Vulnerability-Lookup

CNVD-2026-26533

Vulnerability from cnvd - Published: 2026-07-07

Title

OpenBSD拒绝服务漏洞（CNVD-2026-26533）

Description

OpenBSD是加拿大OpenBSD组织的一套跨平台的、基于BSD的类UNIX操作系统。 OpenBSD存在安全漏洞，该漏洞源于httpd(8)在处理格式错误的fastcgi请求时出现NULL解引用。攻击者可利用此漏洞导致拒绝服务。

Severity

高

Patch Name

OpenBSD拒绝服务漏洞（CNVD-2026-26533）的补丁

Patch Description

OpenBSD是加拿大OpenBSD组织的一套跨平台的、基于BSD的类UNIX操作系统。 OpenBSD存在安全漏洞，该漏洞源于httpd(8)在处理格式错误的fastcgi请求时出现NULL解引用。攻击者可利用此漏洞导致拒绝服务。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://ftp.openbsd.org/pub/OpenBSD/patches/

Reference

https://ftp.openbsd.org/pub/OpenBSD/patches/7.3/common/020_

Impacted products

Name
['Openbsd OpenBSD <7.4 errata 006', 'Openbsd OpenBSD <7.3 errata 020']

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2024-11148",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2024-11148"
    }
  },
  "description": "OpenBSD\u662f\u52a0\u62ff\u5927OpenBSD\u7ec4\u7ec7\u7684\u4e00\u5957\u8de8\u5e73\u53f0\u7684\u3001\u57fa\u4e8eBSD\u7684\u7c7bUNIX\u64cd\u4f5c\u7cfb\u7edf\u3002\n\nOpenBSD\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8ehttpd(8)\u5728\u5904\u7406\u683c\u5f0f\u9519\u8bef\u7684fastcgi\u8bf7\u6c42\u65f6\u51fa\u73b0NULL\u89e3\u5f15\u7528\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u6b64\u6f0f\u6d1e\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\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://ftp.openbsd.org/pub/OpenBSD/patches/",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-26533",
  "openTime": "2026-07-07",
  "patchDescription": "OpenBSD\u662f\u52a0\u62ff\u5927OpenBSD\u7ec4\u7ec7\u7684\u4e00\u5957\u8de8\u5e73\u53f0\u7684\u3001\u57fa\u4e8eBSD\u7684\u7c7bUNIX\u64cd\u4f5c\u7cfb\u7edf\u3002\r\n\r\nOpenBSD\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8ehttpd(8)\u5728\u5904\u7406\u683c\u5f0f\u9519\u8bef\u7684fastcgi\u8bf7\u6c42\u65f6\u51fa\u73b0NULL\u89e3\u5f15\u7528\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u6b64\u6f0f\u6d1e\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\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\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff08CNVD-2026-26533\uff09\u7684\u8865\u4e01",
  "products": {
    "product": [
      "Openbsd OpenBSD \u003c7.4 errata 006",
      "Openbsd OpenBSD \u003c7.3 errata 020"
    ]
  },
  "referenceLink": "https://ftp.openbsd.org/pub/OpenBSD/patches/7.3/common/020_",
  "serverity": "\u9ad8",
  "submitTime": "2024-12-13",
  "title": "OpenBSD\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff08CNVD-2026-26533\uff09"
}

CVE-2024-11148 (GCVE-0-2024-11148)

Vulnerability from cvelistv5 – Published: 2024-12-05 19:50 – Updated: 2024-12-06 18:58

Title

OpenBSD httpd(8) null dereference

Summary

In OpenBSD 7.4 before errata 006 and OpenBSD 7.3 before errata 020, httpd(8) is vulnerable to a NULL dereference when handling a malformed fastcgi request.

Severity

7.5 (High)


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

8.7 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-12-06 18:57 UTC

CWE

CWE-476 - NULL Pointer Dereference

Assigner

cisa-cg CISA root

References

2 references

URL	Tags
https://ftp.openbsd.org/pub/OpenBSD/patches/7.4/c…
https://ftp.openbsd.org/pub/OpenBSD/patches/7.3/c…

Impacted products

2 products

Vendor	Product	Version
OpenBSD	OpenBSD	Affected: 7.4 , < 7.4 errata 006 (custom) Unaffected: 7.4 errata 006 Affected: 7.3 , < 7.3 errata 020 (custom) Unaffected: 7.3 errata 020
openbsd	openbsd	Affected: 7.4_errata006 Affected: 7.3_errata020 cpe:2.3:a:openbsd:openbsd:-:::::::*

Date Public

2023-11-21 00:00

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:a:openbsd:openbsd:-:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "openbsd",
            "vendor": "openbsd",
            "versions": [
              {
                "status": "affected",
                "version": "7.4_errata006"
              },
              {
                "status": "affected",
                "version": "7.3_errata020"
              }
            ]
          }
        ],
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-11148",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-12-06T18:57:22.246744Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-12-06T18:58:45.147Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "affected",
          "product": "OpenBSD",
          "vendor": "OpenBSD",
          "versions": [
            {
              "lessThan": "7.4 errata 006",
              "status": "affected",
              "version": "7.4",
              "versionType": "custom"
            },
            {
              "status": "unaffected",
              "version": "7.4 errata 006"
            },
            {
              "lessThan": "7.3 errata 020",
              "status": "affected",
              "version": "7.3",
              "versionType": "custom"
            },
            {
              "status": "unaffected",
              "version": "7.3 errata 020"
            }
          ]
        }
      ],
      "datePublic": "2023-11-21T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "In OpenBSD 7.4 before errata 006 and OpenBSD 7.3 before errata 020, httpd(8) is vulnerable to a NULL dereference when handling a malformed fastcgi request."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "format": "CVSS"
        },
        {
          "cvssV4_0": {
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/AU:Y",
            "version": "4.0"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-476",
              "description": "CWE-476 NULL Pointer Dereference",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-12-05T19:50:19.954Z",
        "orgId": "9119a7d8-5eab-497f-8521-727c672e3725",
        "shortName": "cisa-cg"
      },
      "references": [
        {
          "name": "url",
          "url": "https://ftp.openbsd.org/pub/OpenBSD/patches/7.4/common/006_httpd.patch.sig"
        },
        {
          "name": "url",
          "url": "https://ftp.openbsd.org/pub/OpenBSD/patches/7.3/common/020_httpd.patch.sig"
        }
      ],
      "title": "OpenBSD httpd(8) null dereference"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9119a7d8-5eab-497f-8521-727c672e3725",
    "assignerShortName": "cisa-cg",
    "cveId": "CVE-2024-11148",
    "datePublished": "2024-12-05T19:50:19.954Z",
    "dateReserved": "2024-11-12T15:39:23.020Z",
    "dateUpdated": "2024-12-06T18:58:45.147Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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

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.

Action not permitted

CNVD-2026-26533

CVE-2024-11148 (GCVE-0-2024-11148)

Tags

Sightings

Nomenclature

Related by attack behaviour