CVE-2025-15536 (GCVE-0-2025-15536)
Vulnerability from cvelistv5 – Published: 2026-01-18 09:02 – Updated: 2026-02-23 08:37 X_Open Source
VLAI
EPSS
VEX
Title
BYVoid OpenCC MaxMatchSegmentation.cpp MaxMatchSegmentation heap-based overflow
Summary
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.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-20 17:06 UTC
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.341708 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.341708 | signaturepermissions-required |
| https://vuldb.com/?submit.733347 | third-party-advisory |
| https://github.com/BYVoid/OpenCC/issues/997 | issue-tracking |
| https://github.com/BYVoid/OpenCC/pull/1005 | issue-tracking |
| https://github.com/oneafter/1222/blob/main/repro | exploit |
| https://github.com/BYVoid/OpenCC/commit/345c9a50a… | patch |
| https://github.com/BYVoid/OpenCC/ | product |
Impacted products
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},
"references": [
{
"name": "VDB-341708 | BYVoid OpenCC MaxMatchSegmentation.cpp MaxMatchSegmentation heap-based overflow",
"tags": [
"vdb-entry",
"technical-description"
],
"url": "https://vuldb.com/?id.341708"
},
{
"name": "VDB-341708 | CTI Indicators (IOB, IOC, IOA)",
"tags": [
"signature",
"permissions-required"
],
"url": "https://vuldb.com/?ctiid.341708"
},
{
"name": "Submit #733347 | BYVoid OpenCC ver.1.1.9 and master-branch Heap-based Buffer Overflow",
"tags": [
"third-party-advisory"
],
"url": "https://vuldb.com/?submit.733347"
},
{
"tags": [
"issue-tracking"
],
"url": "https://github.com/BYVoid/OpenCC/issues/997"
},
{
"tags": [
"issue-tracking"
],
"url": "https://github.com/BYVoid/OpenCC/pull/1005"
},
{
"tags": [
"exploit"
],
"url": "https://github.com/oneafter/1222/blob/main/repro"
},
{
"tags": [
"patch"
],
"url": "https://github.com/BYVoid/OpenCC/commit/345c9a50ab07018f1b4439776bad78a0d40778ec"
},
{
"tags": [
"product"
],
"url": "https://github.com/BYVoid/OpenCC/"
}
],
"tags": [
"x_open-source"
],
"timeline": [
{
"lang": "en",
"time": "2026-01-17T00:00:00.000Z",
"value": "Advisory disclosed"
},
{
"lang": "en",
"time": "2026-01-17T01:00:00.000Z",
"value": "VulDB entry created"
},
{
"lang": "en",
"time": "2026-02-07T00:23:11.000Z",
"value": "VulDB entry last update"
}
],
"title": "BYVoid OpenCC MaxMatchSegmentation.cpp MaxMatchSegmentation heap-based overflow"
}
},
"cveMetadata": {
"assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
"assignerShortName": "VulDB",
"cveId": "CVE-2025-15536",
"datePublished": "2026-01-18T09:02:12.026Z",
"dateReserved": "2026-01-17T16:27:11.665Z",
"dateUpdated": "2026-02-23T08:37:24.565Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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