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.
No analysis available yet.
Remediation
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Tracking
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Advisories
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References
History
Fri, 04 Sep 2026 17:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | undici vulnerable to Denial of Service via unbounded decompression of compressed responses | |
| Weaknesses | CWE-770 | |
| References |
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| Metrics |
cvssV3_1
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Subscriptions
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Status: PUBLISHED
Assigner: openjs
Published:
Updated: 2026-09-04T18:33:28.246Z
Reserved: 2026-09-02T14:36:25.597Z
Link: CVE-2026-84890
No data.
Status : Received
Published: 2026-09-04T18:18:01.633
Modified: 2026-09-04T18:18:01.633
Link: CVE-2026-84890
No data.
OpenCVE Enrichment
No data.
Weaknesses
-
CWE-770
Allocation of Resources Without Limits or Throttling