{"id":"CVE-2026-6924","aliases":["EUVD-2026-48399","GHSA-wm5h-r2qh-r97h"],"status":"published","title":"Weak entropy initialization in Silicon Labs Matter SiWx917 TinyCrypt path","description":"A bug in the entropy initialization for SiWx917 causes the DRBG to use a predictable seed. As such, all random numbers generated in the Matter code use the same stream of numbers. This vulnerability was discovered after the impacted repository was already deprecated.","severity":{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00445,"percentile":0.38935,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-336"],"published":"2026-07-23T21:05:22Z","modified":"2026-10-28T02:31:07Z","products":[{"vendor":"silicon labs","product":"silicon labs matter github"}],"references":[{"url":"https://siliconlabs.lightning.force.com/sfc/servlet.shepherd/document/download/a45Vm0000009SzZIAU?operationContext=S1","tags":["vendor-advisory","permissions-required","report"]},{"url":"https://github.com/SiliconLabs/matter/tree/release_2.3.1-1.3","tags":["patch","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6924","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-wm5h-r2qh-r97h"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6924.json","tags":["advisory"]},{"url":"https://github.com/SiliconLabs/simplicity_sdk","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-6924","title":"Weak entropy initialization in Silicon Labs Matter SiWx917 TinyCrypt path","description":"A bug in the entropy initialization for SiWx917 causes the DRBG to use a predictable seed. As such, all random numbers generated in the Matter code use the same stream of numbers. This vulnerability was discovered after the impacted repository was already deprecated.","status":"published","published":"2026-07-23T21:05:22.113Z","modified":"2026-07-24T13:40:36.22Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna"}],"cwes":["CWE-336"],"updated_at":"2026-11-02T13:50:04.986624Z"}],"euvd":[{"id":"EUVD-2026-48399","description":"A bug in the entropy initialization for SiWx917 causes the DRBG to use a predictable seed. As such, all random numbers generated in the Matter code use the same stream of numbers. This vulnerability was discovered after the impacted repository was already deprecated.","status":"published","published":"2026-07-23T21:05:22Z","modified":"2026-07-24T13:40:36Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T18:19:40.671085Z"}],"ghsa":[{"id":"GHSA-wm5h-r2qh-r97h","title":"A bug in the entropy initialization for SiWx917 causes the DRBG to use a predictable seed. As...","description":"A bug in the entropy initialization for SiWx917 causes the DRBG to use a predictable seed. As such, all random numbers generated in the Matter code use the same stream of numbers. This vulnerability was discovered after the impacted repository was already deprecated.","status":"published","published":"2026-07-23T21:31:03Z","modified":"2026-07-23T21:31:09Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"cwes":["CWE-336"],"updated_at":"2026-11-02T15:09:45.375488Z"}],"nvd":[{"id":"CVE-2026-6924","description":"A bug in the entropy initialization for SiWx917 causes the DRBG to use a predictable seed. As such, all random numbers generated in the Matter code use the same stream of numbers. This vulnerability was discovered after the impacted repository was already deprecated.","status":"published","published":"2026-07-23T21:17:05.447Z","modified":"2026-10-24T13:10:00.147Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"}],"cwes":["CWE-336"],"updated_at":"2026-11-02T14:12:32.473901Z"}],"osv":[{"id":"CVE-2026-6924","title":"Weak entropy initialization in Silicon Labs Matter SiWx917 TinyCrypt path","description":"A bug in the entropy initialization for SiWx917 causes the DRBG to use a predictable seed. As such, all random numbers generated in the Matter code use the same stream of numbers. This vulnerability was discovered after the impacted repository was already deprecated.","status":"published","published":"2026-07-23T21:05:22.113Z","modified":"2026-10-28T02:31:07.068254541Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-336"],"updated_at":"2026-11-02T15:45:15.164658Z"}]}}