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        "text": "This update for python-python-multipart fixes the following issues\n\n- CVE-2026-53537: multipart/form-data with extended parameters can lead to file or parameter smuggling (bsc#1268506).\n- CVE-2026-53538: urlencoded requests containing semicolons can lead to form field smuggling (bsc#1268496).\n- CVE-2026-53539: small crafted body can cause a denial of service (bsc#1268500).\n- CVE-2026-53540: crafted request buffers can lead to degrading availability (bsc#1268488).\n",
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          "category": "general",
          "text": "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\u0027lang\u0027value, 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.",
          "title": "CVE description"
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            "version": "3.1"
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          "text": "https://www.suse.com/security/cve/CVE-2026-53538"
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        {
          "category": "general",
          "text": "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 \u0026. The WHATWG URL standard, modern browsers, and Python\u0027s urllib.parse (since the CVE-2021-23336 fix) treat only \u0026 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.",
          "title": "CVE description"
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          "summary": "CVE-2026-53538",
          "url": "https://www.suse.com/security/cve/CVE-2026-53538"
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          "category": "external",
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          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
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        {
          "category": "general",
          "text": "Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, when parsing application/x-www-form-urlencoded bodies, QuerystringParser located the field separator with a two step lookup: it first scanned the entire remaining buffer for \u0026, and only when no \u0026 existed anywhere ahead did it fall back to scanning for ;. For a body that uses ; as the separator and contains no \u0026, every field iteration performed a full failed \u0026 scan over the entire remaining buffer before locating the nearby ;. With N semicolon separated fields in a chunk of size B, this yields O(B^2) byte comparisons per chunk. An attacker can submit a small crafted body of the form a;a;a;... and cause the parser to spend seconds of CPU per request. A handful of concurrent requests can exhaust worker processes. This vulnerability is fixed in 0.0.30.",
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          "summary": "CVE-2026-53539",
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          "category": "external",
          "summary": "SUSE Bug 1268500 for CVE-2026-53539",
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            "SUSE Linux Enterprise Server for SAP applications 16.0:python313-python-multipart-0.0.20-160000.5.1.noarch"
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          "text": "https://www.suse.com/security/cve/CVE-2026-53540"
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        {
          "category": "general",
          "text": "Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.31, parse_form() did not validate the Content-Length header before using it to bound its chunked read of the request body. A negative Content-Length turned the bounded read into a read-until-EOF, so the entire body was loaded into memory in a single read instead of in fixed-size chunks. This vulnerability is fixed in 0.0.31.",
          "title": "CVE description"
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}