CVE-2026-84890undici vulnerable to Denial of Service via unbounded decompression of compressed responses
Updated under an hour ago ()
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It affects undici and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.9 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- openjs
- NVD analysis
- Analyzed
- Record last updated
- Sep 4, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
undici undici undici:undici (from the name) | from 7.15.0 before 7.29.1; 7.29.1 not affected; from 8.0.0 before 8.10.2; 8.10.2 not affected | CNA record |
nodejs undici nodejs:undici | from 7.15.0 before 7.29.1; from 8.0.0 before 8.10.2 | NVD |
References
- https://github.com/nodejs/undici/security/advisories/GHSA-3xpg-4rpp-hhhmmitigation, vendor-advisory
- https://cna.openjsf.org/security-advisories.htmlvendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.