SB20261001137 - Ubuntu update for libsoup2.4
Published: October 1, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) CRLF injection (CVE-ID: CVE-2026-1467)
CWE-ID: CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N]
The vulnerability allows a remote attacker to inject arbitrary data in server response.
The vulnerability exists due to insufficient validation of attacker-supplied data. A remote attacker can pass specially crafted HTTP request ta to the application containing CR-LF characters and modify application behavior.
2) Information disclosure (CVE-ID: CVE-2026-1539)
CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor
CVSSv4: 2.1 [CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N]
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to library does not remove data from Proxy-Authorization header when following redirects. A remote attacker can gain access to sensitive information passed via the Proxy-Authorization header.
3) Inconsistent interpretation of HTTP requests (CVE-ID: CVE-2026-1801)
CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')
CVSSv4: 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]
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.
Remediation
Install update from vendor's website.