Vulnerability-Lookup

GHSA-V422-HMWV-36X6

Vulnerability from github – Published: 2026-07-20 23:23 – Updated: 2026-07-20 23:23

Summary

body-parser vulnerable to denial of service when invalid limit value silently disables size enforcement

Details

Impact

When body-parser is configured with an invalid limit option value, such as an unparseable string or NaN, bytes.parse() returns null and the request body size check is silently skipped. Applications that rely on limit as their primary safeguard against oversized request bodies will accept arbitrarily large payloads, leading to excessive memory and CPU usage and denial of service.

This issue affects applications that pass a programmatically computed or user-configurable value to the limit option without validating it first.

Patches

This issue is fixed in body-parser@2.3.0 and body-parser@1.20.6 via #698. After the fix, invalid limit values throw a clear error at parser construction time instead of silently disabling enforcement. null and undefined continue to fall back to the default limit (100kb).

Workarounds

Validate limit before passing it to body-parser. For example, parse the value with bytes.parse() at startup and reject any configuration where it returns null or a non-finite number.

References

#698: fix PR
bytes.js: limit parser

Severity

3.7 (Low)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "body-parser"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.20.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "body-parser"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.0"
            },
            {
              "fixed": "2.3.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-12590"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-20T23:23:26Z",
    "nvd_published_at": "2026-07-09T11:16:24Z",
    "severity": "LOW"
  },
  "details": "### Impact\n\nWhen body-parser is configured with an invalid `limit` option value, such as an unparseable string or `NaN`, `bytes.parse()` returns `null` and the request body size check is silently skipped. Applications that rely on `limit` as their primary safeguard against oversized request bodies will accept arbitrarily large payloads, leading to excessive memory and CPU usage and denial of service.\n\nThis issue affects applications that pass a programmatically computed or user-configurable value to the `limit` option without validating it first.\n\n### Patches\n\nThis issue is fixed in [body-parser@2.3.0](https://github.com/expressjs/body-parser/releases/tag/v2.3.0) and [body-parser@1.20.6](https://github.com/expressjs/body-parser/releases/tag/v1.20.6) via [#698](https://github.com/expressjs/body-parser/pull/698). After the fix, invalid `limit` values throw a clear error at parser construction time instead of silently disabling enforcement. `null` and `undefined` continue to fall back to the default limit (`100kb`).\n\n### Workarounds\n\nValidate `limit` before passing it to body-parser. For example, parse the value with [`bytes.parse()`](https://github.com/visionmedia/bytes.js) at startup and reject any configuration where it returns `null` or a non-finite number.\n\n### References\n\n- [#698](https://github.com/expressjs/body-parser/pull/698): fix PR\n- [bytes.js](https://github.com/visionmedia/bytes.js): limit parser",
  "id": "GHSA-v422-hmwv-36x6",
  "modified": "2026-07-20T23:23:26Z",
  "published": "2026-07-20T23:23:26Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/expressjs/body-parser/security/advisories/GHSA-v422-hmwv-36x6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-12590"
    },
    {
      "type": "WEB",
      "url": "https://github.com/expressjs/body-parser/pull/698"
    },
    {
      "type": "WEB",
      "url": "https://github.com/expressjs/body-parser/pull/741"
    },
    {
      "type": "WEB",
      "url": "https://github.com/expressjs/body-parser/commit/2322e111cc321413ec2b7b76d01be533d3de9d7d"
    },
    {
      "type": "WEB",
      "url": "https://github.com/expressjs/body-parser/commit/3492672eee593d5c158f239b6e9115498a5dbeac"
    },
    {
      "type": "WEB",
      "url": "https://cna.openjsf.org/security-advisories.html"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/expressjs/body-parser"
    },
    {
      "type": "WEB",
      "url": "https://github.com/expressjs/body-parser/releases/tag/1.20.6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/expressjs/body-parser/releases/tag/v2.3.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "body-parser vulnerable to denial of service when invalid limit value silently disables size enforcement"
}

CVE-2026-12590 (GCVE-0-2026-12590)

Vulnerability from cvelistv5 – Published: 2026-07-09 10:21 – Updated: 2026-07-09 12:06

Title

body-parser vulnerable to denial of service when invalid limit value silently disables size enforcement

Summary

Impact: In body-parser versions prior to 1.20.6 (1.x line) and 2.3.0 (2.x line), when the parser is configured with an invalid limit option value such as an unparseable string or NaN, bytes.parse returns null and the request body size check is silently skipped. Applications that rely on limit as their primary safeguard against oversized request bodies will accept arbitrarily large payloads, leading to excessive memory and CPU usage and denial of service. Patches: This issue is fixed in body-parser 1.20.6 and 2.3.0. After the fix, invalid limit values throw a clear error at parser construction time instead of silently disabling enforcement, while null and undefined continue to fall back to the default limit of 100kb. Workarounds: Validate the limit value before passing it to body-parser. For example, parse the value at startup and reject any configuration where the result is null or a non-finite number.

Severity

3.7 (Low)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

openjs

References

2 references

URL	Tags
https://github.com/expressjs/body-parser/security…
https://cna.openjsf.org/security-advisories.html

Impacted products

1 product

Vendor	Product	Version
body-parser	body-parser	Affected: 0 , < 1.20.6 (semver) Unaffected: 1.20.6 (semver) Affected: 2.0.0 , < 2.3.0 (semver) Unaffected: 2.3.0 (semver)

Credits

Phillip9587 UlisesGascon bjohansebas

Show details on NVD website

JSON

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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

GHSA-V422-HMWV-36X6

Impact

Patches

Workarounds

References

CVE-2026-12590 (GCVE-0-2026-12590)

Tags

Sightings

Nomenclature