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DEBIAN-CVE-2026-93753

Type: advisorySource: OSV1 source record

deepmerge through 4.3.1 contains a prototype poisoning vulnerability in the mergeObject() function that fails to properly validate keys being written to target objects. Attackers can supply malicious source objects in merge operations to inject attacker-controlled properties into the returned object's prototype, causing applications to inherit unintended values when accessing properties without own-property checks.

Announced Group revision 1
Original source ↗

DEBIAN-CVE-2026-93753

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-2026-93753

node-deepmerge

Source reference: /affected/0/package/name

Affected versions
4.2.2+~1.1.1-3

Source reference: /affected/0/versions

4.3.1+~1.1.1-1

Source reference: /affected/0/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

node-deepmerge

Source reference: /affected/1/package/name

Affected versions
4.3.1+~1.1.1-1

Source reference: /affected/1/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

node-deepmerge

Source reference: /affected/2/package/name

Affected versions
4.3.1+~1.1.1-1

Source reference: /affected/2/versions

Fixed versions
Not stated in this record
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"
          }
        ]
      }
    ],
    "package": {
      "name": "node-deepmerge",
      "purl": "pkg:deb/debian/node-deepmerge?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "4.2.2+~1.1.1-3",
      "4.3.1+~1.1.1-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-93753.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "node-deepmerge",
      "purl": "pkg:deb/debian/node-deepmerge?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "4.3.1+~1.1.1-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-93753.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "node-deepmerge",
      "purl": "pkg:deb/debian/node-deepmerge?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "4.3.1+~1.1.1-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-93753.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#6110 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. DEBIAN-CVE-2026-93753 · Revision 1Source updated