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CVE-2026-1528— undici is vulnerable to Malicious WebSocket 64-bit length overflows undici parser and crashes the client

Quick assessment

Affected
undici undici
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

undici是Node.js开源的一个HTTP/1.1客户端。 undici存在安全漏洞，该漏洞源于ByteParser在处理使用64位长度格式且长度极大的WebSocket帧时内部数学运算溢出，可能导致进程因致命TypeError而终止。

CVSS 7.5 · High EPSS 0.49% · P40

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
undici undici >= 6.0.0 < 6.24.0; 7.0.0 < 7.24.0 affected
6.24.0: 7.24.0 unaffected
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I. Basic Information for CVE-2026-1528

Vulnerability Information
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Vulnerability Title
undici is vulnerable to Malicious WebSocket 64-bit length overflows undici parser and crashes the client
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5
Vulnerability Title
undici 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
undici是Node.js开源的一个HTTP/1.1客户端。 undici存在安全漏洞，该漏洞源于ByteParser在处理使用64位长度格式且长度极大的WebSocket帧时内部数学运算溢出，可能导致进程因致命TypeError而终止。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
undici undici >= 6.0.0 < 6.24.0; 7.0.0 < 7.24.0 -

II. Public POCs for CVE-2026-1528

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III. Intelligence Information for CVE-2026-1528

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Vendor Advisories for CVE-2026-1528 (1)

Same Patch Batch · undici · 2026-03-12 · 6 CVEs total

CVE-2026-1526 7.5 HIGH undici is vulnerable to Unbounded Memory Consumption in undici WebSocket permessage-deflat
CVE-2026-2229 7.5 HIGH undici is vulnerable to Unhandled Exception in undici WebSocket Client Due to Invalid serv
CVE-2026-1525 6.5 MEDIUM undici is vulnerable to Inconsistent Interpretation of HTTP Requests ('HTTP Request/Respon
CVE-2026-2581 5.9 MEDIUM undici is vulnerable to Unbounded Memory Consumption in in Undici's DeduplicationHandler v
CVE-2026-1527 4.6 MEDIUM undici is vulnerable to CRLF Injection via upgrade option

IV. Related Vulnerabilities

Same product: undici
Same vendor: undici
Same weakness: CWE-248

V. Comments for CVE-2026-1528

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