Vulnerability-Lookup

OESA-2026-1212 (CVE-2025-15536)

Vulnerability from osv_openeuler – Published: 2026-01-23 11:10 – Updated: 2026-08-06 11:10 – Source website

Summary

opencc security update

Details

Opencc is for between Traditional Chinese and Simplified Chinese characters and phrases conversion library.

Security Fix(es):

A vulnerability was found in BYVoid OpenCC up to 1.1.9 and classified as critical. Using CWE to declare the problem leads to CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Impacted is confidentiality, integrity, and availability. The exploit is available at github.com. It is declared as proof-of-concept. Applying the patch 345c9a50ab07018f1b4439776bad78a0d40778ec is able to eliminate this problem. The bugfix is ready for download at github.com.(CVE-2025-15536)

Severity

5.3 (Medium)


                    
                      CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2025-15536	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "opencc-1.1.7-3.oe2403.aarch64.rpm",
          "opencc-debuginfo-1.1.7-3.oe2403.aarch64.rpm",
          "opencc-debugsource-1.1.7-3.oe2403.aarch64.rpm",
          "opencc-devel-1.1.7-3.oe2403.aarch64.rpm",
          "opencc-help-1.1.7-3.oe2403.aarch64.rpm"
        ],
        "src": [
          "opencc-1.1.7-3.oe2403.src.rpm"
        ],
        "x86_64": [
          "opencc-1.1.7-3.oe2403.x86_64.rpm",
          "opencc-debuginfo-1.1.7-3.oe2403.x86_64.rpm",
          "opencc-debugsource-1.1.7-3.oe2403.x86_64.rpm",
          "opencc-devel-1.1.7-3.oe2403.x86_64.rpm",
          "opencc-help-1.1.7-3.oe2403.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS",
        "name": "opencc",
        "purl": "pkg:rpm/openEuler/opencc\u0026distro=openEuler-24.03-LTS"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.1.7-3.oe2403"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "Opencc is for between Traditional Chinese and Simplified Chinese characters and phrases conversion library.\r\n\r\nSecurity Fix(es):\n\nA vulnerability was found in BYVoid OpenCC up to 1.1.9 and classified as critical. Using CWE to declare the problem leads to CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Impacted is confidentiality, integrity, and availability. The exploit is available at github.com. It is declared as proof-of-concept. Applying the patch 345c9a50ab07018f1b4439776bad78a0d40778ec is able to eliminate this problem. The bugfix is ready for download at github.com.(CVE-2025-15536)",
  "id": "OESA-2026-1212",
  "modified": "2026-08-06T11:10:14Z",
  "published": "2026-01-23T11:10:14Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1212"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-15536"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "opencc security update",
  "upstream": [
    "CVE-2025-15536"
  ]
}

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

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

4.8 (Medium)


                        
                          CVSS: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

5.3 (Medium)


                        
                          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

5.3 (Medium)


                        
                          CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-01-20 17:06 UTC

CWE

CWE-122 - Heap-based Buffer Overflow
CWE-119 - Memory Corruption

Assigner

VulDB mitre root

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

1 product

Vendor	Product	Version
BYVoid	OpenCC	Affected: 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

Credits

Oneafter (VulDB User)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-15536",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-20T17:06:49.316017Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-20T17:07:00.359Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/BYVoid/OpenCC/issues/997"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "OpenCC",
          "vendor": "BYVoid",
          "versions": [
            {
              "status": "affected",
              "version": "1.1.0"
            },
            {
              "status": "affected",
              "version": "1.1.1"
            },
            {
              "status": "affected",
              "version": "1.1.2"
            },
            {
              "status": "affected",
              "version": "1.1.3"
            },
            {
              "status": "affected",
              "version": "1.1.4"
            },
            {
              "status": "affected",
              "version": "1.1.5"
            },
            {
              "status": "affected",
              "version": "1.1.6"
            },
            {
              "status": "affected",
              "version": "1.1.7"
            },
            {
              "status": "affected",
              "version": "1.1.8"
            },
            {
              "status": "affected",
              "version": "1.1.9"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Oneafter (VulDB User)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "baseScore": 4.8,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS: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",
            "version": "4.0"
          }
        },
        {
          "cvssV3_1": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "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",
            "version": "3.1"
          }
        },
        {
          "cvssV3_0": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C",
            "version": "3.0"
          }
        },
        {
          "cvssV2_0": {
            "baseScore": 4.3,
            "vectorString": "AV:L/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:OF/RC:C",
            "version": "2.0"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-122",
              "description": "Heap-based Buffer Overflow",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-119",
              "description": "Memory Corruption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-23T08:37:24.565Z",
        "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
        "shortName": "VulDB"
      },
      "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"
}

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.

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.

Related by attack behaviour

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Action not permitted

OESA-2026-1212 (CVE-2025-15536)

CVE-2025-15536 (GCVE-0-2025-15536)

Tags

Sightings

Nomenclature

Related by attack behaviour