{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-06-21T14:14:38.638","vulnerabilities":[{"cve":{"id":"CVE-2026-39853","sourceIdentifier":"security-advisories@github.com","published":"2026-04-09T16:16:31.233","lastModified":"2026-06-17T10:42:42.257","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"osslsigncode is a tool that implements Authenticode signing and timestamping. Prior to 2.12, A stack buffer overflow vulnerability exists in osslsigncode in several signature verification paths. During verification of a PKCS#7 signature, the code copies the digest value from a parsed SpcIndirectDataContent structure into a fixed-size stack buffer  (mdbuf[EVP_MAX_MD_SIZE], 64 bytes) without validating that the source length fits within the destination buffer. This pattern is present in the verification handlers for PE, MSI, CAB, and script files. An attacker can craft a malicious signed file with an oversized digest field in SpcIndirectDataContent. When a user verifies such a file with osslsigncode verify, the unbounded memcpy can overflow the stack buffer and corrupt adjacent stack state. This vulnerability is fixed in 2.12."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"mtrojnar","product":"osslsigncode","versions":[{"version":"< 2.12","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-04-09T16:13:50.325421Z","id":"CVE-2026-39853","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-121"},{"lang":"en","value":"CWE-787"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:osslsigncode_project:osslsigncode:*:*:*:*:*:*:*:*","versionEndExcluding":"2.12","matchCriteriaId":"99F63D36-1A36-4A6E-A2A3-02B68D5BA069"}]}]}],"references":[{"url":"https://github.com/mtrojnar/osslsigncode/commit/cbee1e723c5a8547302bd841ad9943ed8144db68","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/mtrojnar/osslsigncode/releases/tag/2.12","source":"security-advisories@github.com","tags":["Product","Release Notes"]},{"url":"https://github.com/mtrojnar/osslsigncode/security/advisories/GHSA-hx87-8754-xvh4","source":"security-advisories@github.com","tags":["Vendor Advisory"]}]}}]}