Allocation of Resources Without Limits or Throttling in undici - CVE-2026-84890
Published: September 6, 2026
Vulnerability identifier: #VU147179
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-84890
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to allocation of resources without limits or throttling in the interceptors.decompress() interceptor when decompressing HTTP response bodies according to an untrusted Content-Encoding header. A remote attacker can return a compression bomb as a compressed HTTP response to cause a denial of service.
Exploitation requires an application to use the decompress interceptor to read responses from an untrusted or compromised upstream.
Affected software
undici
How to mitigate CVE-2026-84890
Install security update from vendor's website.
undici - addressed in versions 7.29.1, 8.10.2