CVE-2026-64855

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{}

{"affected": [{"affectedData": [{"product": "soapbar", "vendor": "hitoshyamamoto", "versions": [{"status": "affected", "version": "< 0.13.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "soapbar is a SOAP library for Python \u2014 client, server, and WSDL handling. Prior to version 0.13.0, verify_envelope_bsp() derived its trust anchor from the message it was verifying. It read the X.509 certificate out of the caller-untrusted wsse:BinarySecurityToken, validated only that certificate's not-before / not-after dates, and then verified the signature against that same certificate. There was no CA-chain validation, no issuer/subject allowlist, and no pinning. A successful verify_envelope_bsp() therefore proved only that the envelope was signed by whoever supplied the embedded certificate \u2014 never that it was signed by a trusted party. An attacker who mints their own certificate, signs a forged envelope, and embeds that certificate in the token passes verification. Any consumer that treats a successful BSP verification as authentication can be impersonated (signature forgery / authentication bypass). verify_envelope() (which pins a caller-supplied x509_cert) was not affected \u2014 the flaw was specific to the BSP variant whose trust anchor came from the message. This issue has been patched in version 0.13.0."}], "id": "CVE-2026-64855", "lastModified": "2026-11-12T22:18:51.470", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.2, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64855", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-12T19:35:40.490316Z", "version": "2.0.3"}}]}, "published": "2026-11-11T16:17:25.370", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/hitoshyamamoto/soapbar/pull/71"}, {"source": "security-advisories@github.com", "url": "https://github.com/hitoshyamamoto/soapbar/releases/tag/v0.13.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/hitoshyamamoto/soapbar/security/advisories/GHSA-859w-52fx-hcm6"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-295"}, {"lang": "en", "value": "CWE-347"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"created": "2026-11-12T20:15:08.435788+00:00", "updated": "2026-11-12T20:15:08.435796+00:00", "vendors": []}