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TI-2026-74894 Aliases CVE-2026-109932GHSA-9fm3-97px-rjf6

Undici WebSocket client exhausts memory via unbounded PONG buffering

Priority LOW 33CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 2 fixed, 17 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-400.

Summary

undici versions from 5.15.0 before 6.29.1, from 7.0.0 before 7.30.1, and from 8.0.0 before 8.12.2 are affected, including the WebSocket client bundled in Node.js. The client writes a PONG for every received PING and ignores socket backpressure, which causes uncontrolled resource consumption (CWE-400). A malicious or compromised WebSocket server can send small PING frames and never read the PONGs, growing the outbound queue until the Node.js process runs out of memory.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

undici is an HTTP client library for Node.js. In versions 5.15.0 through 6.29.0, 7.0.0 through 7.30.0, and 8.0.0 through 8.12.1, its WebSocket client, including the bundled WebSocket exposed by Node.js, can be driven to exhaust process memory by a malicious or compromised WebSocket server. For every PING frame received, the client automatically writes a PONG response and ignores the backpressure signal from the socket write, so a server that streams small PING frames while never reading the client's PONGs makes the outbound write queue and heap grow without bound until the Node.js process runs out of memory and terminates. The attack is remote and unauthenticated, needs only a normal WebSocket connection, and is asymmetric, since small inbound PINGs produce a much larger retained outbound queue, with availability the only impact. The issue is fixed in undici 6.29.1, 7.30.1, and 8.12.2, which pause WebSocket frame parsing when the automatic PONG response hits socket backpressure and resume on drain, bounding the outbound queue, and users should upgrade to one of those versions or later. There is no workaround.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00321 25th percentileScored 2026-11-07
Fix Partial undici (undici): 6.29.1, 7.30.1, 8.12.2undici (npm): 6.29.1, 7.30.1, 8.12.2Red Hat: 4 advisoriesRed Hat: 2 fixed, 17 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
NodeJSundici5.15.0 to before 6.29.1; 7.0.0 to before 7.30.1; 8.0.0 to before 8.12.26.29.1, 7.30.1, 8.12.2Patch availableCNA
—undici (npm)5.15.0 to before 6.29.16.29.1Patch availableGHSA-9fm3-97px-rjf6
—undici (npm)7.0.0 to before 7.30.17.30.1Patch availableGHSA-9fm3-97px-rjf6
—undici (npm)8.0.0 to before 8.12.28.12.2Patch availableGHSA-9fm3-97px-rjf6
  • undici VendorNodeJS Affected 5.15.0 to before 6.29.1; 7.0.0 to before 7.30.1; 8.0.0 to before 8.12.2 Fixed in 6.29.1, 7.30.1, 8.12.2 Patch available CNA
  • undici (npm) Vendor— Affected 5.15.0 to before 6.29.1 Fixed in 6.29.1 Patch available GHSA-9fm3-97px-rjf6
  • undici (npm) Vendor— Affected 7.0.0 to before 7.30.1 Fixed in 7.30.1 Patch available GHSA-9fm3-97px-rjf6
  • undici (npm) Vendor— Affected 8.0.0 to before 8.12.2 Fixed in 8.12.2 Patch available GHSA-9fm3-97px-rjf6

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*5.15.0 to before 6.29.1; 7.0.0 to before 7.30.1; 8.0.0 to before 8.12.2VulnerableNodeJS
  • cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:* Versions 5.15.0 to before 6.29.1; 7.0.0 to before 7.30.1; 8.0.0 to before 8.12.2 Vulnerable ·NodeJS

Remediation

Upgrade undici to 6.29.1, 7.30.1, or 8.12.2 or later. Red Hat fixes are in RHSA-2026:95124 for Red Hat Trusted Artifact Signer 1.5 and in RHSA-2026:87703, RHSA-2026:84706 and RHSA-2026:84657 for Red Hat Hardened Images. Red Hat lists Cryostat 4, Red Hat AMQ Broker 7, Red Hat Enterprise Linux 8, 9 and 10, and other products as affected with no fix available, and Exploit Intelligence with no fix planned.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

  • Fix · CNA undici (undici) Fixed in 6.29.1, 7.30.1, 8.12.2
  • Fix · GHSA-9fm3-97px-rjf6 undici (npm) Fixed in 6.29.1 Advisory →
  • Fix · GHSA-9fm3-97px-rjf6 undici (npm) Fixed in 7.30.1 Advisory →
  • Fix · GHSA-9fm3-97px-rjf6 undici (npm) Fixed in 8.12.2 Advisory →

