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CVE-2026-84890

undici vulnerable to Denial of Service via unbounded decompression of compressed responses

MEDIUM
5.9
CVSS Score
Published: September 4, 2026 at 05:04 PM UTC
Updated: September 11, 2026 at 05:10 PM UTC
2 products affected across 2 vendorsUndiciUndici

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Severity
MEDIUM5.9
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Undici· Node.jsnpm
95%
7.15.0 ≤ v < 7.29.18.0.0 ≤ v < 8.10.2
Affected range stops below 7.29.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.10.2, so it looks safe — our inference, not a vendor statement
Undici· Undici
60%
7.15.0 ≤ v < 7.29.18.0.0 ≤ v < 8.10.27.15.08.0.0
Vendor states this is fixed in 7.29.1 (unaffected)
Vendor states this is fixed in 8.10.2 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

MitigationVendor Advisory
Source: cverecord
https://github.com/nodejs/undici/security/advisories/GHSA-3xpg-4rpp-hhhm
Vendor Advisory
Source: cverecord
https://cna.openjsf.org/security-advisories.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.9MEDIUMopenjs
Vector?

Quick Info

StatusANALYZED
CWE
CWE-770

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