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    CVE-2026-1528

    ImpactA server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici's ByteParser overflows internal math, ends up in an invalid state, and throws a fatal TypeError that terminates the process. Patches Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.

    Published:Mar 12, 2026
    Last Modified:Mar 23, 2026
    EPS:Mar 12, 2026
    EPSS Score:0.00128
    CVSS Score:7.5

    Affected Products

    Vendor
    Nodejs
    Product
    Undici
    Vendor
    Undici
    Product
    Undici

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-9697 (CVSS 7.4) — Impact: undici's ProxyAgent silently drops the requestTls option when configured with a SOCKS5 proxy URI (sock…
    CVE-2026-6734 (CVSS 7.5) — Impact: When using Socks5ProxyAgent, undici reuses a single connection pool across different origins without v…
    CVE-2026-12151 (CVSS 7.5) — Impact: The undici WebSocket client enforces maxPayloadSize on the cumulative byte count of fragments in a mes…
    CVE-2026-2229 (CVSS 7.5) — ImpactThe undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation of th…
    CVE-2026-1527 (CVSS 4.6) — ImpactWhen an application passes user-controlled input to the upgrade option of client.request(), an attacker …
    CVE-2026-2581 (CVSS 5.9) — This is an uncontrolled resource consumption vulnerability (CWE-400) that can lead to Denial of Service (DoS).…
    CVE-2026-1526 (CVSS 7.5) — The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption durin…
    CVE-2026-1525 (CVSS 6.5) — Undici allows duplicate HTTP Content-Length headers when they are provided in an array with case-variant names…
    CVE-2026-22036 (CVSS 5.9) — Undici is an HTTP/1.1 client for Node.js. Prior to 7.18.0 and 6.23.0, the number of links in the decompression…
    CVE-2025-47279 (CVSS 3.1) — Undici is an HTTP/1.1 client for Node.js. Prior to versions 5.29.0, 6.21.2, and 7.5.0, applications that use u…

    References

    https://cna.openjsf.org/security-advisories.html
    https://github.com/nodejs/undici/security/advisories/GHSA-f269-vfmq-vjvj
    https://hackerone.com/reports/3537648
    https://access.redhat.com/errata/RHSA-2026:13826
    https://access.redhat.com/errata/RHSA-2026:17789
    https://access.redhat.com/errata/RHSA-2026:21772
    https://access.redhat.com/errata/RHSA-2026:21931
    https://access.redhat.com/errata/RHSA-2026:34342
    https://access.redhat.com/errata/RHSA-2026:5807
    https://access.redhat.com/errata/RHSA-2026:7080
    https://access.redhat.com/errata/RHSA-2026:7123
    https://access.redhat.com/errata/RHSA-2026:7302
    https://access.redhat.com/errata/RHSA-2026:7310
    https://access.redhat.com/errata/RHSA-2026:7350
    https://access.redhat.com/errata/RHSA-2026:7670
    https://access.redhat.com/errata/RHSA-2026:7675
    https://access.redhat.com/errata/RHSA-2026:7983
    https://access.redhat.com/errata/RHSA-2026:9742
    https://access.redhat.com/security/cve/CVE-2026-1528
    https://bugzilla.redhat.com/show_bug.cgi?id=2447145
    https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1528.json

    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