{"id":"CVE-2020-1913","aliases":["EUVD-2022-3980","GHSA-gmpm-xp43-f7g6"],"status":"published","title":"Signed to Unsigned Conversion Error in Facebook Hermes","description":"An Integer signedness error in the JavaScript Interpreter in Facebook Hermes prior to commit 2c7af7ec481ceffd0d14ce2d7c045e475fd71dc6 allows attackers to cause a denial of service attack or a potential RCE via crafted JavaScript. Note that this is only exploitable if the application using Hermes permits evaluation of untrusted JavaScript. Hence, most React Native applications are not affected.","severity":{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.01202,"percentile":0.68453,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-195","CWE-681"],"published":"2020-09-09T19:00:19Z","modified":"2026-11-03T02:45:22Z","fixes":[{"ecosystem":"npm","package":"hermes-engine","fixed_in":["0.5.2"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"hermes-engine","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.4.3"},{"fixed":"0.5.2"}]}]},{"source":"osv","ecosystem":"npm","package":"hermes-engine","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.5.2"}]}]}],"products":[{"vendor":"facebook","product":"hermes"},{"vendor":"softwarepub","product":"hermes"}],"references":[{"url":"https://www.facebook.com/security/advisories/cve-2020-1913","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory","web"]},{"url":"https://github.com/facebook/hermes/commit/2c7af7ec481ceffd0d14ce2d7c045e475fd71dc6","tags":["x_refsource_CONFIRM","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-1913","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-gmpm-xp43-f7g6"}],"sources":{"cve":[{"id":"CVE-2020-1913","description":"An Integer signedness error in the JavaScript Interpreter in Facebook Hermes prior to commit 2c7af7ec481ceffd0d14ce2d7c045e475fd71dc6 allows attackers to cause a denial of service attack or a potential RCE via crafted JavaScript. Note that this is only exploitable if the application using Hermes permits evaluation of untrusted JavaScript. Hence, most React Native applications are not affected.","status":"published","published":"2020-09-09T19:00:19Z","modified":"2024-08-04T06:53:59.912Z","cwes":["CWE-195"],"updated_at":"2026-11-02T14:35:56.213477Z"}],"euvd":[{"id":"EUVD-2022-3980","description":"An Integer signedness error in the JavaScript Interpreter in Facebook Hermes prior to commit 2c7af7ec481ceffd0d14ce2d7c045e475fd71dc6 allows attackers to cause a denial of service attack or a potential RCE via crafted JavaScript. Note that this is only exploitable if the application using Hermes permits evaluation of untrusted JavaScript. Hence, most React Native applications are not affected.","status":"published","published":"2020-09-09T19:00:19Z","modified":"2024-08-04T06:53:59Z","updated_at":"2026-11-03T03:08:10.95725Z"}],"ghsa":[{"id":"GHSA-gmpm-xp43-f7g6","title":"Signed to Unsigned Conversion Error in Facebook Hermes","description":"An Integer signedness error in the JavaScript Interpreter in Facebook Hermes prior to commit 2c7af7ec481ceffd0d14ce2d7c045e475fd71dc6 allows attackers to cause a denial of service attack or a potential RCE via crafted JavaScript. Note that this is only exploitable if the application using Hermes permits evaluation of untrusted JavaScript. Hence, most React Native applications are not affected.","status":"published","published":"2022-05-24T17:27:39Z","modified":"2023-01-27T05:02:31Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-195","CWE-681"],"updated_at":"2026-11-02T14:36:18.427692Z"}],"nvd":[{"id":"CVE-2020-1913","description":"An Integer signedness error in the JavaScript Interpreter in Facebook Hermes prior to commit 2c7af7ec481ceffd0d14ce2d7c045e475fd71dc6 allows attackers to cause a denial of service attack or a potential RCE via crafted JavaScript. Note that this is only exploitable if the application using Hermes permits evaluation of untrusted JavaScript. Hence, most React Native applications are not affected.","status":"published","published":"2020-09-09T19:15:21.007Z","modified":"2026-06-17T03:02:36.257Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-195","CWE-681"],"updated_at":"2026-11-02T14:06:14.981587Z"}],"osv":[{"id":"CVE-2020-1913","description":"An Integer signedness error in the JavaScript Interpreter in Facebook Hermes prior to commit 2c7af7ec481ceffd0d14ce2d7c045e475fd71dc6 allows attackers to cause a denial of service attack or a potential RCE via crafted JavaScript. Note that this is only exploitable if the application using Hermes permits evaluation of untrusted JavaScript. Hence, most React Native applications are not affected.","status":"published","published":"2020-09-09T19:15:21.007Z","modified":"2026-11-03T07:05:07.516450746Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-03T07:52:02.098855Z"},{"id":"GHSA-gmpm-xp43-f7g6","title":"Signed to Unsigned Conversion Error in Facebook Hermes","description":"An Integer signedness error in the JavaScript Interpreter in Facebook Hermes prior to commit 2c7af7ec481ceffd0d14ce2d7c045e475fd71dc6 allows attackers to cause a denial of service attack or a potential RCE via crafted JavaScript. Note that this is only exploitable if the application using Hermes permits evaluation of untrusted JavaScript. Hence, most React Native applications are not affected.","status":"published","published":"2022-05-24T17:27:39Z","modified":"2023-11-08T04:02:45.193601Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-195","CWE-681"],"updated_at":"2026-11-02T15:46:48.191583Z"}]}}