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DEBIAN-CVE-2026-2391

Type: advisorySource: OSV1 source record

### Summary The `arrayLimit` option in qs does not enforce limits for comma-separated values when `comma: true` is enabled, allowing attackers to cause denial-of-service via memory exhaustion. This is a bypass of the array limit enforcement, similar to the bracket notation bypass addressed in GHSA-6rw7-vpxm-498p (CVE-2025-15284). ### Details When the `comma` option is set to `true` (not the default, but configurable in applications), qs allows parsing comma-separated strings as arrays (e.g., `?param=a,b,c` becomes `['a', 'b', 'c']`). However, the limit check for `arrayLimit` (default: 20) and the optional throwOnLimitExceeded occur after the comma-handling logic in `parseArrayValue`, enabling a bypass. This permits creation of arbitrarily large arrays from a single parameter, leading to excessive memory allocation. **Vulnerable code** (lib/parse.js: lines ~40-50): ```js if (val && typeof val === 'string' && options.comma && val.indexOf(',') > -1) { return val.split(','); } if (options.throwOnLimitExceeded && currentArrayLength >= options.arrayLimit) { throw new RangeError('Array limit exceeded. Only ' + options.arrayLimit + ' element' + (options.arrayLimit === 1 ? '' : 's') + ' allowed in an array.'); } return val; ``` The `split(',')` returns the array immediately, skipping the subsequent limit check. Downstream merging via `utils.combine` does not prevent allocation, even if it marks overflows for sparse arrays.This discrepancy allows attackers to send a single parameter wi

Announced Group revision 1
Original source ↗

DEBIAN-CVE-2026-2391

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-2026-2391

node-qs

Source reference: /affected/0/package/name

Affected versions
6.11.0+ds+~6.9.7-3

Source reference: /affected/0/versions

6.11.0+ds+~6.9.7-4

Source reference: /affected/0/versions

6.13.0+ds+~6.9.16-1

Source reference: /affected/0/versions

6.14.1+ds+~6.14.0-1

Source reference: /affected/0/versions

6.15.0+ds+~6.15.0-1

Source reference: /affected/0/versions

6.15.0+ds+~6.15.0-2

Source reference: /affected/0/versions

6.15.0+ds+~6.15.0-3

Source reference: /affected/0/versions

6.15.2+ds+~6.15.1-1

Source reference: /affected/0/versions

6.16.0+ds+~6.15.1-1

Source reference: /affected/0/versions

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

node-qs

Source reference: /affected/1/package/name

Affected versions
6.13.0+ds+~6.9.16-1

Source reference: /affected/1/versions

6.14.1+ds+~6.14.0-1

Source reference: /affected/1/versions

6.15.0+ds+~6.15.0-1

Source reference: /affected/1/versions

6.15.0+ds+~6.15.0-2

Source reference: /affected/1/versions

6.15.0+ds+~6.15.0-3

Source reference: /affected/1/versions

6.15.2+ds+~6.15.1-1

Source reference: /affected/1/versions

6.16.0+ds+~6.15.1-1

Source reference: /affected/1/versions

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

node-qs

Source reference: /affected/2/package/name

Affected versions
6.13.0+ds+~6.9.16-1

Source reference: /affected/2/versions

6.14.1+ds+~6.14.0-1

Source reference: /affected/2/versions

Fixed versions
6.15.0+ds+~6.15.0-1

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"
          }
        ]
      }
    ],
    "package": {
      "name": "node-qs",
      "purl": "pkg:deb/debian/node-qs?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "6.11.0+ds+~6.9.7-3",
      "6.11.0+ds+~6.9.7-4",
      "6.13.0+ds+~6.9.16-1",
      "6.14.1+ds+~6.14.0-1",
      "6.15.0+ds+~6.15.0-1",
      "6.15.0+ds+~6.15.0-2",
      "6.15.0+ds+~6.15.0-3",
      "6.15.2+ds+~6.15.1-1",
      "6.16.0+ds+~6.15.1-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-2391.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "node-qs",
      "purl": "pkg:deb/debian/node-qs?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "6.13.0+ds+~6.9.16-1",
      "6.14.1+ds+~6.14.0-1",
      "6.15.0+ds+~6.15.0-1",
      "6.15.0+ds+~6.15.0-2",
      "6.15.0+ds+~6.15.0-3",
      "6.15.2+ds+~6.15.1-1",
      "6.16.0+ds+~6.15.1-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-2391.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "6.15.0+ds+~6.15.0-1"
          }
        ]
      }
    ],
    "package": {
      "name": "node-qs",
      "purl": "pkg:deb/debian/node-qs?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "6.13.0+ds+~6.9.16-1",
      "6.14.1+ds+~6.14.0-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-2391.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56249 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. DEBIAN-CVE-2026-2391 · Revision 1Source updated