{"affected":[{"defaultStatus":"unaffected","ecosystem":"github","packageName":"stefanschippers/xschem","product":"xschem","source":"CNA: VulnCheck","vendor":"Stefan Schippers","versions":[{"lessThanOrEqual":"3.4.7","status":"affected","version":"2.9.9","versionType":"custom"}]}],"cveId":"CVE-2026-128991","cwes":["CWE-125"],"description":"xschem 2.9.9 through 3.4.7 contains an out-of-bounds read vulnerability in read_xschem_file() in src/save.c that mishandles embedded-symbol records lacking a preceding instance. Attackers can supply a crafted schematic beginning with a \"[\" record, causing xschem to read and dereference memory below the instance array and crash.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":5.8,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","version":"4.0"},{"score":5.3,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H","version":"3.1"}],"modifiedAt":1794582101369,"publishedAt":1794582101369,"references":[{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/StefanSchippers/xschem/commit/e29af39c6133c36bdaf66603fd663231e75517f1"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/StefanSchippers/xschem/blob/3.4.7/src/save.c#L3138-L3141"},{"source":"CNA: VulnCheck","tags":["product"],"url":"https://github.com/StefanSchippers/xschem"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/xschem-2.9.9-through-3.4.7-out-of-bounds-read-via-read-xschem-file-embedded-symbol-record"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/StefanSchippers/xschem/commit/e29af39c6133c36bdaf66603fd663231e75517f1"}],"revision":"9206269bb34d8cdd2355339a8befdecd20f65056978d04dc9bb86c1d9956fc0b","sources":[{"modifiedAt":1794582101369,"name":"CNA: VulnCheck","retrievedAt":1794582615328,"url":"https://www.cve.org/CVERecord?id=CVE-2026-128991"}],"ssvc":null,"status":"published","title":"xschem 2.9.9 through 3.4.7 Out-of-Bounds Read via read_xschem_file() Embedded-Symbol Record","updatedAt":1794582615328}