Out-of-bounds Read Vulnerability in Tencent RapidJSON Library
CVE-2026-124586

6.9MEDIUM

Key Information:

Vendor

Tencent

Status
Rapidjson
Vendor
CVE Published:
9 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-124586?

A vulnerability in Tencent RapidJSON 1.1.0 exists within the GetCachedPowerByIndex function in the diyfp.h file, allowing for out-of-bounds reads due to improper handling of the decimalPosition argument. This flaw can be exploited remotely, raising concerns for users who implement this library in their applications. Despite an early notification to Tencent through an issue report, no remedial action has been undertaken as of now, making it crucial for users to be aware of this risk and take necessary precautions.

Affected Version(s)

RapidJSON 1.1.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-124586 - Proof of Concept

References

https://vuldb.com/vuln/433010
vdb-entrytechnical-description
https://vuldb.com/vuln/433010/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-124586
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

shuidajiao (VulDB User)
VulDB CNA Team
.