CVE-2025-15536

opencc: OpenCC: Heap-based buffer overflow in MaxMatchSegmentation function allows local attackers to impact system integrity.

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Severity

Moderate

Red Hat Product Security

5.3

CVSS 3.1

Review impact separately from score.

Published · January 18, 2026

Updated · February 23, 2026

Description

A flaw was found in BYVoid OpenCC. This vulnerability involves a heap-based buffer overflow, a type of memory corruption, within the MaxMatchSegmentation function. A local attacker can exploit this by providing specially crafted input, which may lead to information disclosure, denial of service, or potentially arbitrary code execution. An exploit for this issue is publicly available.

Statement

Exploiting this vulnerability requires that the system allows untrusted input from local users.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.3
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

CWE-787 · Out-of-bounds Write