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body-parser <1.20.3 is vulnerable to denial of service when url encoding is enabled. A malicious actor using a specially crafted payload could flood the server with a large number of requests, resulting in denial of service.
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.
The reason for this release is a fix to the extended urlencoded parser returning objects instead of arrays for large array inputs (> 100) on qs@6.14.2+. (#716)
refactor(json): simplify strict mode error string construction by @jonchurch in #692
fix: correct off-by-one error in parameterCount by @abhu85 in #716
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chore(deps): update peerdependency body-parser to ^1.20.3 [security]
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This PR contains the following updates:
^1.20.2→^1.20.6body-parser vulnerable to denial of service when url encoding is enabled
CVE-2024-45590 / GHSA-qwcr-r2fm-qrc7
More information
Details
Impact
body-parser <1.20.3 is vulnerable to denial of service when url encoding is enabled. A malicious actor using a specially crafted payload could flood the server with a large number of requests, resulting in denial of service.
Patches
this issue is patched in 1.20.3
References
Severity
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NReferences
This data is provided by the GitHub Advisory Database (CC-BY 4.0).
body-parser vulnerable to denial of service when invalid limit value silently disables size enforcement
CVE-2026-12590 / GHSA-v422-hmwv-36x6
More information
Details
Impact
When body-parser is configured with an invalid
limitoption value, such as an unparseable string orNaN,bytes.parse()returnsnulland the request body size check is silently skipped. Applications that rely onlimitas 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
limitoption 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
limitvalues throw a clear error at parser construction time instead of silently disabling enforcement.nullandundefinedcontinue to fall back to the default limit (100kb).Workarounds
Validate
limitbefore passing it to body-parser. For example, parse the value withbytes.parse()at startup and reject any configuration where it returnsnullor a non-finite number.References
Severity
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:LReferences
This data is provided by the GitHub Advisory Database (CC-BY 4.0).
Release Notes
expressjs/body-parser (body-parser)
v1.20.6Compare Source
What's Changed
Full Changelog: expressjs/body-parser@1.20.5...1.20.6
v1.20.5Compare Source
What's Changed
The reason for this release is a fix to the extended urlencoded parser returning objects instead of arrays for large array inputs (> 100) on qs@6.14.2+. (#716)
New Contributors
Special thanks to triager @krzysdz for keeping this on our radar and effectively triaging the specific issue!
Full Changelog: expressjs/body-parser@1.20.4...1.20.5
v1.20.4Compare Source
===================
v1.20.3Compare Source
===================
depthoption to customize the depth level in the parserdepthlevel for parsing URL-encoded data is now32(previously wasInfinity)Configuration
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