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DEBIAN-CVE-2026-28525

Type: advisorySource: OSV1 source record

SWUpdate contains an integer underflow vulnerability in the multipart upload parser in mongoose_multipart.c that allows unauthenticated attackers to cause a denial of service by sending a crafted HTTP POST request to /upload with a malformed multipart boundary and controlled TCP stream timing. Attackers can trigger an integer underflow in the mg_http_multipart_continue_wait_for_chunk() function when the buffer length falls within a specific range, causing an out-of-bounds heap read past the allocated receive buffer to a local IPC socket.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-28525

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-28525

swupdate

Source reference: /affected/0/package/name

Affected versions
2022.12+dfsg-4

Source reference: /affected/0/versions

2022.12+dfsg-4+deb12u1

Source reference: /affected/0/versions

2022.12+dfsg-4+deb12u1~bpo11+1

Source reference: /affected/0/versions

Fixed versions
2022.12+dfsg-4+deb12u2

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

swupdate

Source reference: /affected/1/package/name

Affected versions
2024.12.1+dfsg-3

Source reference: /affected/1/versions

2024.12.1+dfsg-3+deb13u1

Source reference: /affected/1/versions

Fixed versions
2024.12.1+dfsg-3+deb13u2

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

swupdate

Source reference: /affected/2/package/name

Affected versions
2024.12.1+dfsg-3

Source reference: /affected/2/versions

2025.05+dfsg-1

Source reference: /affected/2/versions

2025.05+dfsg-2

Source reference: /affected/2/versions

2025.05+dfsg-2~bpo13+1

Source reference: /affected/2/versions

2025.05+dfsg-3

Source reference: /affected/2/versions

2025.05+dfsg-3~bpo13+1

Source reference: /affected/2/versions

2025.12+dfsg-1

Source reference: /affected/2/versions

2025.12+dfsg-2

Source reference: /affected/2/versions

2025.12+dfsg-2~bpo13+1

Source reference: /affected/2/versions

2025.12+dfsg-3

Source reference: /affected/2/versions

2025.12+dfsg-4

Source reference: /affected/2/versions

2025.12+dfsg-5

Source reference: /affected/2/versions

2025.12+dfsg-6

Source reference: /affected/2/versions

2025.12+dfsg-7

Source reference: /affected/2/versions

2025.12+dfsg-7~bpo13+1

Source reference: /affected/2/versions

2025.12+dfsg-8

Source reference: /affected/2/versions

Fixed versions
2025.12+dfsg-9

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2022.12+dfsg-4+deb12u2"
          }
        ]
      }
    ],
    "package": {
      "name": "swupdate",
      "purl": "pkg:deb/debian/swupdate?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "2022.12+dfsg-4",
      "2022.12+dfsg-4+deb12u1",
      "2022.12+dfsg-4+deb12u1~bpo11+1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-28525.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2024.12.1+dfsg-3+deb13u2"
          }
        ]
      }
    ],
    "package": {
      "name": "swupdate",
      "purl": "pkg:deb/debian/swupdate?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "2024.12.1+dfsg-3",
      "2024.12.1+dfsg-3+deb13u1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-28525.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2025.12+dfsg-9"
          }
        ]
      }
    ],
    "package": {
      "name": "swupdate",
      "purl": "pkg:deb/debian/swupdate?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "2024.12.1+dfsg-3",
      "2025.05+dfsg-1",
      "2025.05+dfsg-2",
      "2025.05+dfsg-2~bpo13+1",
      "2025.05+dfsg-3",
      "2025.05+dfsg-3~bpo13+1",
      "2025.12+dfsg-1",
      "2025.12+dfsg-2",
      "2025.12+dfsg-2~bpo13+1",
      "2025.12+dfsg-3",
      "2025.12+dfsg-4",
      "2025.12+dfsg-5",
      "2025.12+dfsg-6",
      "2025.12+dfsg-7",
      "2025.12+dfsg-7~bpo13+1",
      "2025.12+dfsg-8"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-28525.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56338 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement