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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.

PUBLISHED Reserved 2026-01-17 | Published 2026-01-18 | Updated 2026-02-23 | Assigner VulDB




MEDIUM: 4.8CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
MEDIUM: 5.3CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
MEDIUM: 5.3CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
4.3AV:L/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:OF/RC:C

Problem types

Heap-based Buffer Overflow

Memory Corruption

Product status

1.1.0
affected

1.1.1
affected

1.1.2
affected

1.1.3
affected

1.1.4
affected

1.1.5
affected

1.1.6
affected

1.1.7
affected

1.1.8
affected

1.1.9
affected

Timeline

2026-01-17:Advisory disclosed
2026-01-17:VulDB entry created
2026-02-07:VulDB entry last update

Credits

Oneafter (VulDB User) reporter

References

github.com/BYVoid/OpenCC/issues/997 exploit

vuldb.com/?id.341708 (VDB-341708 | BYVoid OpenCC MaxMatchSegmentation.cpp MaxMatchSegmentation heap-based overflow) vdb-entry technical-description

vuldb.com/?ctiid.341708 (VDB-341708 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/?submit.733347 (Submit #733347 | BYVoid OpenCC ver.1.1.9 and master-branch Heap-based Buffer Overflow) third-party-advisory

github.com/BYVoid/OpenCC/issues/997 issue-tracking

github.com/BYVoid/OpenCC/pull/1005 issue-tracking

github.com/oneafter/1222/blob/main/repro exploit

github.com/...ommit/345c9a50ab07018f1b4439776bad78a0d40778ec patch

github.com/BYVoid/OpenCC/ product

cve.org (CVE-2025-15536)

nvd.nist.gov (CVE-2025-15536)

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