{"id":"CVE-2026-44368","aliases":["EUVD-2026-30161","GHSA-7r92-3jgr-r65q","PYSEC-2026-3028"],"status":"published","title":"PyQuorum: Timing side‑channel in mul_mod","description":"PyQuorum is a cryptographic library for secret sharing and key management. Prior to 0.2.1, the mul_mod function implements multiplication via a binary expansion loop whose execution time depends on the Hamming weight of the second operand (the exponent). An attacker who can measure the time of secret‑sharing operations (e.g., via a remote service) could progressively recover the values of shares, ultimately leading to secret reconstruction. This vulnerability is fixed in 0.2.1.","severity":{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00314,"percentile":0.24642,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-208"],"published":"2026-05-06T22:40:15Z","modified":"2026-10-28T02:30:41Z","fixes":[{"ecosystem":"PyPI","package":"pyquorum","fixed_in":["0.2.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"pyquorum","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.2.1"}]}]},{"source":"osv","ecosystem":"PyPI","package":"pyquorum","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.2.1"}]}],"versions":["0.1.0","0.1.1","0.1.2","0.1.3","0.2.0"]},{"source":"osv","ecosystem":"PyPI","package":"pyquorum","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.2.1"}]}],"versions":["0.1.0","0.1.1","0.1.2","0.1.3","0.2.0"]}],"products":[{"vendor":"svvqt","product":"pyquorum"}],"references":[{"url":"https://github.com/svvqt/pyquorum/security/advisories/GHSA-7r92-3jgr-r65q","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/svvqt/pyquorum/commit/1e9ac41dd3c305c13d7a6b7d227bf325be82d730","tags":["web"]},{"url":"https://github.com/svvqt/pyquorum/releases/tag/v0.2.1","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44368","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-7r92-3jgr-r65q","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44368.json","tags":["advisory"]},{"url":"https://github.com/svvqt/pyquorum","tags":["package"]},{"url":"https://pypi.org/project/pyquorum","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-44368","title":"PyQuorum: Timing side‑channel in mul_mod","description":"PyQuorum is a cryptographic library for secret sharing and key management. Prior to 0.2.1, the mul_mod function implements multiplication via a binary expansion loop whose execution time depends on the Hamming weight of the second operand (the exponent). An attacker who can measure the time of secret‑sharing operations (e.g., via a remote service) could progressively recover the values of shares, ultimately leading to secret reconstruction. This vulnerability is fixed in 0.2.1.","status":"published","published":"2026-05-13T20:18:12.91Z","modified":"2026-05-15T18:44:14.203Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T13:43:00.288193Z"}],"euvd":[{"id":"EUVD-2026-30161","description":"PyQuorum is a cryptographic library for secret sharing and key management. Prior to 0.2.1, the mul_mod function implements multiplication via a binary expansion loop whose execution time depends on the Hamming weight of the second operand (the exponent). An attacker who can measure the time of secret‑sharing operations (e.g., via a remote service) could progressively recover the values of shares, ultimately leading to secret reconstruction. This vulnerability is fixed in 0.2.1.","status":"published","published":"2026-05-13T20:18:12Z","modified":"2026-05-15T18:44:14Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T19:04:28.290329Z"}],"ghsa":[{"id":"GHSA-7r92-3jgr-r65q","title":"pyquorum: Timing side‑channel in mul_mod","description":"### Impact\nThe `mul_mod` function implements multiplication via a binary expansion loop whose execution time depends on the Hamming weight of the second operand (the exponent). An attacker who can measure the time of secret‑sharing operations (e.g., via a remote service) could progressively recover the values of shares, ultimately leading to secret reconstruction.\n\n### Patches\nhttps://github.com/svvqt/pyquorum/releases/tag/v0.2.1","status":"published","published":"2026-05-06T22:40:15Z","modified":"2026-05-14T20:42:46Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T14:40:10.269075Z"}],"nvd":[{"id":"CVE-2026-44368","description":"PyQuorum is a cryptographic library for secret sharing and key management. Prior to 0.2.1, the mul_mod function implements multiplication via a binary expansion loop whose execution time depends on the Hamming weight of the second operand (the exponent). An attacker who can measure the time of secret‑sharing operations (e.g., via a remote service) could progressively recover the values of shares, ultimately leading to secret reconstruction. This vulnerability is fixed in 0.2.1.","status":"published","published":"2026-05-13T21:16:47.73Z","modified":"2026-10-26T14:10:00.13Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/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":"medium","assessor":"secondary"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T14:12:19.020465Z"}],"osv":[{"id":"CVE-2026-44368","title":"PyQuorum: Timing side‑channel in mul_mod","description":"PyQuorum is a cryptographic library for secret sharing and key management. Prior to 0.2.1, the mul_mod function implements multiplication via a binary expansion loop whose execution time depends on the Hamming weight of the second operand (the exponent). An attacker who can measure the time of secret‑sharing operations (e.g., via a remote service) could progressively recover the values of shares, ultimately leading to secret reconstruction. This vulnerability is fixed in 0.2.1.","status":"published","published":"2026-05-13T20:18:12.91Z","modified":"2026-10-28T02:30:41.547296233Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T15:45:04.820169Z"},{"id":"GHSA-7r92-3jgr-r65q","title":"pyquorum: Timing side‑channel in mul_mod","description":"### Impact\nThe `mul_mod` function implements multiplication via a binary expansion loop whose execution time depends on the Hamming weight of the second operand (the exponent). An attacker who can measure the time of secret‑sharing operations (e.g., via a remote service) could progressively recover the values of shares, ultimately leading to secret reconstruction.\n\n### Patches\nhttps://github.com/svvqt/pyquorum/releases/tag/v0.2.1","status":"published","published":"2026-05-06T22:40:15Z","modified":"2026-07-13T16:43:13.169816775Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T15:46:41.349637Z"},{"id":"PYSEC-2026-3028","title":"pyquorum: Timing side‑channel in mul_mod","description":"### Impact\nThe `mul_mod` function implements multiplication via a binary expansion loop whose execution time depends on the Hamming weight of the second operand (the exponent). An attacker who can measure the time of secret‑sharing operations (e.g., via a remote service) could progressively recover the values of shares, ultimately leading to secret reconstruction.\n\n### Patches\nhttps://github.com/svvqt/pyquorum/releases/tag/v0.2.1","status":"published","published":"2026-07-13T15:15:40.283674Z","modified":"2026-07-13T16:33:10.077069776Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T15:52:56.429374Z"}]}}