CVSS 3.0
2.9 lowCVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:LCVE-2026-123862 Node.js is vulnerable to a zlib denial of service via a stream destroy during a pending params() call
Low (2.9) in nodejs node. EPSS 0.1% estimated probability of exploitation activity in the next 30 days.
On this page
An uncatchable exception in the Node.js zlib streaming API lets a peer crash a process by disconnecting while data is being compressed. zlib.params() queues a flush and completes its work in that write's callback; if the stream is destroyed first, as pipeline() does when the peer goes away, Writable still invokes the callback with an error, but the callback ignores its arguments and asserts that the native handle still exists. The handle is gone, so an ERR_INTERNAL_ASSERTION is thrown from inside stream internals and bypasses the stream's error event, the params() callback, and the pipeline() callback, terminating the process. An application is affected only if it calls deflate.params() while streaming to a peer, which is uncommon. This vulnerability affects Node.js 26.x, 24.x, and 22.x.
Severity
- EPSS
- 0.1% estimated probability of exploitation activity in the next 30 days; 4th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
- CWE
- CWE-248 Uncaught Exception
- OWASP Top 10
- A10:2025 Mishandling of Exceptional Conditions
- Published
- Modified
- Assigned by
- openjs (CNA)
- NVD analysis
- Awaiting analysis
- Record from
- the NVD, synced
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Affected
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| nodejs node | from 0.0.0 before 22.23.5 |
| nodejs node | from 23.0.0 before 24.22.3 |
| nodejs node | from 25.0.0 before 26.13.1 |
Fix and patched versions
- Red Hat, Alpine, Alpaquita, BellSoft Hardened Containers: fixed package versions per release
Linux distributions
| Distribution | Release | Package | Fixed in | Advisory |
|---|---|---|---|---|
| Debian | 12, 13, 14 | nodejs | no fix listed | DEBIAN-CVE-2026-123862 |
| Ubuntu | 24.04:LTS, 26.04:LTS, 26.10 and 5 more | nodejs | no fix listed | UBUNTU-CVE-2026-123862 |
| Red Hat | hummingbird:1 | nodejs22, nodejs22-bin, nodejs22-docs and 4 more | 1:22.23.5-2.3.2.3.1.hum1 | RHSA-2026:99433 |
| Red Hat | hummingbird:1 | nodejs22-npm | 1:10.9.9-1.22.23.5.2.3.2.3.1.hum1 | RHSA-2026:99433 |
| Red Hat | hummingbird:1 | nodejs24, nodejs24-bin, nodejs24-docs and 3 more | 1:24.22.3-0.1.hum1 | RHSA-2026:99435 |
| Red Hat | hummingbird:1 | nodejs24-npm | 2:11.19.1-1.24.22.3.0.1.hum1 | RHSA-2026:99435 |
| Red Hat | hummingbird:1 | nodejs24-npm-bin | 2:24.22.3-0.1.hum1 | RHSA-2026:99435 |
| Red Hat | hummingbird:1 | nodejs26, nodejs26-bin, nodejs26-docs and 4 more | 1:26.13.1-0.1.hum1 | RHSA-2026:99436 |
| Red Hat | hummingbird:1 | nodejs26-npm | 1:11.20.0-1.26.13.1.0.1.hum1 | RHSA-2026:99436 |
| Alpine | v3.21, v3.22 | nodejs | 22.23.5-r0 | ALPINE-CVE-2026-123862 |
| Alpine | v3.23, v3.24 | nodejs | 24.22.3-r0 | ALPINE-CVE-2026-123862 |
| Alpine | v3.24 | nodejs-current | 26.13.1-r0 | ALPINE-CVE-2026-123862 |
| Alpaquita | stream | nodejs22 | 22.23.5-r0 | BELL-CVE-2026-123862 |
| Alpaquita | stream | nodejs24 | 24.22.3-r0 | BELL-CVE-2026-123862 |
| Alpaquita | stream | nodejs26 | 26.13.1-r0 | BELL-CVE-2026-123862 |
| BellSoft Hardened Containers | stream | nodejs22 | 22.23.5-r0 | BELL-CVE-2026-123862 |
| BellSoft Hardened Containers | stream | nodejs24 | 24.22.3-r0 | BELL-CVE-2026-123862 |
| BellSoft Hardened Containers | stream | nodejs26 | 26.13.1-r0 | BELL-CVE-2026-123862 |
From the distributions' data via OSV.dev: the Debian Security Tracker; Ubuntu Security Notices © Canonical Ltd., CC BY-SA 4.0; Red Hat Security Data © Red Hat, Inc., CC BY 4.0; the Alpine secdb, CC BY-SA 4.0; BellSoft's OSV database, MIT. Modified: reformatted and linked to CVE records. Credits. On the distributions' own pages: Debian · Ubuntu · Red Hat · Alpine · Alpaquita · BellSoft Hardened Containers.
Red Hat
Red Hat rates this Moderate.
This vulnerability is rated as Moderate because although a remote unauthenticated attacker can crash the runtime environment, successful exploitation requires precise timing alongside an uncommon programming pattern. In typical Red Hat enterprise environments, applications rarely dynamically adjust compression parameters during active data transmission to remote clients. Consequently, the blast radius is restricted to custom implementations that explicitly reconfigure stream parameters on in-flight traffic.
Avoid calling zlib.params() while streaming compressed output to a remote peer. Prefer fixed compression settings for long-lived streams, and handle peer disconnects without destroying a zlib stream that still has a pending params() flush.
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | nodejs22 | Fix deferred | |
| Red Hat Enterprise Linux 10 | nodejs24 | Fix deferred | |
| Red Hat Enterprise Linux 10 | nodejs26 | Fix deferred | |
| Red Hat Enterprise Linux 8 | nodejs:22/nodejs | Fix deferred | |
| Red Hat Enterprise Linux 8 | nodejs:24/nodejs | Fix deferred | |
| Red Hat Enterprise Linux 9 | nodejs:22/nodejs | Fix deferred | |
| Red Hat Enterprise Linux 9 | nodejs:24/nodejs | Fix deferred | |
| Red Hat Enterprise Linux 9 | nodejs:26/nodejs | Fix deferred | |
| Red Hat Hardened Images | hi/nodejs | Under investigation | |
| Red Hat Hardened Images | nodejs20 | Will not fix | |
| Red Hat Hardened Images | nodejs22 | Affected | |
| Red Hat Hardened Images | nodejs24 | Affected | |
| Red Hat Hardened Images | nodejs25 | Will not fix | |
| Red Hat Hardened Images | nodejs26 | Affected | |
| Red Hat Hardened Images | npm12 | Under investigation |
Contains Red Hat Security Data © Red Hat, Inc., licensed under CC BY 4.0. Source: https://access.redhat.com/security/data. Modified: reformatted. Red Hat's page for CVE-2026-123862.