Vulnerability-Lookup

CNVD-2026-26373

Vulnerability from cnvd - Published: 2026-07-03

Title

OpenBSD src mpls_do_error函数越界读取漏洞

Description

OpenBSD src是一款用于构建OpenBSD操作系统的基础源代码包，包含内核及核心组件的实现。 OpenBSD src存在越界读取漏洞。该漏洞源于mpls_do_error函数未能正确处理包含16个标签且未设置栈底位的特制MPLS帧，攻击者可利用该漏洞泄露内核栈内存。

Severity

中

Patch Name

OpenBSD src mpls_do_error函数越界读取漏洞的补丁

Patch Description

OpenBSD src是一款用于构建OpenBSD操作系统的基础源代码包，包含内核及核心组件的实现。 OpenBSD src存在越界读取漏洞。该漏洞源于mpls_do_error函数未能正确处理包含16个标签且未设置栈底位的特制MPLS帧，攻击者可利用该漏洞泄露内核栈内存。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://github.com/openbsd/src/commit/6a23123ec05f1eb29cfcaae0f3a468b2e1983cfd

Reference

https://pop.argus-systems.ai/advisory/adv-040.html

Impacted products

Name
OpenBSD OpenBSD <2026-06-18

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-56099",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-56099"
    }
  },
  "description": "OpenBSD src\u662f\u4e00\u6b3e\u7528\u4e8e\u6784\u5efaOpenBSD\u64cd\u4f5c\u7cfb\u7edf\u7684\u57fa\u7840\u6e90\u4ee3\u7801\u5305\uff0c\u5305\u542b\u5185\u6838\u53ca\u6838\u5fc3\u7ec4\u4ef6\u7684\u5b9e\u73b0\u3002\n\nOpenBSD src\u5b58\u5728\u8d8a\u754c\u8bfb\u53d6\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8empls_do_error\u51fd\u6570\u672a\u80fd\u6b63\u786e\u5904\u7406\u5305\u542b16\u4e2a\u6807\u7b7e\u4e14\u672a\u8bbe\u7f6e\u6808\u5e95\u4f4d\u7684\u7279\u5236MPLS\u5e27\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u6cc4\u9732\u5185\u6838\u6808\u5185\u5b58\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://github.com/openbsd/src/commit/6a23123ec05f1eb29cfcaae0f3a468b2e1983cfd",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-26373",
  "openTime": "2026-07-03",
  "patchDescription": "OpenBSD src\u662f\u4e00\u6b3e\u7528\u4e8e\u6784\u5efaOpenBSD\u64cd\u4f5c\u7cfb\u7edf\u7684\u57fa\u7840\u6e90\u4ee3\u7801\u5305\uff0c\u5305\u542b\u5185\u6838\u53ca\u6838\u5fc3\u7ec4\u4ef6\u7684\u5b9e\u73b0\u3002\r\n\r\nOpenBSD src\u5b58\u5728\u8d8a\u754c\u8bfb\u53d6\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8empls_do_error\u51fd\u6570\u672a\u80fd\u6b63\u786e\u5904\u7406\u5305\u542b16\u4e2a\u6807\u7b7e\u4e14\u672a\u8bbe\u7f6e\u6808\u5e95\u4f4d\u7684\u7279\u5236MPLS\u5e27\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u6cc4\u9732\u5185\u6838\u6808\u5185\u5b58\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": "OpenBSD src mpls_do_error\u51fd\u6570\u8d8a\u754c\u8bfb\u53d6\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "OpenBSD OpenBSD \u003c2026-06-18"
  },
  "referenceLink": "https://pop.argus-systems.ai/advisory/adv-040.html",
  "serverity": "\u4e2d",
  "submitTime": "2026-06-22",
  "title": "OpenBSD src mpls_do_error\u51fd\u6570\u8d8a\u754c\u8bfb\u53d6\u6f0f\u6d1e"
}

CVE-2026-56099 (GCVE-0-2026-56099)

Vulnerability from cvelistv5 – Published: 2026-06-18 19:29 – Updated: 2026-07-14 21:33 X_Open Source

Title

OpenBSD mpls_do_error Kernel Stack Memory Disclosure via MPLS Input

Summary

OpenBSD before commit 6a23123 (2026-06-18) contains an out-of-bounds read vulnerability in the mpls_do_error function within sys/netmpls/mpls_input.c that allows remote attackers to disclose kernel stack memory by sending crafted MPLS frames with 16 labels and no Bottom-of-Stack bit set.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-23 20:44 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

VulnCheck mitre root

References

5 references

URL	Tags
https://pop.argus-systems.ai/advisory/adv-040.html	technical-descriptionexploit
https://github.com/openbsd/src/commit/6a23123ec05…	patch
https://www.vulncheck.com/advisories/openbsd-mpls…	third-party-advisory
http://www.openwall.com/lists/oss-security/2026/06/19/3
http://seclists.org/fulldisclosure/2026/Jun/17

Impacted products

1 product

Vendor	Product	Version
openbsd	src	Affected: 0 , < 6a23123ec05f1eb29cfcaae0f3a468b2e1983cfd (git)

Date Public

2026-06-18 00:00

Credits

Argus Systems

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-06-21T07:37:24.961Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/06/19/3"
          },
          {
            "url": "http://seclists.org/fulldisclosure/2026/Jun/17"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-56099",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-23T20:44:12.654787Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-23T20:44:20.494Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "affected",
          "packageURL": "pkg:github/openbsd/src",
          "product": "src",
          "repo": "https://github.com/openbsd/src",
          "vendor": "openbsd",
          "versions": [
            {
              "lessThan": "6a23123ec05f1eb29cfcaae0f3a468b2e1983cfd",
              "status": "affected",
              "version": "0",
              "versionType": "git"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Argus Systems"
        }
      ],
      "datePublic": "2026-06-18T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "OpenBSD before commit 6a23123 (2026-06-18) contains an out-of-bounds read vulnerability in the mpls_do_error function within sys/netmpls/mpls_input.c that allows remote attackers to disclose kernel stack memory by sending crafted MPLS frames with 16 labels and no Bottom-of-Stack bit set."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
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        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
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          ]
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      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-14T21:33:59.892Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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      "references": [
        {
          "tags": [
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          "url": "https://pop.argus-systems.ai/advisory/adv-040.html"
        },
        {
          "tags": [
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          ],
          "url": "https://github.com/openbsd/src/commit/6a23123ec05f1eb29cfcaae0f3a468b2e1983cfd"
        },
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/openbsd-mpls-do-error-kernel-stack-memory-disclosure-via-mpls-input"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "tags": [
        "x_open-source"
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      "title": "OpenBSD mpls_do_error Kernel Stack Memory Disclosure via MPLS Input",
      "x_generator": {
        "engine": "vulncheck"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-56099",
    "datePublished": "2026-06-18T19:29:08.271Z",
    "dateReserved": "2026-06-18T19:15:10.649Z",
    "dateUpdated": "2026-07-14T21:33:59.892Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.
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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.
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CNVD-2026-26373

CVE-2026-56099 (GCVE-0-2026-56099)

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Nomenclature

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