CVE-2020-1913

8.1 highEPSS 1.2%

High (8.1) in facebook hermes. EPSS 1.2% chance of exploitation in the next 30 days. Fixed in hermes-engine 0.5.2.

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

CVSS 3.1

8.1 high

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 1.2% chance of exploitation in the next 30 days; higher than 68% of CVEs (scores of 2026-10-31)
CWEs: CWE-681, CWE-195
Published: 2020-09-09
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

facebook:hermes

Packages (OSV)

Advisory	Ecosystem	Package	Affected	Fixed in
GHSA-gmpm-xp43-f7g6	npm	hermes-engine	<0.5.2	0.5.2

References

https://github.com/facebook/hermes/commit/2c7af7ec481ceffd0d14ce2d7c045e475fd71dc6
https://www.facebook.com/security/advisories/cve-2020-1913
https://github.com/facebook/hermes/commit/2c7af7ec481ceffd0d14ce2d7c045e475fd71dc6
https://www.facebook.com/security/advisories/cve-2020-1913

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