Log in Start free

Vulnerability · Published Jan 18, 2026 · Assigned by VulDB

CVE-2025-15536BYVoid OpenCC MaxMatchSegmentation.cpp MaxMatchSegmentation heap-based overflow

Medium 5.3

In plain English

A medium-severity heap buffer overflow in OpenCC from BYVoid. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.3%top 83.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

A weakness has been identified in BYVoid OpenCC up to 1.1.9. This vulnerability affects the function opencc::MaxMatchSegmentation of the file src/MaxMatchSegmentation.cpp. This manipulation causes heap-based buffer overflow. The attack is restricted to local execution. The exploit has been made available to the public and could be used for attacks. Patch name: 345c9a50ab07018f1b4439776bad78a0d40778ec. To fix this issue, it is recommended to deploy a patch.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.24opencc1.2.0-r0ALPINE-CVE-2025-15536
Debian:12openccno fix listedDEBIAN-CVE-2025-15536
Debian:13opencc1.1.9+ds1-1+deb13u1DEBIAN-CVE-2025-15536
Debian:14opencc1.1.9+ds1-4DEBIAN-CVE-2025-15536
Ubuntu:22.04:LTSopencc1.1.3+ds1-3ubuntu3.1USN-7972-1
Ubuntu:22.04:LTSopencc1.1.3+ds1-3ubuntu3.1UBUNTU-CVE-2025-15536
Ubuntu:24.04:LTSopencc1.1.7+ds1-1ubuntu0.1USN-7972-1
Ubuntu:24.04:LTSopencc1.1.7+ds1-1ubuntu0.1UBUNTU-CVE-2025-15536
Ubuntu:25.10opencc1.1.9+ds1-2ubuntu0.1USN-7972-1
Ubuntu:25.10opencc1.1.9+ds1-2ubuntu0.1UBUNTU-CVE-2025-15536
npmopencc1.2.0GHSA-5pr6-crvp-2j9f

Affected products (as reported)

VendorProductVersions
BYVoid OpenCC 1.1.01.1.11.1.21.1.31.1.41.1.51.1.61.1.7

Weakness: CWE-122, CWE-119 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C

References