Vulnerability-Lookup

CNVD-2026-31553

Vulnerability from cnvd - Published: 2026-08-12

Title

Microsoft Excel堆缓冲区溢出漏洞（CNVD-2026-31553）

Description

Microsoft Excel是Microsoft Office套件中的电子表格处理组件，主要用于数据计算、分析和可视化。 Microsoft Excel存在堆缓冲区溢出漏洞，该漏洞源于未能正确处理特定数据导致堆内存写入越界，攻击者可利用该漏洞在本地执行任意代码。

Severity

高

Patch Name

Microsoft Excel堆缓冲区溢出漏洞（CNVD-2026-31553）的补丁

Patch Description

Microsoft Excel是Microsoft Office套件中的电子表格处理组件，主要用于数据计算、分析和可视化。 Microsoft Excel存在堆缓冲区溢出漏洞，该漏洞源于未能正确处理特定数据导致堆内存写入越界，攻击者可利用该漏洞在本地执行任意代码。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

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-2026-55029

Reference

https://nvd.nist.gov/vuln/detail/CVE-2026-55029

Impacted products

Name
['Microsoft Office Online Server', 'Microsoft Microsoft 365 Apps for Enterprise', 'Microsoft Microsoft Office LTSC 2021', 'Microsoft Microsoft Office 2019', 'Microsoft Microsoft Office LTSC for Mac 2021', 'Microsoft Microsoft Excel 2016', '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-2026-55029",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-55029"
    }
  },
  "description": "Microsoft Excel\u662fMicrosoft Office\u5957\u4ef6\u4e2d\u7684\u7535\u5b50\u8868\u683c\u5904\u7406\u7ec4\u4ef6\uff0c\u4e3b\u8981\u7528\u4e8e\u6570\u636e\u8ba1\u7b97\u3001\u5206\u6790\u548c\u53ef\u89c6\u5316\u3002\n\nMicrosoft Excel\u5b58\u5728\u5806\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u672a\u80fd\u6b63\u786e\u5904\u7406\u7279\u5b9a\u6570\u636e\u5bfc\u81f4\u5806\u5185\u5b58\u5199\u5165\u8d8a\u754c\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\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-2026-55029",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-31553",
  "openTime": "2026-08-12",
  "patchDescription": "Microsoft Excel\u662fMicrosoft Office\u5957\u4ef6\u4e2d\u7684\u7535\u5b50\u8868\u683c\u5904\u7406\u7ec4\u4ef6\uff0c\u4e3b\u8981\u7528\u4e8e\u6570\u636e\u8ba1\u7b97\u3001\u5206\u6790\u548c\u53ef\u89c6\u5316\u3002\r\n\r\nMicrosoft Excel\u5b58\u5728\u5806\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u672a\u80fd\u6b63\u786e\u5904\u7406\u7279\u5b9a\u6570\u636e\u5bfc\u81f4\u5806\u5185\u5b58\u5199\u5165\u8d8a\u754c\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\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 Excel\u5806\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2026-31553\uff09\u7684\u8865\u4e01",
  "products": {
    "product": [
      "Microsoft Office Online Server",
      "Microsoft Microsoft 365 Apps for Enterprise",
      "Microsoft Microsoft Office LTSC 2021",
      "Microsoft Microsoft Office 2019",
      "Microsoft Microsoft Office LTSC for Mac 2021",
      "Microsoft Microsoft Excel 2016",
      "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-2026-55029",
  "serverity": "\u9ad8",
  "submitTime": "2026-07-15",
  "title": "Microsoft Excel\u5806\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2026-31553\uff09"
}

CVE-2026-55029 (GCVE-0-2026-55029)

Vulnerability from cvelistv5 – Published: 2026-07-14 17:08 – Updated: 2026-08-20 17:04

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 · CISA-ADP (v2.0.3)

Decision recorded 2026-07-10 00:00 UTC

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

microsoft mitre root

References

1 reference

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

Impacted products

9 products

Vendor	Product	Version
Microsoft	Microsoft 365 Apps for Enterprise	Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Excel 2016	Affected: 16.0.0.0 , < 16.0.5561.1001 (custom)
Microsoft	Microsoft Office 2019	Affected: 19.0.0 , < 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)
Microsoft	Office Online Server	Affected: 16.0.0.0 , < 16.0.10417.20175 (custom)

Date Public

2026-07-14 14:00

Show details on NVD website

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{
  "containers": {
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      {
        "metrics": [
          {
            "other": {
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                "id": "CVE-2026-55029",
                "options": [
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                  },
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                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-10T00:00:00+00:00",
                "version": "2.0.3"
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        "providerMetadata": {
          "dateUpdated": "2026-07-15T03:56:20.664Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
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          "product": "Microsoft Office LTSC 2024",
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          "versions": [
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              "version": "16.0.0",
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              "version": "16.0.0.0",
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      "cpeApplicability": [
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        }
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    "datePublished": "2026-07-14T17:08:41.617Z",
    "dateReserved": "2026-06-16T14:12:44.285Z",
    "dateUpdated": "2026-08-20T17:04:59.440Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}

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.
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.

Action not permitted

CNVD-2026-31553

CVE-2026-55029 (GCVE-0-2026-55029)

Tags

Sightings

Nomenclature