{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-05-10T13:07:38.829","vulnerabilities":[{"cve":{"id":"CVE-2026-39855","sourceIdentifier":"security-advisories@github.com","published":"2026-04-09T17:16:29.140","lastModified":"2026-04-17T20:00:55.620","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"osslsigncode is a tool that implements Authenticode signing and timestamping. Prior to 2.13, an integer underflow vulnerability exists in osslsigncode version 2.12 and earlier in the PE page-hash computation code (pe_page_hash_calc()). When page hash processing is performed on a PE file, the function subtracts hdrsize from pagesize without first validating that pagesize >= hdrsize. If a malicious PE file sets SizeOfHeaders (hdrsize) larger than SectionAlignment (pagesize), the subtraction underflows and produces a very large unsigned length. The code allocates a zero-filled buffer of pagesize bytes and then attempts to hash pagesize - hdrsize bytes from that buffer. After the underflow, this results in an out-of-bounds read from the heap and can crash the process. The vulnerability can be triggered while signing a malicious PE file with page hashing enabled (-ph), or while verifying a malicious signed PE file that already contains page hashes. Verification of an already signed file does not require the verifier to pass -ph. This vulnerability is fixed in 2.13."}],"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:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Primary","description":[{"lang":"en","value":"CWE-125"},{"lang":"en","value":"CWE-190"},{"lang":"en","value":"CWE-191"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:osslsigncode_project:osslsigncode:*:*:*:*:*:*:*:*","versionEndExcluding":"2.13","matchCriteriaId":"3F16716F-B2C3-41F9-B32B-CFD011129F12"}]}]}],"references":[{"url":"https://github.com/mtrojnar/osslsigncode/commit/2a5409b7c4b6c6fad2b093531e8fea6cf08e1568","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/mtrojnar/osslsigncode/releases/tag/2.13","source":"security-advisories@github.com","tags":["Product","Release Notes"]},{"url":"https://github.com/mtrojnar/osslsigncode/security/advisories/GHSA-76vv-x5rr-q3mr","source":"security-advisories@github.com","tags":["Patch","Vendor Advisory"]}]}}]}