CVE-2026-21710

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Summary

CVECVE-2026-21710
StatePUBLISHED
Assignerhackerone
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-30 20:16:18 UTC
Updated2026-07-15 02:18:30 UTC
DescriptionA flaw in Node.js HTTP request handling causes an uncaught `TypeError` when a request is received with a header named `__proto__` and the application accesses `req.headersDistinct`. When this occurs, `dest["__proto__"]` resolves to `Object.prototype` rather than `undefined`, causing `.push()` to be called on a non-array. This exception is thrown synchronously inside a property getter and cannot be intercepted by `error` event listeners, meaning it cannot be handled without wrapping every `req.headersDistinct` access in a `try/catch`. * This vulnerability affects all Node.js HTTP servers on **20.x, 22.x, 24.x, and v25.x**

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from ADP

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

EPSS: 0.263560000 probability, percentile 0.977770000 (date 2026-07-18)

Problem Types: CWE-770 | CWE-843 | CWE-770 CWE-770 Allocation of Resources Without Limits or Throttling | CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')

VersionSourceTypeScoreSeverityVector
3.1ADPCVSS7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.10b0ca135-0b70-47e7-9f44-1890c2a1c46cSecondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.0[email protected]Secondary7.5HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.0CNADECLARED7.5HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Nodejs Node affected 20.20.1 20.20.1 semver Not specified
CNA Nodejs Node affected 22.22.1 22.22.1 semver Not specified
CNA Nodejs Node affected 24.14.0 24.14.0 semver Not specified
CNA Nodejs Node affected 25.8.1 25.8.1 semver Not specified
CNA Nodejs Node affected 4.0 4.* semver Not specified
CNA Nodejs Node affected 5.0 5.* semver Not specified
CNA Nodejs Node affected 6.0 6.* semver Not specified
CNA Nodejs Node affected 7.0 7.* semver Not specified
CNA Nodejs Node affected 8.0 8.* semver Not specified
CNA Nodejs Node affected 9.0 9.* semver Not specified
CNA Nodejs Node affected 10.0 10.* semver Not specified
CNA Nodejs Node affected 11.0 11.* semver Not specified
CNA Nodejs Node affected 12.0 12.* semver Not specified
CNA Nodejs Node affected 13.0 13.* semver Not specified
CNA Nodejs Node affected 14.0 14.* semver Not specified
CNA Nodejs Node affected 15.0 15.* semver Not specified
CNA Nodejs Node affected 16.0 16.* semver Not specified
CNA Nodejs Node affected 17.0 17.* semver Not specified
CNA Nodejs Node affected 18.0 18.* semver Not specified
CNA Nodejs Node affected 19.0 19.* semver Not specified
ADP Red Hat Red Hat Enterprise Linux 10 unaffected 1:22.22.2-1.el10_1 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 10 unaffected 1:24.14.1-2.el10_1 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support unaffected 1:22.22.2-2.el10_0 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 8 unaffected 8100020260331102257.6d880403 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 8 unaffected 8100020260408131901.6d880403 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 8 unaffected 8100020260414073138.489197e6 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 9 unaffected 9070020260401095228.rhel9 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 9 unaffected 9070020260402152654.rhel9 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 9 unaffected 9070020260409073121.rhel9 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support unaffected 9040020260421133644.rhel9 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support unaffected 9060020260409121057.rhel9 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support unaffected 9060020260422064119.rhel9 * rpm Not specified

References

ReferenceSourceLinkTags
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21710.json 0b0ca135-0b70-47e7-9f44-1890c2a1c46c security.access.redhat.com
access.redhat.com/errata/RHSA-2026:7310 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:7675 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:7123 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:8339 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/security/cve/CVE-2026-21710 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:9711 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:7983 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:7896 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:7350 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:7302 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:9874 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:7670 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
nodejs.org/en/blog/vulnerability/march-2026-security-releases [email protected] nodejs.org
access.redhat.com/errata/RHSA-2026:7080 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
bugzilla.redhat.com/show_bug.cgi 0b0ca135-0b70-47e7-9f44-1890c2a1c46c bugzilla.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
ADP2026-03-30T20:01:21.196ZReported to Red Hat.
ADP2026-03-30T19:07:28.558ZMade public.

Solutions

ADP: RHSA-2026:7310: Red Hat Enterprise Linux AppStream EUS (v. 10.0)

ADP: RHSA-2026:7080: Red Hat Enterprise Linux AppStream (v. 10)

ADP: RHSA-2026:7675: Red Hat Enterprise Linux AppStream (v. 10)

ADP: RHSA-2026:8339: Red Hat Enterprise Linux AppStream (v. 8)

ADP: RHSA-2026:7123: Red Hat Enterprise Linux AppStream (v. 8)

ADP: RHSA-2026:7670: Red Hat Enterprise Linux AppStream (v. 8)

ADP: RHSA-2026:9711: Red Hat Enterprise Linux AppStream EUS (v.9.4)

ADP: RHSA-2026:9874: Red Hat Enterprise Linux AppStream EUS (v.9.6)

ADP: RHSA-2026:7983: Red Hat Enterprise Linux AppStream EUS (v.9.6)

ADP: RHSA-2026:7896: Red Hat Enterprise Linux AppStream (v. 9)

ADP: RHSA-2026:7302: Red Hat Enterprise Linux AppStream (v. 9)

ADP: RHSA-2026:7350: Red Hat Enterprise Linux AppStream (v. 9)

Workarounds

ADP: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

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