{"id":"CVE-2020-1913","aliases":["GHSA-gmpm-xp43-f7g6"],"url":"https://o3.security/vulnerability/CVE-2020-1913","summary":"Signed to Unsigned Conversion Error in Facebook Hermes","details":"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.","published":"2020-09-09T19:15:21.007Z","modified":"2026-07-09T00:21:24.983438Z","cvss":{"score":8.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"hermes-engine","fixedVersion":"0.5.2"}],"fix":{"url":"https://github.com/facebook/hermes/commit/2c7af7ec481ceffd0d14ce2d7c045e475fd71dc6","label":"facebook/hermes@2c7af7e"},"references":[{"type":"ADVISORY","url":"https://www.facebook.com/security/advisories/cve-2020-1913"},{"type":"FIX","url":"https://github.com/facebook/hermes/commit/2c7af7ec481ceffd0d14ce2d7c045e475fd71dc6"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T00:21:24.983438Z"}}