Vulnerability-Lookup

CNVD-2026-29405

Vulnerability from cnvd - Published: 2026-07-31

Title

Microsoft Office Excel堆缓冲区溢出漏洞（CNVD-2026-29405）

Description

Microsoft Office Excel是Microsoft Office套件中的电子表格处理软件，主要提供数据计算、图表分析和表格管理等功能。 Microsoft Office Excel存在堆缓冲区溢出漏洞，该漏洞产生的原因是程序未能正确验证数据边界导致堆内存写入越界，攻击者可利用该漏洞通过构造特制文件在本地执行任意代码。

Severity

高

Patch Name

Microsoft Office Excel堆缓冲区溢出漏洞（CNVD-2026-29405）的补丁

Patch Description

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56156

Reference

https://nvd.nist.gov/vuln/detail/CVE-2026-56156

Impacted products

Name
['Microsoft Microsoft 365 Apps for Enterprise', 'Microsoft Microsoft Office LTSC 2021', 'Microsoft Microsoft Office LTSC for Mac 2021', 'Microsoft Microsoft Office LTSC 2024', 'Microsoft Microsoft Office LTSC for Mac 2024', 'Microsoft Microsoft Office 365 for Mac']

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-56156",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-56156"
    }
  },
  "description": "Microsoft Office Excel\u662fMicrosoft Office\u5957\u4ef6\u4e2d\u7684\u7535\u5b50\u8868\u683c\u5904\u7406\u8f6f\u4ef6\uff0c\u4e3b\u8981\u63d0\u4f9b\u6570\u636e\u8ba1\u7b97\u3001\u56fe\u8868\u5206\u6790\u548c\u8868\u683c\u7ba1\u7406\u7b49\u529f\u80fd\u3002\n\nMicrosoft Office Excel\u5b58\u5728\u5806\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u4ea7\u751f\u7684\u539f\u56e0\u662f\u7a0b\u5e8f\u672a\u80fd\u6b63\u786e\u9a8c\u8bc1\u6570\u636e\u8fb9\u754c\u5bfc\u81f4\u5806\u5185\u5b58\u5199\u5165\u8d8a\u754c\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u6784\u9020\u7279\u5236\u6587\u4ef6\u5728\u672c\u5730\u6267\u884c\u4efb\u610f\u4ee3\u7801\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56156",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-29405",
  "openTime": "2026-07-31",
  "patchDescription": "Microsoft Office Excel\u662fMicrosoft Office\u5957\u4ef6\u4e2d\u7684\u7535\u5b50\u8868\u683c\u5904\u7406\u8f6f\u4ef6\uff0c\u4e3b\u8981\u63d0\u4f9b\u6570\u636e\u8ba1\u7b97\u3001\u56fe\u8868\u5206\u6790\u548c\u8868\u683c\u7ba1\u7406\u7b49\u529f\u80fd\u3002\r\n\r\nMicrosoft Office Excel\u5b58\u5728\u5806\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u4ea7\u751f\u7684\u539f\u56e0\u662f\u7a0b\u5e8f\u672a\u80fd\u6b63\u786e\u9a8c\u8bc1\u6570\u636e\u8fb9\u754c\u5bfc\u81f4\u5806\u5185\u5b58\u5199\u5165\u8d8a\u754c\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u6784\u9020\u7279\u5236\u6587\u4ef6\u5728\u672c\u5730\u6267\u884c\u4efb\u610f\u4ee3\u7801\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "Microsoft Office Excel\u5806\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2026-29405\uff09\u7684\u8865\u4e01",
  "products": {
    "product": [
      "Microsoft Microsoft 365 Apps for Enterprise",
      "Microsoft Microsoft Office LTSC 2021",
      "Microsoft Microsoft Office LTSC for Mac 2021",
      "Microsoft Microsoft Office LTSC 2024",
      "Microsoft Microsoft Office LTSC for Mac 2024",
      "Microsoft Microsoft Office 365 for Mac"
    ]
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2026-56156",
  "serverity": "\u9ad8",
  "submitTime": "2026-07-15",
  "title": "Microsoft Office Excel\u5806\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2026-29405\uff09"
}

CVE-2026-56156 (GCVE-0-2026-56156)

Vulnerability from cvelistv5 – Published: 2026-07-14 17:09 – Updated: 2026-08-03 22:57

Title

Microsoft Excel Remote Code Execution Vulnerability

Summary

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

microsoft

References

1 reference

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerabi…	vendor-advisorypatch

Impacted products

6 products

Vendor	Product	Version
Microsoft	Microsoft 365 Apps for Enterprise	Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office 365 for Mac	Affected: 1.0.0 , < 16.111.26071215 (custom)
Microsoft	Microsoft Office LTSC 2021	Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office LTSC 2024	Affected: 16.0.0 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office LTSC for Mac 2021	Affected: 16.0.1 , < 16.111.26071215 (custom)
Microsoft	Microsoft Office LTSC for Mac 2024	Affected: 16.0.0 , < 16.111.26071215 (custom)

Date Public

2026-07-14 14:00

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-56156",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-10T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-15T03:56:07.620Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
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            "x64-based Systems"
          ],
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            }
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          ]
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      ],
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        "shortName": "microsoft"
      },
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          "name": "Microsoft Excel Remote Code Execution Vulnerability",
          "tags": [
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        }
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      "title": "Microsoft Excel Remote Code Execution Vulnerability"
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    "datePublished": "2026-07-14T17:09:12.669Z",
    "dateReserved": "2026-06-19T13:53:31.988Z",
    "dateUpdated": "2026-08-03T22:57:32.415Z",
    "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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

CNVD-2026-29405

CVE-2026-56156 (GCVE-0-2026-56156)

Tags

Sightings

Nomenclature