What is CVE-2026-1801?

CVE-2026-1801 is a medium-severity vulnerability in Gnome Libsoup, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 5.3/10. Published 2026-02-03.

How severe is CVE-2026-1801?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Gnome Libsoup

CVE-2026-1801

A flaw was found in libsoup, an HTTP client/server library. This HTTP Request Smuggling vulnerability arises from non-RFC-compliant parsing in the soup_filter_input_stream_read_line() logic, where libsoup accepts malformed chunk headers, s…

Vulnerability class: HTTP Request Smuggling

EPSS: 0.004 (30.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Gnome Libsoup
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Redhat Enterprise_linux — versions 6.0, 7.0, 8.0

Weakness classification (CWE)

CWE-444 — Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling)

References

secalert@redhat.com (x_refsource_REDHAT, vdb-entry, Vendor Advisory)
secalert@redhat.com (x_refsource_REDHAT, issue-tracking, Issue Tracking, Vendor Advisory)
secalert@redhat.com (Issue Tracking)

Frequently asked questions

What is CVE-2026-1801?: CVE-2026-1801 is a medium-severity vulnerability in Gnome Libsoup, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 5.3/10. Published 2026-02-03.
How severe is CVE-2026-1801?: Medium severity. CVSS v3 base score is 5.3 out of 10.