Buffer overflow in Tencent Rapidjson
CVE-2026-124586
A vulnerability was determined in Tencent RapidJSON 1.1.0. Impacted is the function GetCachedPowerByIndex in the library include/rapidjson/internal/diyfp.h. This manipulation of the argument decimalPosition causes out-of-bounds read. It is possible to initiate the attack remotely. The exploit has been publicly disclosed and may be utilized. The project was informed of the problem early through an issue report but has not responded yet.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Tencent Rapidjson — versions 1.1.0
Weakness classification (CWE)
References
- vuldb.com/vuln/433010 (technical-description, vdb-entry)
- vuldb.com/vuln/433010/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-124586 (third-party-advisory)
- vuldb.com/submit/1039172 (third-party-advisory)
- github.com/Tencent/rapidjson/issues/2405 (issue-tracking, exploit)
- github.com/Tencent/rapidjson/ (product)
Frequently asked questions
- What is CVE-2026-124586?
- CVE-2026-124586 is a high-severity vulnerability in Tencent Rapidjson, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.3/10. Published 2026-11-09.
- How severe is CVE-2026-124586?
- High severity. CVSS v3 base score is 7.3 out of 10.