What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-01-18 · updated 2026-06-17
• Weakness: CWE-119

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 products

• BYVoid Open Chinese Convert: through 1.1.9

References

• https://github.com/BYVoid/OpenCC/
• https://github.com/BYVoid/OpenCC/commit/345c9a50ab07018f1b4439776bad78a0d40778ec
• https://github.com/BYVoid/OpenCC/issues/997
• https://github.com/BYVoid/OpenCC/pull/1005
• https://github.com/oneafter/1222/blob/main/repro
• https://vuldb.com/?ctiid.341708
• https://vuldb.com/?id.341708
• https://vuldb.com/?submit.733347
• https://github.com/BYVoid/OpenCC/issues/997

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