# CVE-2018-16982: Open Chinese Convert out-of-bounds read denial of service

Source: https://junglewise.ai/threats/cve-2018-16982-open-chinese-convert-out-of-bounds-read-denial-of-service  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-05-14. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2018-16982 · Severity: low · CVSS 3 · Published 2022-05-14

Open Chinese Convert (OpenCC) is a library used to convert between Traditional and Simplified Chinese characters. A flaw in how it reads dictionary files (.ocd format) allows attackers to craft a malicious file that causes the application to crash, disrupting any service that depends on this library for language conversion functionality.

Technologies: [opencc (npm)](https://junglewise.ai/threats/technologies/opencc). Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2018-16982 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2018-16982 being exploited in the wild.

**How severe is CVE-2018-16982?** Low severity, with a CVSS score of 3, published 14 May 2022.

**Which products and versions are affected?** opencc (npm) SEMVER:introduced=0,fixed=1.1.2.

**Is there a fix for CVE-2018-16982?** Yes. opencc (npm): upgrade to 1.1.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2018-16982 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2018-16982?** Check whether you run opencc (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- opencc (npm): upgrade to 1.1.2 or later

  ```sh
  npm install opencc@1.1.2
  ```


## Technical details

The vulnerability is an out-of-bounds read in BinaryDict::NewFromFile (BinaryDict.cpp) where keyOffset and valueOffset values parsed from a crafted .ocd file can be set to arbitrary values. This causes pointer dereferences to access invalid memory, resulting in a segmentation fault and denial of service. The attack requires only that an application processes a user-supplied or attacker-controlled .ocd dictionary file; no authentication or network access is required. The vulnerability affects OpenCC versions prior to 1.1.2, with patches available in the referenced pull requests.

## Affected products

- OpenCC OpenCC prior to 1.1.2

## Identifiers

- CVE-2018-16982
- GHSA-9qh2-6fxg-9m4g

## Timeline

- 2018-09-13: disclosed
- 2018: patched: Fixes available in PR #309 and #560

## References

- [https://github.com/BYVoid/OpenCC/issues/303](https://github.com/BYVoid/OpenCC/issues/303)

## Related threats

- [OpenCC out-of-bounds read in UTF-8 processing](https://junglewise.ai/threats/opencc-out-of-bounds-read-in-utf-8-processing-3c05795f)
- [BYVoid OpenCC out-of-bounds write in MaxMatchSegmentation](https://junglewise.ai/threats/cve-2025-15536-byvoid-opencc-out-of-bounds-write-in-maxmatchsegmentation)