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.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1460 advisory.

    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. (CVE-2026-1536)

    A flaw was found in the libsoup HTTP library that can cause proxy authentication credentials to be sent to     unintended destinations. When handling HTTP redirects, libsoup removes the Authorization header but does     not remove the Proxy-Authorization header if the request is redirected to a different host. As a result,     sensitive proxy credentials may be leaked to third-party servers. Applications using libsoup for HTTP     communication may unintentionally expose proxy authentication data. (CVE-2026-1539)

    libsoup: heap buffer overflow in soup_content_sniffer_sniff (CVE-2026-2369)

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.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0579-1 advisory.

    - CVE-2026-1536: Always validate the headers value when coming from untrusted source to avoid HTTP header     injection       (bsc#1257440).
    - CVE-2026-1761: Check length of bytes read in soup_filter_input_stream_read_until to avoid a stack-based     buffer overflow       (bsc#1257598).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0431-1 advisory.

    - CVE-2026-1536: Always validate the headers value when coming from untrusted source to avoid HTTP header     injection. (bsc#1257440)
    - CVE-2026-1761: Check length of bytes read in soup_filter_input_stream_read_until to avoid a stack-based     buffer overflow. (bsc#1257598)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:20186-1 advisory.

    - CVE-2026-1536: HTTP header injection or response splitting via CRLF injection in the Content-Disposition     header       (bsc#1257440).
    - CVE-2026-1761: incorrect length calculation when parsing of multipart HTTP responses can lead to a     stack-based       buffer overflow (bsc#1257598).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8020-1 advisory.

    It was discovered that libsoup did not correctly handle certain URL-decoded input, which could allow for     HTTP header injection. A remote attacker could possibly use this issue to cause a denial of service or     execute arbitrary code. (CVE-2026-1467, CVE-2026-1536)

    It was discovered that libsoup did not correctly handle removal of the Proxy-Authorization header. A     remote attacker could possibly use this issue to leak sensitive information. (CVE-2026-1539)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-1536)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
301358	Amazon Linux 2023 : libsoup3, libsoup3-devel (ALAS2023-2026-1460)	Nessus	Amazon Linux Local Security Checks	medium
299657	SUSE SLES15 Security Update : libsoup (SUSE-SU-2026:0579-1)	Nessus	SuSE Local Security Checks	high
298737	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : libsoup (SUSE-SU-2026:0431-1)	Nessus	SuSE Local Security Checks	high
298722	openSUSE 16 Security Update : libsoup (openSUSE-SU-2026:20186-1)	Nessus	SuSE Local Security Checks	high
298468	Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : libsoup vulnerabilities (USN-8020-1)	Nessus	Ubuntu Local Security Checks	medium
297046	Linux Distros Unpatched Vulnerability : CVE-2026-1536	Nessus	Misc.	medium

Detections

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CVE-2026-1536

medium

Tenable Plugins

medium

high

high

high

medium

medium