[ CVE-2026-84890 · Published 4 Sep 2026 ]
undici vulnerable to Denial of Service via unbounded decompression of compressed responses
[ Description ]Official description
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.
[ Fixes ]Fixes and patches
- undici 7.29.1Fixed version · GitHub Advisories · npm package undici: upgrade to 7.29.1 or later (affected >= 7.15.0, < 7.29.1)
- undici 8.10.2Fixed version · GitHub Advisories · npm package undici: upgrade to 8.10.2 or later (affected >= 8.0.0, < 8.10.2)
[ Advisories ]Government CERT advisories
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CERT-FRCERTFR-2026-AVI-1336
Multiple vulnerabilities in IBM products Translated from French
Multiple vulnerabilities have been discovered in IBM products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and remote denial of service.
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BSI CERT-BundWID-SEC-2026-3596
IBM App Connect Enterprise: Multiple vulnerabilities Translated from German
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CERT-FRCERTFR-2026-AVI-1233
Multiple vulnerabilities in IBM products Translated from French
Multiple vulnerabilities have been discovered in IBM products. Some of them allow an attacker to cause remote arbitrary code execution, remote denial of service and a breach of data confidentiality.
[ Packages ]Affected open-source packages
- undici npmAffected >= 7.15.0, < 7.29.1 · fixed in 7.29.1 · GHSA-3xpg-4rpp-hhhm
- undici npmAffected >= 8.0.0, < 8.10.2 · fixed in 8.10.2 · GHSA-3xpg-4rpp-hhhm