How severe is CVE-2026-1528?

CVE-2026-1528 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-1528 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-1528?

CVE-2026-1528 affects Nodejs Undici. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-1528?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-1528 have an EU (EUVD) identifier?

Yes. CVE-2026-1528 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11703.

When was CVE-2026-1528 published?

CVE-2026-1528 was published on 2026-03-12 and last updated on 2026-07-02.

CVE-2026-1528

CVE-2026-1528 is a high-severity vulnerability in Nodejs Undici with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-248.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-11703
Weakness: CWE-248
Affected product: Nodejs Undici
Published: 2026-03-12
Last modified: 2026-07-02

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-1528?: CVE-2026-1528 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-1528 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-1528?: CVE-2026-1528 affects Nodejs Undici. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-1528?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-1528 have an EU (EUVD) identifier?: Yes. CVE-2026-1528 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11703.
When was CVE-2026-1528 published?: CVE-2026-1528 was published on 2026-03-12 and last updated on 2026-07-02.

References

Affected products (1)

cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*

More vulnerabilities in Nodejs Undici

CVE-2026-6734 — High (CVSS 7.5): Impact: When using Socks5ProxyAgent, undici reuses a single connection pool across different origins without verifying…
CVE-2026-9675 — High (CVSS 7.5): Impact: The undici WebSocket client enforces maxPayloadSize per-frame but does not enforce the cumulative size of…
CVE-2026-12151 — High (CVSS 7.5): Impact: The undici WebSocket client enforces maxPayloadSize on the cumulative byte count of fragments in a message but…
CVE-2026-2229 — High (CVSS 7.5): ImpactThe undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation of…
CVE-2026-1526 — High (CVSS 7.5): The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption during…
CVE-2023-24807 — High (CVSS 7.5): Undici is an HTTP/1.1 client for Node.js. Prior to version 5.19.1, the `Headers.set()` and `Headers.append()` methods…

All CVEs affecting Nodejs Undici →

Other CWE-248 vulnerabilities

CVE-2018-11466 — Critical (CVSS 9.8): A vulnerability has been identified in SINUMERIK 808D V4.7 (All versions), SINUMERIK 808D V4.8 (All versions),…
CVE-2024-42037 — Critical (CVSS 9.3): Vulnerability of uncaught exceptions in the Graphics module Impact: Successful exploitation of this vulnerability may…
CVE-2025-53620 — Critical (CVSS 9.2): @builder.io/qwik-city is the meta-framework for Qwik. When a Qwik Server Action QRL is executed it dynamically load the…
CVE-2026-46689 — High (CVSS 8.7): Kanidm is an identity management platform. Prior to version 1.9.3, a single unauthenticated GET to any /scim/v1/...…
CVE-2026-9509 — High (CVSS 8.7): An unhandled exception in Suprema BioStar 2 (Server), versions 2.9.8, 2.9.10, and 2.9.11, that allows an…
CVE-2025-9124 — High (CVSS 8.7): A denial-of-service security issue in the affected product. The security issue stems from a fault occurring when a…

Browse all CWE-248 vulnerabilities →