CVE-2020-1913 json
Signed to Unsigned Conversion Error in Facebook Hermes
published 2020-09-09 6 y ago modified 2026-06-17 4 mo ago also GHSA-gmpm-xp43-f7g6 , EUVD-2022-3980
- cvss
- 8.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.2%
- EPSS 1.2% chance of exploitation in 30 days, percentile 68%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
Exploit prediction
1.20% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
| GitHub | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | hermes-engine | <0.5.2 |
0.5.2 |
Affected products
- Facebook Hermes
Classification
References
-
github.com
/facebook/hermes/commit/2c7af7ec481ceffd0d14ce2d7c045e475fd71dc6
web, patch, third-party-advisory
-
facebook.com
/security/advisories/cve-2020-1913
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2020-1913
advisory
Sources
- CVE List CVE-2020-1913
- GitHub Advisory GHSA-gmpm-xp43-f7g6
- NVD CVE-2020-1913
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.