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undici CVE-2026-84890

| EUVDEUVD-2026-71634 MEDIUM
Allocation of Resources Without Limits or Throttling (CWE-770)
2026-09-04 openjs
Denial Of Service Red Hat Undici Suse
5.9
CVSS 3.1 · Vendor: openjs
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Severity by source

Vendor (openjs) PRIMARY
5.9 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
5.9 MEDIUM

Requires attacker-controlled upstream server (AC:H); no client-side auth needed; purely availability impact with no confidentiality or integrity compromise.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Red Hat
5.9 MEDIUM
qualitative

Primary rating from Vendor (openjs).

CVSS VectorVendor: openjs

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Patch available
Sep 04, 2026 - 19:18 EUVD
Analysis Generated
Sep 04, 2026 - 18:01 vuln.today
CVE Published
Sep 04, 2026 - 17:04 cve.org
MEDIUM 5.9

DescriptionCVE.org

undici's decompress interceptor decompresses response bodies according to the untrusted Content-Encoding header. While the number of content-encoding layers is capped, the total decompressed output size is unbounded and there is no configuration option to limit it. A malicious or faulty upstream can therefore return a small compressed payload, a compression bomb, that expands to hundreds of megabytes or more in client memory, an asymmetric resource consumption that can exhaust memory and crash the process. This affects undici versions from 7.15.0 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.

AnalysisAI

Memory exhaustion via compression bomb in undici's decompress interceptor (versions 7.15.0-<7.29.1 and 8.0.0-<8.10.2) allows a malicious or compromised upstream HTTP server to crash a Node.js process by returning a small compressed payload that expands to hundreds of megabytes in client heap memory. The interceptor respects the untrusted Content-Encoding header and enforces no ceiling on total decompressed output size, making the attack purely asymmetric - a kilobyte-scale upstream payload can trigger unbounded client-side allocation. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation The decompress interceptor must be in use, which requires undici version 7.15.0 or later (the feature was introduced in that release). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 5.9 vector (AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H) is well-calibrated: the availability impact is High, but AC:H correctly acknowledges that a malicious or compromised upstream server is a prerequisite - the attacker must be positioned to control or intercept what the undici client connects to, which limits opportunistic mass exploitation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade undici to version 7.29.1 (7.x branch) or 8.10.2 (8.x branch), the fixed releases confirmed by the OpenJS Foundation advisory GHSA-3xpg-4rpp-hhhm at https://github.com/nodejs/undici/security/advisories/GHSA-3xpg-4rpp-hhhm. … Detailed patch versions, workarounds, and compensating controls in full report.
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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise High Performance Computing 12 Affected
SUSE Linux Enterprise Module for Python 3 15 SP7 Not-Affected
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Affected
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Affected

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CVE-2026-84890 vulnerability details – vuln.today
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