CVE-2026-12590

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.

Database specific

{
    "cwe_ids": [
        "CWE-770"
    ],
    "cna_assigner": "openjs",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12590.json"
}

References

Affected packages

Git / github.com/expressjs/body-parser

Affected ranges

Type

GIT

Repo

https://github.com/expressjs/body-parser

Events

Introduced

Fixed

5cc4fb8867c93a3aa4455927e38858c9ab89ff43

Introduced

9e06a79ca94da7c603a03d7deec56a54f8951330

Fixed

d0f2ace6c74769da7d19b8661b9a01c01bdb0bf7

Database specific

{
    "source": "CPE_RANGE",
    "cpe": "cpe:2.3:a:openjsf:body-parser:*:*:*:*:*:node.js:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.20.6"
        },
        {
            "introduced": "2.0.0"
        },
        {
            "fixed": "2.3.0"
        }
    ]
}

Affected versions

1.*

1.0.0

1.0.1

1.0.2

1.1.0

1.1.1

1.1.2

1.10.0

1.10.1

1.10.2

1.11.0

1.12.0

1.12.1

1.12.2

1.12.3

1.12.4

1.13.0

1.13.1

1.13.2

1.13.3

1.14.0

1.14.1

1.14.2

1.15.0

1.15.1

1.15.2

1.16.0

1.16.1

1.17.0

1.17.1

1.17.2

1.18.0

1.18.1

1.18.2

1.18.3

1.19.0

1.19.1

1.19.2

1.2.0

1.2.1

1.2.2

1.20.0

1.20.1

1.20.2

1.20.3

1.20.4

1.20.5

1.3.0

1.3.1

1.4.0

1.4.1

1.4.2

1.4.3

1.5.0

1.5.1

1.5.2

1.6.0

1.6.1

1.6.2

1.6.3

1.6.4

1.6.5

1.6.6

1.6.7

1.7.0

1.8.0

1.8.1

1.8.2

1.8.3

1.8.4

1.9.0

1.9.1

1.9.2

1.9.3

2.*

2.0.0

2.0.1

v2.*

v2.1.0

v2.2.0

v2.2.1

v2.2.2

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-12590.json"