NCSC-2026-0134

Vulnerability from csaf_ncscnl - Published: 2026-05-06 11:33 - Updated: 2026-05-06 11:33
Summary
Kwetsbaarheden verholpen in Apache HTTP Server
Notes
The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions: NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein. NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory. This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings.
Feiten: Apache Software Foundation heeft meerdere kwetsbaarheden verholpen in Apache HTTP Server.
Interpretaties: De kwetsbaarheden betreffen verschillende modules en functionaliteiten binnen Apache HTTP Server. De meest ernstige kwetsbaarheid betreft een double free in de HTTP/2-implementatie, die het voor een aanvaller mogelijk maakt om willekeurige code uit te voeren voorafgaand aan authenticatie. Lokale .htaccess auteurs kunnen via een privilege-escalatie toegang krijgen tot bestanden met httpd-gebruikersrechten. Het mod_proxy_ajp module bevat een heap-based buffer overflow en een out-of-bounds read, waardoor geheugenbeschadiging kan optreden. In de mod_md module is een resource allocatieprobleem aanwezig dat de serverprestaties kan beïnvloeden. De mod_dav_lock module bevat een NULL pointer dereference die kan leiden tot servercrashes en daarmee denial of service. De mod_auth_digest module kent een timing attack die Digest authenticatie kan omzeilen. De mod_authn_socache module heeft een NULL pointer dereference die crashes veroorzaakt bij caching forward proxy configuraties. Verder is er een HTTP response splitting kwetsbaarheid die manipulatie van HTTP headers mogelijk maakt. Daarnaast is er een improper null termination en out-of-bounds read in de core server functionaliteit, en een buffer over-read die kan leiden tot informatielekken of instabiliteit.
Oplossingen: Apache Software Foundation heeft versie 2.4.67 uitgebracht waarin alle genoemde kwetsbaarheden zijn verholpen. Zie bijgevoegde referenties voor meer informatie.
Kans: medium
Schade: high
CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-122: Heap-based Buffer Overflow
CWE-125: Out-of-bounds Read
CWE-126: Buffer Over-read
CWE-170: Improper Null Termination
CWE-208: Observable Timing Discrepancy
CWE-269: Improper Privilege Management
CWE-415: Double Free
CWE-443: DEPRECATED: HTTP response splitting
CWE-476: NULL Pointer Dereference
CWE-770: Allocation of Resources Without Limits or Throttling
CWE-1341: Multiple Releases of Same Resource or Handle
CVE-2026-23918

Apache HTTP Server 2.4.66 contains a critical double free vulnerability in its HTTP/2 implementation that enables remote code execution, fixed in version 2.4.67.

8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-415 - Double Free
CVE-2026-24072

An escalation of privilege vulnerability in Apache HTTP Server versions 2.4.66 and earlier allows local .htaccess authors to access files with httpd user privileges, resolved in version 2.4.67.

8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVE-2026-28780

A heap-based buffer overflow in Apache HTTP Server mod_proxy_ajp module allows a malicious AJP server to corrupt memory by writing beyond the buffer, affecting versions up to 2.4.66 and fixed in 2.4.67.

CWE-122 - Heap-based Buffer Overflow
CVE-2026-29168

Apache HTTP Server versions 2.4.30 through 2.4.66 contain a resource allocation vulnerability in the mod_md module related to OCSP response data, resolved in version 2.4.67.

7.3 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CWE-770 - Allocation of Resources Without Limits or Throttling
CVE-2026-29169

A NULL pointer dereference vulnerability in mod_dav_lock of Apache HTTP Server 2.4.66 and earlier can cause server crashes, affecting versions up to 2.4.66.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-476 - NULL Pointer Dereference
CVE-2026-33006

A timing attack vulnerability in Apache HTTP Server 2.4.66's mod_auth_digest module allows remote attackers to bypass Digest authentication, fixed in version 2.4.67.

4.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CWE-208 - Observable Timing Discrepancy
CVE-2026-33007

A NULL pointer dereference vulnerability in mod_authn_socache of Apache HTTP Server 2.4.66 and earlier allows unauthenticated remote users to crash child processes in caching forward proxy setups, fixed in version 2.4.67.

