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Amazon Linux 2023 : libsoup, libsoup-devel (ALAS2023-2026-1758)
high Nessus Plugin ID 316949
Synopsis
The remote Amazon Linux 2023 host is missing a security update.Description
It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1758 advisory.OOB Read via Integer Overflow on libsoup through libsoup/websocket/soup-websocket-connection.c via process_frame() leads to Undefined Behavior (CVE-2026-0716)
A flaw was found in libsoup, an HTTP client library. This vulnerability, known as CRLF (Carriage Return Line Feed) Injection, occurs when an HTTP proxy is configured and the library improperly handles URL- decoded input used to create the Host header. A remote attacker can exploit this by providing a specially crafted URL containing CRLF sequences, allowing them to inject additional HTTP headers or complete HTTP request bodies. This can lead to unintended or unauthorized HTTP requests being forwarded by the proxy, potentially impacting downstream services. (CVE-2026-1467)
A flaw was found in SoupServer. This HTTP request smuggling vulnerability occurs because SoupServer improperly handles requests that combine Transfer-Encoding: chunked and Connection: keep-alive headers. A remote, unauthenticated client can exploit this by sending specially crafted requests, causing SoupServer to fail to close the connection as required by RFC 9112. This allows the attacker to smuggle additional requests over the persistent connection, leading to unintended request processing and potential denial-of- service (DoS) conditions. (CVE-2026-1760)
A flaw was found in libsoup. This stack-based buffer overflow vulnerability occurs during the parsing of multipart HTTP responses due to an incorrect length calculation. A remote attacker can exploit this by sending a specially crafted multipart HTTP response, which can lead to memory corruption. This issue may result in application crashes or arbitrary code execution in applications that process untrusted server responses, and it does not require authentication or user interaction. (CVE-2026-1761)
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, such as lone line feed (LF) characters instead of the required carriage return and line feed (CRLF). A remote attacker can exploit this without authentication or user interaction by sending specially crafted chunked requests. This allows libsoup to parse and process multiple HTTP requests from a single network message, potentially leading to information disclosure. (CVE-2026-1801)
A flaw was found in libsoup. When establishing HTTPS tunnels through a configured HTTP proxy, sensitive session cookies are transmitted in cleartext within the initial HTTP CONNECT request. A network-positioned attacker or a malicious HTTP proxy can intercept these cookies, leading to potential session hijacking or user impersonation. (CVE-2026-5119)
Tenable has extracted the preceding description block directly from the tested product security advisory.
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
See Also
https://alas.aws.amazon.com//AL2023/ALAS2023-2026-1758.html
https://alas.aws.amazon.com/faqs.html
https://explore.alas.aws.amazon.com/CVE-2026-0716.html
https://explore.alas.aws.amazon.com/CVE-2026-1467.html
https://explore.alas.aws.amazon.com/CVE-2026-1760.html
https://explore.alas.aws.amazon.com/CVE-2026-1761.html
Plugin Details
Severity: High
ID: 316949
File Name: al2023_ALAS2023-2026-1758.nasl
Version: 1.1
Type: Local
Agent: unix
Published: 5/27/2026
Updated: 5/27/2026
Supported Sensors: Nessus Agent, Continuous Assessment, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5.5
CVSS v2
Risk Factor: High
Base Score: 8.5
Temporal Score: 6.7
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:P/A:N
CVSS Score Source: CVE-2026-5119
CVSS v3
Risk Factor: High
Base Score: 8.2
Temporal Score: 7.4
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
CVSS v4
Risk Factor: High
Base Score: 8.8
Threat Score: 7.8
Threat Vector: CVSS:4.0/E:P
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:L/SI:L/SA:L
CVSS Score Source: CVE-2026-1761
Vulnerability Information
CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:libsoup, p-cpe:/a:amazon:linux:libsoup-debuginfo, p-cpe:/a:amazon:linux:libsoup-debugsource, p-cpe:/a:amazon:linux:libsoup-devel, p-cpe:/a:amazon:linux:libsoup-doc
Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 5/25/2026
Vulnerability Publication Date: 1/13/2026
Reference Information
CVE: CVE-2026-0716, CVE-2026-1467, CVE-2026-1760, CVE-2026-1761, CVE-2026-1801, CVE-2026-5119
IAVA: 2026-A-0139-S, 2026-A-0429