PT-2026-3384 · Byvoid+2 · Byvoid Opencc+2

Oneafter · Published 2026-01-18 · Updated 2026-05-26 · CVE-2025-15536

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions BYVoid OpenCC versions through 1.1.9

Description A flaw exists in BYVoid OpenCC that could allow for local code execution. This issue stems from a heap-based buffer overflow within the opencc::MaxMatchSegmentation function located in the src/MaxMatchSegmentation.cpp file. The exploit for this issue has been publicly released.

Recommendations Deploy patch 345c9a50ab07018f1b4439776bad78a0d40778ec.

Exploit

Fix

Heap Based Buffer Overflow

Buffer Overflow

Memory Corruption

Weakness Enumeration

CWE-122

CWE-119

CWE-787

Related Identifiers

AZL-74768

AZL-74790

CVE-2025-15536

GHSA-5PR6-CRVP-2J9F

OESA-2026-1209

OESA-2026-1210

OESA-2026-1211

OESA-2026-1212

OESA-2026-1213

OPENSUSE-SU-2026:10102-1

OPENSUSE-SU-2026:20683-1

SUSE-SU-2026:21553-1

USN-7972-1

USN-7972-2

Affected Products

Byvoid Opencc

Linuxmint

Ubuntu

References · 37

• 🔥 https://github.com/BYVoid/OpenCC/issues/997 · Exploit
• 🔥 https://vuldb.com/?submit.733347 · Exploit
• 🔥 https://github.com/oneafter/1222/blob/main/repro · Exploit
• https://github.com/BYVoid/OpenCC/pull/1005 · Patch
• https://github.com/BYVoid/OpenCC/commit/345c9a50ab07018f1b4439776bad78a0d40778ec · Patch
• https://ubuntu.com/security/notices/USN-7972-2 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-15536 · Vendor Advisory
• https://osv.dev/vulnerability/USN-7972-2 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-15536 · Security Note
• https://ubuntu.com/security/notices/USN-7972-1 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-5pr6-crvp-2j9f · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2025-15536 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2026-1211 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-15536 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2026-1209 · Vendor Advisory