CVE-2026-87029
Description
A flaw was found in undici. A remote malicious or compromised HTTP server can cause a Denial of Service (DoS) by sending a small compressed response that decompresses beyond configured size limits. Because undici fails to catch errors triggered by response handlers during decompression, an unhandled exception is produced that crashes the client application.
Statement
This vulnerability is rated as Moderate impact because successful exploitation requires an application to connect to an untrusted or compromised HTTP server and utilize a specific client interceptor configuration. A denial of service condition only occurs when the decompression interceptor is composed with a downstream handler that throws errors upon receiving oversized responses. Standard Red Hat environments that connect exclusively to trusted endpoints or run default HTTP pipelines without this specific combination of interceptors are not susceptible to this failure.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.9 | 7.5 | 5.9 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | High | Low | High |
| Privileges Required | None | None | None |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | None | None | None |
| Integrity Impact | None | None | None |
| Availability Impact | High | High | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
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