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TI-2026-14936 Aliases CVE-2026-18149GHSA-pmjh-fq2x-6v4x

undici vulnerable to Denial of Service via orphaned RetryHandler response body

Priority LOW 27CWE-772Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 1 fixed, 9 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-772.

Summary

undici's retry handler can leave an already-exposed response body pending forever. When a server returns a successful response that declares a Content-Length, sends only part of the body, and closes the connection, the retry handler retries the request. If the retry returns a non-retryable status such as 400, the handler forwards that new response downstream and replaces its internal response stream, but the original response body that the application still holds is never ended or destroyed. As a result calls that read that body never settle, and the configured body timeout does not fire because its timer is tied to the connection parser rather than the orphaned body. An attacker-controlled server can trigger this with two short responses without keeping a connection open, and repeated requests accumulate pending promises and streams that can exhaust application concurrency or memory. This affects undici versions from 7.11.0 up to 7.29.1 and from 8.0.0 up to 8.10.2. Users should upgrade to undici 7.29.1 or 8.10.2.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00481 41st percentileScored 2026-11-07
Fix Partial undici (undici): 7.29.1, 8.10.2undici (npm): 7.29.1, 8.10.2Red Hat: 3 advisoriesRed Hat: 1 fixed, 9 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
NodeJSundici7.11.0 to before 7.29.1; 8.0.0 to before 8.10.27.29.1, 8.10.2Patch availableCNA
—undici (npm)7.11.0 to before 7.29.17.29.1Patch availableGHSA-pmjh-fq2x-6v4x
—undici (npm)8.0.0 to before 8.10.28.10.2Patch availableGHSA-pmjh-fq2x-6v4x
  • undici VendorNodeJS Affected 7.11.0 to before 7.29.1; 8.0.0 to before 8.10.2 Fixed in 7.29.1, 8.10.2 Patch available CNA
  • undici (npm) Vendor— Affected 7.11.0 to before 7.29.1 Fixed in 7.29.1 Patch available GHSA-pmjh-fq2x-6v4x
  • undici (npm) Vendor— Affected 8.0.0 to before 8.10.2 Fixed in 8.10.2 Patch available GHSA-pmjh-fq2x-6v4x

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*7.11.0 to before 7.29.1; 8.0.0 to before 8.10.2VulnerableNodeJS
  • cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:* Versions 7.11.0 to before 7.29.1; 8.0.0 to before 8.10.2 Vulnerable ·NodeJS

Remediation

  • Fix · CNA undici (undici) Fixed in 7.29.1, 8.10.2
  • Fix · GHSA-pmjh-fq2x-6v4x undici (npm) Fixed in 7.29.1 Advisory →
  • Fix · GHSA-pmjh-fq2x-6v4x undici (npm) Fixed in 8.10.2 Advisory →

Red Hat 3 advisories

  • RHSA-2026:66008 Released 2026-09-09 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images grafana12.4-12.4.10-0.2.hum1@aarch64, grafana12.4-12.4.10-0.2.hum1@src, grafana12.4-12.4.10-0.2.hum1@x86_64
  • RHSA-2026:54438 Released 2026-08-12 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images nodejs24-1:24.18.1-0.2.2.hum1@aarch64, nodejs24-1:24.18.1-0.2.2.hum1@src, nodejs24-1:24.18.1-0.2.2.hum1@x86_64 +14
  • RHSA-2026:54389 Released 2026-08-12 · Red Hat rating Important
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images nodejs26-1:26.7.0-1.5.2.hum1@aarch64, nodejs26-1:26.7.0-1.5.2.hum1@src, nodejs26-1:26.7.0-1.5.2.hum1@x86_64 +16

Fixed in the same release

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

  • Release ·

    undici 7.29.1, 8.10.2

    7 records Highest priority Priority MEDIUM 1 MEDIUM, 6 LOW

    Other records, highest priority first

    • TI-2026-58384 undici vulnerable to TLS certificate validation bypass via dropped connect options in BalancedPoolPriority MEDIUM 40
    • TI-2026-58374 undici vulnerable to cross-user cookie disclosure via Set-Cookie caching in shared cachesPriority LOW 35
    • TI-2026-58409 undici vulnerable to Denial of Service via WebSocketStream unclean closePriority LOW 33
    Show all 7 records →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
OpenShift PipelinesAffectedNo fix yet: Fix deferred
Red Hat Build of Podman DesktopAffectedNo fix yet: Fix deferred
Red Hat Developer Hub 1AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 10AffectedNo 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 Dev SpacesAffectedNo fix yet: Fix deferred
Red Hat Trusted Artifact SignerAffectedNo fix yet: Fix deferred
Red Hat Hardened ImagesFixed RHSA-2026:54389, RHSA-2026:54438, RHSA-2026:66008
Not affected: 12 products
  • Exploit Intelligence
  • Red Hat AMQ Broker 7
  • Red Hat Ansible Automation Platform 2
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Red Hat Hardened Images
  • Red Hat OpenShift AI (RHOAI)
  • Red Hat OpenShift Container Platform 4
  • Red Hat Openshift Data Foundation 4
  • Secrets Management Console for Red Hat OpenShift
  • Self-service automation portal 2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-18149
  2. 2026-10-03 Alias added: GHSA-pmjh-fq2x-6v4x
  3. 2026-10-27 Affected versions changed · Red Hat

References

Advisory 3

Other 6

  • 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