Bug 2431340 (CVE-2026-21637) - CVE-2026-21637 nodejs: Nodejs denial of service
Summary: CVE-2026-21637 nodejs: Nodejs denial of service
Keywords:
Status: NEW
Alias: CVE-2026-21637
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2431457 2431458 2431459 2431460 2431461 2431462 2431463
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-01-20 21:01 UTC by OSIDB Bzimport
Modified: 2026-04-13 02:47 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2026:2447 0 None None None 2026-02-10 14:22:51 UTC
Red Hat Product Errata RHBA-2026:2815 0 None None None 2026-02-17 11:23:57 UTC
Red Hat Product Errata RHSA-2026:1842 0 None None None 2026-02-05 15:58:40 UTC
Red Hat Product Errata RHSA-2026:1843 0 None None None 2026-02-05 15:58:32 UTC
Red Hat Product Errata RHSA-2026:2420 0 None None None 2026-02-10 12:45:38 UTC
Red Hat Product Errata RHSA-2026:2421 0 None None None 2026-02-10 12:45:12 UTC
Red Hat Product Errata RHSA-2026:2422 0 None None None 2026-02-10 12:44:56 UTC
Red Hat Product Errata RHSA-2026:2781 0 None None None 2026-02-17 09:25:17 UTC
Red Hat Product Errata RHSA-2026:2782 0 None None None 2026-02-17 09:25:34 UTC
Red Hat Product Errata RHSA-2026:2783 0 None None None 2026-02-17 09:26:12 UTC
Red Hat Product Errata RHSA-2026:7350 0 None None None 2026-04-09 20:20:09 UTC
Red Hat Product Errata RHSA-2026:7670 0 None None None 2026-04-13 02:47:15 UTC
Red Hat Product Errata RHSA-2026:7675 0 None None None 2026-04-13 02:22:39 UTC

Description OSIDB Bzimport 2026-01-20 21:01:51 UTC 
A flaw in Node.js TLS error handling allows remote attackers to crash or exhaust resources of a TLS server when `pskCallback` or `ALPNCallback` are in use. Synchronous exceptions thrown during these callbacks bypass standard TLS error handling paths (tlsClientError and error), causing either immediate process termination or silent file descriptor leaks that eventually lead to denial of service. Because these callbacks process attacker-controlled input during the TLS handshake, a remote client can repeatedly trigger the issue. This vulnerability affects TLS servers using PSK or ALPN callbacks across Node.js versions where these callbacks throw without being safely wrapped.
Comment 2 errata-xmlrpc 2026-02-05 15:58:31 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:1843 https://access.redhat.com/errata/RHSA-2026:1843
Comment 3 errata-xmlrpc 2026-02-05 15:58:39 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:1842 https://access.redhat.com/errata/RHSA-2026:1842
Comment 4 errata-xmlrpc 2026-02-10 12:44:55 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:2422 https://access.redhat.com/errata/RHSA-2026:2422
Comment 5 errata-xmlrpc 2026-02-10 12:45:11 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:2421 https://access.redhat.com/errata/RHSA-2026:2421
Comment 6 errata-xmlrpc 2026-02-10 12:45:37 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:2420 https://access.redhat.com/errata/RHSA-2026:2420
Comment 7 errata-xmlrpc 2026-02-17 09:25:16 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:2781 https://access.redhat.com/errata/RHSA-2026:2781
Comment 8 errata-xmlrpc 2026-02-17 09:25:33 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:2782 https://access.redhat.com/errata/RHSA-2026:2782
Comment 9 errata-xmlrpc 2026-02-17 09:26:11 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:2783 https://access.redhat.com/errata/RHSA-2026:2783
Comment 10 errata-xmlrpc 2026-04-09 20:20:07 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:7350 https://access.redhat.com/errata/RHSA-2026:7350
Comment 11 errata-xmlrpc 2026-04-13 02:22:38 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:7675 https://access.redhat.com/errata/RHSA-2026:7675
Comment 12 errata-xmlrpc 2026-04-13 02:47:14 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:7670 https://access.redhat.com/errata/RHSA-2026:7670
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