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{"affected": [{"affectedData": [{"product": "python-multipart", "vendor": "Kludex", "versions": [{"status": "affected", "version": "< 0.0.30"}]}], "source": "[email protected]"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:fastapiexpert:python-multipart:*:*:*:*:*:python:*:*", "matchCriteriaId": "381A8F1D-278D-409F-974A-898BE65DB20C", "versionEndExcluding": "0.0.30", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-53538", "lastModified": "2026-06-26T19:52:35.633", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 1.4, "source": "[email protected]", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53538", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-23T14:49:11.715345Z", "version": "2.0.3"}}]}, "published": "2026-06-22T18:16:44.223", "references": [{"source": "[email protected]", "tags": ["Vendor Advisory"], "url": "https://github.com/Kludex/python-multipart/security/advisories/GHSA-6jv3-5f52-599m"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-436"}, {"lang": "en", "value": "CWE-444"}], "source": "[email protected]", "type": "Secondary"}]}

{"bugzilla": {"description": "python-multipart: Python-Multipart: Information disclosure due to parser differential in form data handling", "id": "2491466", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2491466"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-1288", "details": ["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.", "A flaw was found in Python-Multipart, a tool used for processing web form data. A remote attacker could exploit a vulnerability where the software incorrectly interprets certain characters as separators in web form data. This difference in interpretation compared to standard web practices allows an attacker to bypass security checks and inject additional data fields. This could lead to unauthorized information disclosure."], "mitigation": {"lang": "en:us", "value": "Upgrade to python-multipart 0.0.30 or later, which treats only & as a field separator per the WHATWG URL standard. ; is parsed as ordinary field data, matching urllib.parse, browsers, and other compliant parsers."}, "name": "CVE-2026-53538", "package_state": [{"cpe": "cpe:/a:redhat:exploit_intelligence:0", "fix_state": "Fix deferred", "package_name": "exploit-intelligence-tech-preview/vulnerability-analysis-rhel9", "product_name": "Exploit Intelligence"}, {"cpe": "cpe:/a:redhat:lightspeed_core", "fix_state": "Not affected", "package_name": "lightspeed-core/lightspeed-stack-rhel9", "product_name": "Lightspeed Core"}, {"cpe": "cpe:/a:redhat:lightspeed_core", "fix_state": "Not affected", "package_name": "lightspeed-core/rag-tool-cpu-rhel9", "product_name": "Lightspeed Core"}, {"cpe": "cpe:/a:redhat:lightspeed_core", "fix_state": "Not affected", "package_name": 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Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/iop-host-inventory-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/iop-vmaas-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/iop-vulnerability-engine-rhel9", "product_name": "Red Hat Satellite 6"}], "public_date": "2026-06-22T16:56:32Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53538\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53538\nhttps://github.com/Kludex/python-multipart/security/advisories/GHSA-6jv3-5f52-599m"], "statement": "A flaw was found in python-multipart. The `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` only treat `&` as a separator. This parser differential allows an attacker to smuggle extra form fields past an upstream body-inspecting component (e.g., a WAF or API gateway), resulting in HTTP parameter pollution. This is the same class of issue as CVE-2021-23336 in CPython's `urllib.parse`.", "threat_severity": "Moderate"}

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