Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, QuerystringParser treated ; as a field separator in application/x-www-form-urlencoded bodies, in addition to &. The WHATWG URL standard, modern browsers, and Python's urllib.parse (since the CVE-2021-23336 fix) treat only & as a separator. This creates a parser differential: the same bytes are tokenized into different fields than a WHATWG compliant intermediary would produce, allowing an attacker to smuggle extra form fields past an upstream body inspecting component. This vulnerability is fixed in 0.0.30.

The remote SUSE Linux SLES16 / SLES_SAP16 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:22372-1 advisory.

    This update for python-python-multipart fixes the following issues

    - CVE-2026-53537: multipart/form-data with extended parameters can lead to file or parameter smuggling     (bsc#1268506).
    - CVE-2026-53538: urlencoded requests containing semicolons can lead to form field smuggling     (bsc#1268496).
    - CVE-2026-53539: small crafted body can cause a denial of service (bsc#1268500).
    - CVE-2026-53540: crafted request buffers can lead to degrading availability (bsc#1268488).

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 a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21066-1 advisory.

    This update for python-python-multipart fixes the following issues

    - CVE-2026-53537: multipart/form-data with extended parameters can lead to file or parameter smuggling     (bsc#1268506).
    - CVE-2026-53538: urlencoded requests containing semicolons can lead to form field smuggling     (bsc#1268496).
    - CVE-2026-53539: small crafted body can cause a denial of service (bsc#1268500).
    - CVE-2026-53540: crafted request buffers can lead to degrading availability (bsc#1268488).

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

  - Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, QuerystringParser treated ;
    as a field separator in application/x-www-form-urlencoded bodies, in addition to &. The WHATWG URL     standard, modern browsers, and Python's urllib.parse (since the CVE-2021-23336 fix) treat only & as a     separator. This creates a parser differential: the same bytes are tokenized into different fields than a     WHATWG compliant intermediary would produce, allowing an attacker to smuggle extra form fields past an     upstream body inspecting component. This vulnerability is fixed in 0.0.30. (CVE-2026-53538)

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

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, QuerystringParser treated ;
    as a field separator in application/x-www-form-urlencoded bodies, in addition to &. The WHATWG URL
    standard, modern browsers, and Python's urllib.parse (since the CVE-2021-23336 fix) treat only & as a
    separator. This creates a parser differential: the same bytes are tokenized into different fields than a
    WHATWG compliant intermediary would produce, allowing an attacker to smuggle extra form fields past an
    upstream body inspecting component. This vulnerability is fixed in 0.0.30. (CVE-2026-53538)

ID	Name	Product	Family	Severity
324845	SUSE SLES16 Security Update : python-python-multipart (SUSE-SU-2026:22372-1)	Nessus	SuSE Local Security Checks	medium
324071	openSUSE 16 Security Update : python-python-multipart (openSUSE-SU-2026:21066-1)	Nessus	SuSE Local Security Checks	medium
322156	Linux Distros Unpatched Vulnerability : CVE-2026-53538	Nessus	Misc.	low
443224	SCA: security update for python-multipart (GHSA-6jv3-5f52-599m)	Tenable Cloud Security	SCA Checks	low
443224	SCA: security update for python-multipart (GHSA-6jv3-5f52-599m)	Tenable Self-Hosted Container Security	SCA Checks	low

Detections

Analytics

CVE-2026-53538

low

Tenable Plugins

medium

medium

low

low

low