Medium 5.3Published Jan 18, 2026

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

Updated under an hour ago (Oct 26, 2026, 12:23 PM ET)

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It affects BYVoid OpenCC and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for BYVoid OpenCC

Exploited in the last 30 days

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.

CVSS: 5.3 MEDIUM (v3.1, CNA)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
Weakness (CWE): CWE-122, CWE-119
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulDB
NVD analysis: Modified
Record last updated: Feb 23, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

BYVoid OpenCC byvoid:opencc (from the name)	1.1.0; 1.1.1; 1.1.2; 1.1.3; 1.1.4; 1.1.5; 1.1.6; 1.1.7; and 2 more ranges	CNA record
byvoid open_chinese_convert byvoid:open_chinese_convert	through 1.1.9	NVD

References

https://vuldb.com/?id.341708vdb-entry, technical-description, third-party-advisory
https://vuldb.com/?ctiid.341708signature, permissions-required, vdb-entry
https://vuldb.com/?submit.733347third-party-advisory, exploit, vdb-entry
https://github.com/BYVoid/OpenCC/issues/997issue-tracking, exploit, patch
https://github.com/BYVoid/OpenCC/pull/1005issue-tracking, patch
https://github.com/oneafter/1222/blob/main/reproexploit, product
https://github.com/BYVoid/OpenCC/commit/345c9a50ab07018f1b4439776bad78a0d40778ecpatch
https://github.com/BYVoid/OpenCC/product

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.