Red Hat 4 advisories

  • RHSA-2026:95124 Released 2026-11-04 · Red Hat rating Important
    RHTAS 1.5.1 - Red Hat Trusted Artifact Signer Release
    • Red Hat Trusted Artifact Signer 1.5 registry.redhat.io/rhtas/rhtas-console-rhel9, registry.redhat.io/rhtas/rhtas-console-ui-rhel9
  • RHSA-2026:87703 Released 2026-10-22 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images nodejs26-1:26.12.1-0.1.hum1@aarch64, nodejs26-1:26.12.1-0.1.hum1@s390x, nodejs26-1:26.12.1-0.1.hum1@src +22
  • RHSA-2026:84706 Released 2026-10-19 · Red Hat rating Important
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images nodejs24-24.21.0-1.5.hum1@aarch64, nodejs24-24.21.0-1.5.hum1@s390x, nodejs24-24.21.0-1.5.hum1@src +25
Show 1 more Red Hat advisories
  • RHSA-2026:84657 Released 2026-10-19 · Red Hat rating Important
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images nodejs26-26.11.1-0.4.hum1@aarch64, nodejs26-26.11.1-0.4.hum1@s390x, nodejs26-26.11.1-0.4.hum1@src +25

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    undici 6.29.1, 7.30.1, 8.12.2

    5 records Highest priority Priority MEDIUM 1 MEDIUM, 4 LOW

    Other records, highest priority first

    • TI-2026-74886 Certificate validation bypass in undici Agent drops custom TLS checksPriority MEDIUM 40
    • TI-2026-74890 Unhandled error in undici fetch() crashes Node.js processPriority LOW 39
    • TI-2026-74992 Denial of service in undici via TLS renegotiationPriority LOW 38
    Show all 5 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Cryostat 4AffectedNo fix yet: Fix deferred
Exploit IntelligenceAffectedNo fix planned: Out of support scope
Red Hat AMQ Broker 7AffectedNo fix yet: Fix deferred
Red Hat Ansible Automation Platform 2AffectedNo fix yet: Fix deferred
Red Hat Build of Podman DesktopAffectedNo fix yet: Fix deferred
Red Hat Developer Hub 1AffectedNo fix yet
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Red Hat Hardened ImagesAffectedNo fix planned: Will not fix
Red Hat OpenShift AI (RHOAI)AffectedNo fix yet: Fix deferred
Red Hat OpenShift Container Platform 4AffectedNo fix yet: Fix deferred
Red Hat OpenShift Container Platform 5AffectedNo fix yet: Fix deferred
Red Hat OpenShift Dev SpacesAffectedNo fix yet
Red Hat Openshift Data Foundation 4AffectedNo fix yet: Fix deferred
Secrets Management Console for Red Hat OpenShiftAffectedNo fix planned: Out of support scope
Self-service automation portal 2AffectedNo fix yet: Fix deferred
Red Hat Hardened ImagesFixed RHSA-2026:84657, RHSA-2026:84706, RHSA-2026:87703
Red Hat Trusted Artifact Signer 1.5Fixed RHSA-2026:95124
Not affected: 2 products
  • Red Hat Hardened Images
  • Red Hat Trusted Artifact Signer 1.5

Timeline

  1. 2026-10-16 Threatist record created from CVE-2026-109932
  2. 2026-10-16 Priority changed: MEDIUM → LOW
  3. 2026-10-16 Affected versions changed · Red Hat
  4. 2026-10-16 CVSS score added · Red Hat
  5. 2026-10-18 CISA SSVC decision points changed
  6. 2026-10-18 Affected versions changed · Red Hat
  7. 2026-10-19 Fix available: RHSA-2026:84657 · Red Hat
  8. 2026-10-19 Fix available: RHSA-2026:84706 · Red Hat
  9. 2026-10-20 CVSS score added · NVD
  10. 2026-10-20 Fix available: Red Hat Hardened Images · Red Hat
  11. 2026-10-22 Fix available: RHSA-2026:87703 · Red Hat
  12. 2026-10-23 Affected versions changed · Red Hat
  13. 2026-10-27 Affected versions changed · Red Hat
  14. 2026-10-27 Alias added: GHSA-9fm3-97px-rjf6
  15. 2026-10-30 Affected versions changed · Red Hat
  16. 2026-11-04 Fix available: RHSA-2026:95124 · Red Hat
  17. 2026-11-04 Fix available: Red Hat Trusted Artifact Signer 1.5 · Red Hat

References

Advisory 3

Other 7

  • TI-2026-01215 undici is vulnerable to Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') CVSS 3.1CRITICAL 9.8
  • TI-2022-16376 `undici.request` vulnerable to SSRF using absolute URL on `pathname` CVSS 3.1CRITICAL 9.8
  • TI-2023-09734 CRLF Injection in Nodejs ‘undici’ via host CVSS 3.1MEDIUM 6.5
  • TI-2022-13193 CRLF injection in request headers CVSS 3.1MEDIUM 6.5
  • TI-2022-16375 CRLF Injection in Nodejs ‘undici’ via Content-Type CVSS 3.1MEDIUM 5.3
  • TI-2022-13194 Uncleared cookies on cross-host/cross-origin redirect in undici CVSS 3.1MEDIUM 6.5
See all 51 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences