Vulnerability in GNOME Libsoup

CVE-2026-1536

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.

Vulnerability class: CRLF Injection

EPSS: 0.003 (23.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-1536?
CVE-2026-1536 is a medium-severity vulnerability in GNOME Libsoup, classified under CRLF Injection. CVSS score: 5.8/10. Published 2026-01-28.
How severe is CVE-2026-1536?
Medium severity. CVSS v3 base score is 5.8 out of 10.