7.5

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

Modified
AliasesUBUNTU-CVE-2026-1528DEBIAN-CVE-2026-1528CGA-2m42-6vrj-q33f
Published 12-03-2026Last modified 14-09-2026

Vulnerability summary

CVE-2026-1528 is a high (CVSS 7.5) Uncaught Exception vulnerability in nodejs undici. EPSS estimates a 0.51% chance of exploitation in the next 30 days, higher than 43.4% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.51%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 8 · Related 1
RHSA-2026:7080RHSA-2026:7123RHSA-2026:7302RHSA-2026:7310RHSA-2026:7350RHSA-2026:7670

Timeline

  1. 12-03-2026
    PublishedVulnerability first disclosed.
  2. 14-09-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.51%

Chance of exploitation in the next 30 days

Percentile

43%

Versus all other CVEs

30-day change

Increase +0.02 pp

From 0.49% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard28 products
  • code-server< 4.110.1-r2
  • gemini-cli< 0.49.0-r4
  • jitsucom-jitsu-console< 2.11.0-r17
  • jitsucom-jitsu-rotor< 2.11.0-r17
  • kibana-8.17< 8.17.10-r13
Wolfi5 products
  • code-server< 4.110.1-r2
  • jitsucom-jitsu-console< 2.11.0-r17
  • jitsucom-jitsu-rotor< 2.11.0-r17
  • langfuse-3-worker< 3.179.1-r1
  • renovate< 43.84.0-r1
Debian1 product
  • node-undiciAll versions (No fix recorded) | < 7.24.5+dfsg+~cs3.2.0-1
Nodejs1 product
  • undici< 6.24.0 | ≥ 7.0.0, < 7.24.0
Npm1 product
  • undici≥ 6.0.0, < 6.24.0 | ≥ 7.0.0, < 7.24.0
Ubuntu1 product
  • node-undiciAll versions (No fix recorded)
Undici1 product
  • undici≥ 6.0.0 < 6.24.0; 7.0.0 < 7.24.0 (No fix recorded)

7 vendors · 38 products

References

28 links
Show all 28 references