undici vulnerable to Denial of Service via unhandled error in WebSocket permessage-deflate decompression
Priority LOW 27CWE-248Published · 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, 17 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-248.
Summary
undici bundles a WebSocket client whose permessage-deflate size-limit cleanup removes all listeners from the internal zlib inflate stream, including its error listener, while that stream can still emit. When a remote peer sends a compressed payload that crosses the built-in 128 MiB decompressed-payload limit and then contains a malformed DEFLATE byte, the inflate stream emits a data error with no listener attached, which Node.js treats as a fatal unhandled error and terminates the entire process. Exploitation is remote and unauthenticated, requires no application mistake, and is asymmetric, since roughly 130 KB on the wire expands past the limit and crashes the process, and reconnecting can repeat the crash. This affects undici versions from 6.25.0 up to 6.28.1, from 7.28.0 up to 7.29.1, and from 8.1.0 up to 8.10.2. Users should upgrade to undici 6.28.1, 7.29.1, or 8.10.2.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00412 35th percentileScored 2026-11-07
Fix Partial undici (undici): 6.28.1, 7.29.1, 8.10.2undici (npm): 6.28.1, 7.29.1, 8.10.2Red Hat: 3 advisoriesRed Hat: 1 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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| NodeJS | undici | 6.25.0 to before 6.28.1; 7.28.0 to before 7.29.1; 8.1.0 to before 8.10.2 | 6.28.1, 7.29.1, 8.10.2 | Patch available | CNA |
| — | undici (npm) | 6.25.0 to before 6.28.1 | 6.28.1 | Patch available | GHSA-3wwx-pv8p-q78v |
| — | undici (npm) | 7.28.0 to before 7.29.1 | 7.29.1 | Patch available | GHSA-3wwx-pv8p-q78v |
| — | undici (npm) | 8.1.0 to before 8.10.2 | 8.10.2 | Patch available | GHSA-3wwx-pv8p-q78v |
- undici VendorNodeJS Affected 6.25.0 to before 6.28.1; 7.28.0 to before 7.29.1; 8.1.0 to before 8.10.2 Fixed in 6.28.1, 7.29.1, 8.10.2 Patch available CNA
- undici (npm) Vendor— Affected 6.25.0 to before 6.28.1 Fixed in 6.28.1 Patch available GHSA-3wwx-pv8p-q78v
- undici (npm) Vendor— Affected 7.28.0 to before 7.29.1 Fixed in 7.29.1 Patch available GHSA-3wwx-pv8p-q78v
- undici (npm) Vendor— Affected 8.1.0 to before 8.10.2 Fixed in 8.10.2 Patch available GHSA-3wwx-pv8p-q78v
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:* | 6.25.0 to before 6.28.1; 7.28.0 to before 7.29.1; 8.1.0 to before 8.10.2 | Vulnerable | NodeJS |
- cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:* Versions 6.25.0 to before 6.28.1; 7.28.0 to before 7.29.1; 8.1.0 to before 8.10.2 Vulnerable ·NodeJS
Remediation
- Fix · CNA undici (undici) Fixed in 6.28.1, 7.29.1, 8.10.2
- Fix · GHSA-3wwx-pv8p-q78v undici (npm) Fixed in 6.28.1 Advisory →
- Fix · GHSA-3wwx-pv8p-q78v undici (npm) Fixed in 7.29.1 Advisory →
- Fix · GHSA-3wwx-pv8p-q78v undici (npm) Fixed in 8.10.2 Advisory →
Red Hat 3 advisories
- RHSA-2026:71017 Released 2026-09-23 · Red Hat rating ImportantRed Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images nodejs24-1:24.21.0-1.hum1@aarch64, nodejs24-1:24.21.0-1.hum1@src, nodejs24-1:24.21.0-1.hum1@x86_64 +14
- RHSA-2026:66605 Released 2026-09-11 · Red Hat rating ImportantRed Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images nodejs26-1:26.8.2-0.1.hum1@aarch64, nodejs26-1:26.8.2-0.1.hum1@src, nodejs26-1:26.8.2-0.1.hum1@x86_64 +14
- RHSA-2026:63782 Released 2026-09-04 · Red Hat rating ImportantRed Hat Hardened Images RPMs Security Update
- Red Hat Hardened Images grafana12.4-12.4.9-0.6.hum1@aarch64, grafana12.4-12.4.9-0.6.hum1@src, grafana12.4-12.4.9-0.6.hum1@x86_64
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
undici 6.28.1, 7.29.1, 8.10.2
3 records Highest priority Priority LOW 3 LOW
Other records, highest priority first
- TI-2026-15892 undici vulnerable to Denial of Service via unrequested WebSocket subprotocolPriority LOW 39
- TI-2026-15206 undici vulnerable to downstream response splitting via retry interceptorPriority LOW 17
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Exploit Intelligence | Affected | No fix planned: Out of support scope |
| OpenShift Pipelines | Affected | No fix yet: Fix deferred |
| Red Hat AMQ Broker 7 | Affected | No fix yet: Fix deferred |
| Red Hat Ansible Automation Platform 2 | Affected | No fix yet: Fix deferred |
| Red Hat Build of Podman Desktop | Affected | No fix yet: Fix deferred |
| Red Hat Developer Hub 1 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat Hardened Images | Affected | No fix planned: Will not fix |
| Red Hat OpenShift AI (RHOAI) | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Dev Spaces | Affected | No fix yet: Fix deferred |
| Red Hat Openshift Data Foundation 4 | Affected | No fix yet: Fix deferred |
| Red Hat Trusted Artifact Signer | Affected | No fix planned: Out of support scope |
| Secrets Management Console for Red Hat OpenShift | Affected | No fix planned: Out of support scope |
| Self-service automation portal 2 | Affected | No fix yet: Fix deferred |
| Red Hat Hardened Images | Fixed | RHSA-2026:63782, RHSA-2026:66605, RHSA-2026:71017 |
Not affected: 1 product
- Red Hat Hardened Images
Timeline
- 2026-10-02 Threatist record created from CVE-2026-85024
- 2026-10-03 Alias added: GHSA-3wwx-pv8p-q78v
- 2026-10-27 Affected versions changed · Red Hat
References
Advisory 3
Other 7
- https://github.com/nodejs/undici/commit/07c60d9c7099a910451244afe42861bbdbdd974c
- https://github.com/nodejs/undici/commit/4411a238a98e8791da5fff10cc9e3578a7668ed6
- https://github.com/nodejs/undici/commit/63cf698b611fecc6ee0a17b185b930051e4b982f
- https://github.com/nodejs/undici
- https://github.com/nodejs/undici/releases/tag/v6.28.1
- https://github.com/nodejs/undici/releases/tag/v7.29.1
- https://github.com/nodejs/undici/releases/tag/v8.10.2
More NodeJS Undici vulnerabilities
- 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
Sources
- CVE-2026-85024 · CVE Program
- CVE-2026-85024 · NVD
- FIRST EPSS
- GHSA-3wwx-pv8p-q78v · GitHub Advisory Database · CC BY 4.0
- CVE-2026-85024 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences