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libmicrohttpd — security advisory

Type: advisorySources: OSVAdvisory ID: DEBIAN-CVE-2025-62689

NULL pointer dereference vulnerability exists in GNU libmicrohttpd v1.0.2 and earlier. The vulnerability was fixed in commit ff13abc on the master branch of the libmicrohttpd Git repository, after the v1.0.2 tag. A specially crafted packet sent by an attacker could cause a denial-of-service (DoS) condition.

Products
libmicrohttpd
Affected versions
0.9.75-6, 0.9.76-1, 0.9.77-1, 0.9.77-2, 0.9.77-3, 1.0.0-1, 1.0.0-1.1~exp1, 1.0.0-2, 1.0.0-2.1, 1.0.0-2.1~exp1, 1.0.1-1, 1.0.1-2, 1.0.1-3, 1.0.1-4, 1.0.10-1, 1.0.2-1, 1.0.2-1~exp1, 1.0.2-2, 1.0.3-1, 1.0.4-1, 1.0.4-2, 1.0.5-1, 1.0.6-1, 1.0.7-1, 1.0.8-1, 1.0.9-1
Fixed versions
Not specified
CVEs
CVE-2025-62689
Confirmed fixed CVEs
Not specified
Updated in this feed
28 Oct 2026, 09:02 UTC · Revision 1

Source evidence

DEBIAN-CVE-2025-62689

core-osv · Original source

Published 10 Nov 2025, 05:15 UTC

NULL pointer dereference vulnerability exists in GNU libmicrohttpd v1.0.2 and earlier. The vulnerability was fixed in commit ff13abc on the master branch of the libmicrohttpd Git repository, after the v1.0.2 tag. A specially crafted packet sent by an attacker could cause a denial-of-service (DoS) condition.

osv:DEBIAN-CVE-2025-62689

libmicrohttpd

Fixed versions: Not specified

libmicrohttpd

Fixed versions: Not specified

libmicrohttpd

Fixed versions: Not specified

Complete source record
{
  "id": "7eedcefca3979a2d8098530dc0849999d52f56e097486ae7bf3b2c88a526eb01",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2025-62689",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2025-62689",
    "summary": "NULL pointer dereference vulnerability exists in GNU libmicrohttpd v1.0.2 and earlier. The vulnerability was fixed in commit ff13abc on the master branch of the libmicrohttpd Git repository, after the v1.0.2 tag. A specially crafted packet sent by an attacker could cause a denial-of-service (DoS) condition.",
    "evidence": "osv:DEBIAN-CVE-2025-62689",
    "products": [
      {
        "name": {
          "value": "libmicrohttpd",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "0.9.75-6",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.9.76-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.9.77-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.9.77-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.9.77-3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.0-1.1~exp1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.0-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.0-2.1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.0-2.1~exp1",
            "evidence": "/affected/0/versions"
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          {
            "value": "1.0.1-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.1-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.1-3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.1-4",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.10-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.2-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.2-1~exp1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.2-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.3-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.4-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.4-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.5-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.6-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.7-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.8-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.9-1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "libmicrohttpd",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.0.1-4",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.0.10-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.0.2-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.0.2-1~exp1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.0.2-2",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.0.3-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.0.4-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.0.4-2",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.0.5-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.0.6-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.0.7-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.0.8-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.0.9-1",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "libmicrohttpd",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.0.1-4",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1.0.10-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1.0.2-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1.0.2-1~exp1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1.0.2-2",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1.0.3-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1.0.4-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1.0.4-2",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1.0.5-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1.0.6-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1.0.7-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1.0.8-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1.0.9-1",
            "evidence": "/affected/2/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "DEBIAN-CVE-2025-62689",
      "aliases": [
        "DEBIAN-CVE-2025-62689"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "libmicrohttpd",
            "purl": "pkg:deb/debian/libmicrohttpd?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "versions": [
            "0.9.75-6",
            "0.9.76-1",
            "0.9.77-1",
            "0.9.77-2",
            "0.9.77-3",
            "1.0.0-1",
            "1.0.0-1.1~exp1",
            "1.0.0-2",
            "1.0.0-2.1",
            "1.0.0-2.1~exp1",
            "1.0.1-1",
            "1.0.1-2",
            "1.0.1-3",
            "1.0.1-4",
            "1.0.10-1",
            "1.0.2-1",
            "1.0.2-1~exp1",
            "1.0.2-2",
            "1.0.3-1",
            "1.0.4-1",
            "1.0.4-2",
            "1.0.5-1",
            "1.0.6-1",
            "1.0.7-1",
            "1.0.8-1",
            "1.0.9-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-62689.json"
          },
          "ecosystem_specific": {
            "urgency": "unimportant"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "libmicrohttpd",
            "purl": "pkg:deb/debian/libmicrohttpd?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "versions": [
            "1.0.1-4",
            "1.0.10-1",
            "1.0.2-1",
            "1.0.2-1~exp1",
            "1.0.2-2",
            "1.0.3-1",
            "1.0.4-1",
            "1.0.4-2",
            "1.0.5-1",
            "1.0.6-1",
            "1.0.7-1",
            "1.0.8-1",
            "1.0.9-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-62689.json"
          },
          "ecosystem_specific": {
            "urgency": "unimportant"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "libmicrohttpd",
            "purl": "pkg:deb/debian/libmicrohttpd?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "1.0.1-4",
            "1.0.10-1",
            "1.0.2-1",
            "1.0.2-1~exp1",
            "1.0.2-2",
            "1.0.3-1",
            "1.0.4-1",
            "1.0.4-2",
            "1.0.5-1",
            "1.0.6-1",
            "1.0.7-1",
            "1.0.8-1",
            "1.0.9-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-62689.json"
          },
          "ecosystem_specific": {
            "urgency": "unimportant"
          }
        }
      ],
      "modified": "2026-10-08T09:47:29.336435461Z",
      "provider": "osv",
      "upstream": [
        "CVE-2025-62689"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2025-62689"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2025-62689",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 98875,
  "published_at": "2025-11-10T05:15:49.087+00:00"
}