Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, parse_options_header parsed Content-Disposition (and Content-Type) headers with email.message.Message, which transparently applies RFC 2231/5987 decoding. The extended parameter syntax (filename*=charset'lang'value, name*=..., and the filename*0/filename*1 continuation form) is decoded and surfaced under the bare filename/name key, and overrides the plain parameter when both are present. RFC 7578 §4.2 explicitly forbids the filename* form in multipart/form-data. Components that follow RFC 7578, or that do not implement RFC 2231/5987 decoding for multipart/form-data (WAFs, proxies, gateways), may interpret such a header differently. An attacker can exploit that difference to smuggle a different field name or filename past an upstream inspector to the backend. 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, parse_options_header parsed     Content-Disposition (and Content-Type) headers with email.message.Message, which transparently applies RFC     2231/5987 decoding. The extended parameter syntax (filename*=charset'lang'value, name*=..., and the     filename*0/filename*1 continuation form) is decoded and surfaced under the bare filename/name key, and     overrides the plain parameter when both are present. RFC 7578 4.2 explicitly forbids the filename* form     in multipart/form-data. Components that follow RFC 7578, or that do not implement RFC 2231/5987 decoding     for multipart/form-data (WAFs, proxies, gateways), may interpret such a header differently. An attacker     can exploit that difference to smuggle a different field name or filename past an upstream inspector to     the backend. This vulnerability is fixed in 0.0.30. (CVE-2026-53537)

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, parse_options_header parsed
    Content-Disposition (and Content-Type) headers with email.message.Message, which transparently applies RFC
    2231/5987 decoding. The extended parameter syntax (filename*=charset'lang'value, name*=..., and the
    filename*0/filename*1 continuation form) is decoded and surfaced under the bare filename/name key, and
    overrides the plain parameter when both are present. RFC 7578 §4.2 explicitly forbids the filename* form
    in multipart/form-data. Components that follow RFC 7578, or that do not implement RFC 2231/5987 decoding
    for multipart/form-data (WAFs, proxies, gateways), may interpret such a header differently. An attacker
    can exploit that difference to smuggle a different field name or filename past an upstream inspector to
    the backend. This vulnerability is fixed in 0.0.30. (CVE-2026-53537)

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
322155	Linux Distros Unpatched Vulnerability : CVE-2026-53537	Nessus	Misc.	medium
443225	SCA: security update for python-multipart (GHSA-vffw-93wf-4j4q)	Tenable Cloud Security	SCA Checks	medium
443225	SCA: security update for python-multipart (GHSA-vffw-93wf-4j4q)	Tenable Self-Hosted Container Security	SCA Checks	medium

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CVE-2026-53537

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