.6-1ubuntu0.13.6.6-1ubuntu0.2
 None known
libsoup2.4
Ubuntu:Pro:26.04:LTS
 All versions, plus listed versions
2.74.3-10.1ubuntu42.74.3-10.1ubuntu52.74.3-10.1ubuntu5+esm12.74.3-10.1ubuntu5+esm22.74.3-10.1ubuntu5+esm32.74.3-10.1ubuntu5+esm4
 None known

History

History
RecordedChangedSources
affected, factsCVE List, EUVD, OSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-3634 is a low vulnerability (CVSS 3.9) in Gnome Libsoup, published March 17, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.19%, the 9th percentile. No source names a fixed version.

References

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