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TI-2026-74993 Aliases CVE-2026-87029GHSA-55wc-3pg8-jfw6

Uncaught exception in undici decompress interceptor allows crashes

Priority LOW 32CWE-248Published · 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-248.

Summary

undici, an HTTP client library for Node.js, is affected from 7.15.0 before 7.30.1 and from 8.0.0 before 8.12.2 in the npm package. Its decompress interceptor does not catch exceptions that downstream handlers throw from zlib callbacks (CWE-248), which terminates the Node.js process. A malicious or compromised HTTP server can crash clients that combine the decompress interceptor with a throwing handler, such as the dump interceptor, by sending a small compressed body that expands past the configured size limit.

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 7.15.0 through 7.30.0 and 8.0.0 through 8.12.1, its decompress interceptor forwards decompressed response data to the downstream handler from zlib stream event callbacks without catching exceptions those callbacks may throw, and while undici's engine converts a synchronous throw from a downstream handler into a per-request failure, that protection is absent when the throw happens asynchronously from a zlib callback. As a result, a downstream handler that throws by design, such as the built-in dump interceptor which throws when a response exceeds its configured maximum size, escapes as an uncaught exception that terminates the Node.js process. A malicious or compromised HTTP server can crash any client that composes the decompress interceptor with such a handler by returning a small compressed body that decompresses to more than the configured limit, so only the decompressed size matters and the bytes on the wire stay tiny. The issue is fixed in undici 7.30.1 and 8.12.2, and users should upgrade to one of those versions or later. As a workaround, avoid composing the decompress interceptor with a response handler that throws during response processing until upgrading.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0026 17th percentileScored 2026-11-07
Fix Partial undici (undici): 7.30.1, 8.12.2undici (npm): 7.30.1, 8.12.2Red Hat: 3 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
NodeJSundici7.15.0 to before 7.30.1; 8.0.0 to before 8.12.27.30.1, 8.12.2Patch availableCNA
—undici (npm)7.15.0 to before 7.30.17.30.1Patch availableGHSA-55wc-3pg8-jfw6
—undici (npm)8.0.0 to before 8.12.28.12.2Patch availableGHSA-55wc-3pg8-jfw6
  • undici VendorNodeJS Affected 7.15.0 to before 7.30.1; 8.0.0 to before 8.12.2 Fixed in 7.30.1, 8.12.2 Patch available CNA
  • undici (npm) Vendor— Affected 7.15.0 to before 7.30.1 Fixed in 7.30.1 Patch available GHSA-55wc-3pg8-jfw6
  • undici (npm) Vendor— Affected 8.0.0 to before 8.12.2 Fixed in 8.12.2 Patch available GHSA-55wc-3pg8-jfw6

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*7.15.0 to before 7.30.1; 8.0.0 to before 8.12.2VulnerableNodeJS
  • cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:* Versions 7.15.0 to before 7.30.1; 8.0.0 to before 8.12.2 Vulnerable ·NodeJS

Remediation

Upgrade undici to 7.30.1 or 8.12.2 or later. Red Hat fixes this in RHSA-2026:84706 and RHSA-2026:84657 for Red Hat Hardened Images, and in RHSA-2026:95124 for Red Hat Trusted Artifact Signer 1.5. Red Hat lists these products as affected without a fix: Red Hat Enterprise Linux 8, 9 and 10, and other products. Until upgrading, avoid composing the decompress interceptor with a handler that throws during response processing.

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

  • Fix · CNA undici (undici) Fixed in 7.30.1, 8.12.2
  • Fix · GHSA-55wc-3pg8-jfw6 undici (npm) Fixed in 7.30.1 Advisory →
  • Fix · GHSA-55wc-3pg8-jfw6 undici (npm) Fixed in 8.12.2 Advisory →

Red Hat 3 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-2026:84706 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
  • 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 7.30.1, 8.12.2

    3 records Highest priority Priority MEDIUM 1 MEDIUM, 2 LOW

    Other records, highest priority first

    • TI-2026-74888 undici cache poisoning and cross-user disclosure via cross-origin redirectsPriority MEDIUM 40
    • TI-2026-74889 Subresource Integrity bypass in undici fetch via mixed-case tokensPriority LOW 32
    Show all 3 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
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-2026-87029
  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. 2026-10-27 Affected versions changed · Red Hat
  12. 2026-10-27 Alias added: GHSA-55wc-3pg8-jfw6
  13. 2026-10-30 Affected versions changed · Red Hat
  14. 2026-11-04 Fix available: RHSA-2026:95124 · Red Hat
  15. 2026-11-04 Fix available: Red Hat Trusted Artifact Signer 1.5 · Red Hat

References

Advisory 3

Other 5

  • 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