# CVE-2026-116620: Tencent RapidJSON out-of-bounds read in string stream parsing

Source: https://junglewise.ai/threats/cve-2026-116620-a-security-vulnerability-has-been-detected-in-tencent-rapidjson  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-27. Updated: 2026-10-27  
License: CC BY 4.0 with a link back

CVE-2026-116620 · Severity: high · CVSS 7.3 · Published 2026-10-27

RapidJSON is a widely-used open-source JSON parser library for C++. A flaw in its string parsing function allows a remote attacker to read memory beyond allocated bounds when processing a maliciously crafted JSON input, potentially exposing sensitive data from the application's memory.

Vendors: [Tencent](https://junglewise.ai/threats/vendors/tencent).

## Quick answers

**Is CVE-2026-116620 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-116620 being exploited in the wild.

**How severe is CVE-2026-116620?** High severity, with a CVSS score of 7.3, published 27 October 2026.

**Which products and versions are affected?** Tencent RapidJSON up to 1.1.0.

**Is there a fix for CVE-2026-116620?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-116620 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-116620?** Check whether you run Tencent RapidJSON 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.

## Technical details

An out-of-bounds read vulnerability exists in the GenericStringStream<UTF8<char>>::Take() function in include/rapidjson/stream.h. The vulnerability can be triggered remotely via a crafted JSON input without requiring authentication or user interaction. An attacker can read memory outside the intended buffer, potentially leaking sensitive information.

## Affected products

- Tencent RapidJSON up to 1.1.0

## Timeline

- 2026-10-27: disclosed

## References

- [https://github.com/Tencent/rapidjson/](https://github.com/Tencent/rapidjson/)
- [https://github.com/Tencent/rapidjson/issues/2401](https://github.com/Tencent/rapidjson/issues/2401)

## Related threats

- [Tencent RapidJSON out-of-bounds read in floating-point parsing](https://junglewise.ai/threats/cve-2026-124586-a-vulnerability-was-determined-in-tencent-rapidjson-1-1-0)