CVE-2020-1912 json
Out-of-bounds Read and Out-of-bounds Write in Facebook Hermes
published 2020-09-09 6 y ago modified 2026-06-17 4 mo ago also GHSA-pf27-929j-9pmm , EUVD-2022-4748
- cvss
- 8.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.8%
- EPSS 1.8% chance of exploitation in 30 days, percentile 78%
- public exploits
- 0
- none known
Summary
An out-of-bounds read/write vulnerability when executing lazily compiled inner generator functions in Facebook Hermes prior to commit 091835377369c8fd5917d9b87acffa721ad2a168 allows attackers to potentially execute arbitrary code 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
1.81% chance of exploitation in the next 30 days, higher than 78% 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/091835377369c8fd5917d9b87acffa721ad2a168
web, patch, third-party-advisory
-
facebook.com
/security/advisories/cve-2020-1912
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2020-1912
advisory
Sources
- CVE List CVE-2020-1912
- GitHub Advisory GHSA-pf27-929j-9pmm
- NVD CVE-2020-1912
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