Vulnerability · Published Mar 17, 2026 · Assigned by redhat
CVE-2026-3634Libsoup: libsoup: http header injection and response splitting via crlf injection in content-type header
Low 3.9
In plain English
A low-severity security flaw in Red Hat Enterprise Linux 10 from Red Hat. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities).
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libsoup2.4 | no fix listed | DEBIAN-CVE-2026-3634 |
| Debian:13 | libsoup2.4 | no fix listed | DEBIAN-CVE-2026-3634 |
| Debian:12 | libsoup3 | no fix listed | DEBIAN-CVE-2026-3634 |
| Debian:13 | libsoup3 | no fix listed | DEBIAN-CVE-2026-3634 |
| Ubuntu:22.04:LTS | libsoup2.4 | no fix listed | UBUNTU-CVE-2026-3634 |
| Ubuntu:24.04:LTS | libsoup2.4 | no fix listed | UBUNTU-CVE-2026-3634 |
| Ubuntu:25.10 | libsoup2.4 | no fix listed | UBUNTU-CVE-2026-3634 |
| Ubuntu:26.10 | libsoup2.4 | no fix listed | UBUNTU-CVE-2026-3634 |
| Ubuntu:24.04:LTS | libsoup3 | no fix listed | UBUNTU-CVE-2026-3634 |
| Ubuntu:25.10 | libsoup3 | no fix listed | UBUNTU-CVE-2026-3634 |
| Ubuntu:26.04:LTS | libsoup3 | no fix listed | UBUNTU-CVE-2026-3634 |
| Ubuntu:26.10 | libsoup3 | no fix listed | UBUNTU-CVE-2026-3634 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| 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-93 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L
References
- https://access.redhat.com/security/cve/CVE-2026-3634 vdb-entry, x_refsource_REDHAT
- RHBZ#2445129 issue-tracking, x_refsource_REDHAT
- https://gitlab.gnome.org/GNOME/libsoup/-/issues/485