CVE-2026-84890

    Dashboard / Vulnerabilities / CVE-2026-84890

    CVE-2026-84890

    Published: 4 Sept 2026Last Modified: 13 Sept 2026

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

    Details: 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.

    References: https://cna.openjsf.org/security-advisories.html, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84890.json, https://github.com/nodejs/undici/security/advisories/GHSA-3xpg-4rpp-hhhm, https://nvd.nist.gov/vuln/detail/CVE-2026-84890

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 7ddbdb8a34a1e8e73972c30ac54fd144a69160f4
    Fixed -d39a83e7b0d631590c3b85b5cc0dbeab66c3a1d8

    Affected versions

    v8.10.1
    v8.10.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-84890 | CVE-DB