5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE-476 - NULL Pointer Dereference
CVE-2026-33523

An HTTP response splitting vulnerability exists in multiple Apache HTTP Server modules up to version 2.4.66, which is resolved in version 2.4.67.

6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVE-2026-33857

An out-of-bounds read vulnerability exists in the mod_proxy_ajp module of Apache HTTP Server versions up to 2.4.66, resolved in version 2.4.67.

5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE-125 - Out-of-bounds Read
CVE-2026-34032

Apache HTTP Server versions up to 2.4.66 contain an Improper Null Termination and Out-of-bounds Read vulnerability, which is addressed in version 2.4.67.

5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE-125 - Out-of-bounds Read
CVE-2026-34059

A buffer over-read vulnerability in Apache HTTP Server versions up to 2.4.66 has been addressed in version 2.4.67, requiring users to upgrade to resolve the issue.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE-126 - Buffer Over-read
References
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        "text": "Apache Software Foundation heeft meerdere kwetsbaarheden verholpen in Apache HTTP Server.",
        "title": "Feiten"
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          "text": "NULL Pointer Dereference",
          "title": "CWE-476"
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          "title": "Summary"
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      "title": "CVE-2026-29169"
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      "cwe": {
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        "name": "Observable Timing Discrepancy"
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        {
          "category": "other",
          "text": "Observable Timing Discrepancy",
          "title": "CWE-208"
        },
        {
          "category": "description",
          "text": "A timing attack vulnerability in Apache HTTP Server 2.4.66\u0027s mod_auth_digest module allows remote attackers to bypass Digest authentication, fixed in version 2.4.67.",
          "title": "Summary"
        },
        {
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          "text": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
          "title": "CVSSV4"
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          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-33006.json"
        }
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          "category": "description",
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          "title": "Summary"
        },
        {
          "category": "general",
          "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
          "title": "CVSSV4"
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          "summary": "CVE-2026-33007 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-33007.json"
        }
      ],
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            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "products": [
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    },
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          "title": "Summary"
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          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-33523.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1"
          ]
        }
      ],
      "title": "CVE-2026-33523"
    },
    {
      "cve": "CVE-2026-33857",
      "cwe": {
        "id": "CWE-125",
        "name": "Out-of-bounds Read"
      },
      "notes": [
        {
          "category": "other",
          "text": "Out-of-bounds Read",
          "title": "CWE-125"
        },
        {
          "category": "description",
          "text": "An out-of-bounds read vulnerability exists in the mod_proxy_ajp module of Apache HTTP Server versions up to 2.4.66, resolved in version 2.4.67.",
          "title": "Summary"
        },
        {
          "category": "general",
          "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N",
          "title": "CVSSV4"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-33857 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-33857.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1"
          ]
        }
      ],
      "title": "CVE-2026-33857"
    },
    {
      "cve": "CVE-2026-34032",
      "cwe": {
        "id": "CWE-125",
        "name": "Out-of-bounds Read"
      },
      "notes": [
        {
          "category": "other",
          "text": "Out-of-bounds Read",
          "title": "CWE-125"
        },
        {
          "category": "other",
          "text": "Improper Null Termination",
          "title": "CWE-170"
        },
        {
          "category": "description",
          "text": "Apache HTTP Server versions up to 2.4.66 contain an Improper Null Termination and Out-of-bounds Read vulnerability, which is addressed in version 2.4.67.",
          "title": "Summary"
        },
        {
          "category": "general",
          "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N",
          "title": "CVSSV4"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-34032 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-34032.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1"
          ]
        }
      ],
      "title": "CVE-2026-34032"
    },
    {
      "cve": "CVE-2026-34059",
      "cwe": {
        "id": "CWE-126",
        "name": "Buffer Over-read"
      },
      "notes": [
        {
          "category": "other",
          "text": "Buffer Over-read",
          "title": "CWE-126"
        },
        {
          "category": "description",
          "text": "A buffer over-read vulnerability in Apache HTTP Server versions up to 2.4.66 has been addressed in version 2.4.67, requiring users to upgrade to resolve the issue.",
          "title": "Summary"
        },
        {
          "category": "general",
          "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N",
          "title": "CVSSV4"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-34059 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-34059.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1"
          ]
        }
      ],
      "title": "CVE-2026-34059"
    }
  ]
}


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Tags
Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.