7.5

CVE-2026-45736: ws: Uninitialized memory disclosure

Modified
AliasesUBUNTU-CVE-2026-45736DEBIAN-CVE-2026-45736CGA-2392-9rrp-v2r5
Published 15-05-2026Last modified 11-09-2026

Vulnerability summary

CVE-2026-45736 is a high (CVSS 7.5) Use of Uninitialized Resource vulnerability in websockets ws. EPSS estimates a 0.74% chance of exploitation in the next 30 days, higher than 54.8% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Routine

Not severe (CVSS 4.4, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.74%
0%100%
Low · +0.07 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 7 · Related 3
OPENSUSE-SU-2026:11705-1OPENSUSE-SU-2026:21849-1RHSA-2026:26638RHSA-2026:26994RHSA-2026:27171RHSA-2026:57590

Timeline

  1. 15-05-2026
    PublishedVulnerability first disclosed.
  2. 11-09-2026
    Last modifiedVulnerability information updated.

Description

ws is an open source WebSocket client and server for Node.js. Prior to 8.20.1, the websocket.close() implementation is vulnerable to uninitialized memory disclosure when a TypedArray is passed as the reason argument. This vulnerability is fixed in 8.20.1.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.74%

Chance of exploitation in the next 30 days

Percentile

55%

Versus all other CVEs

30-day change

Increase +0.07 pp

From 0.68% 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

1 found
  • githubUnverified

    Ws

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Version check

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

Chainguard84 products
  • airflow-2All versions (No fix recorded)
  • airflow-core-2All versions (No fix recorded)
  • arangodb-3.11< 3.11.14.4-r12
  • arangodb-3.12< 3.12.9.4-r11
  • argo-workflows-ui-3.6< 3.6.19-r7
Wolfi21 products
  • argo-workflows-ui-3.7< 3.7.14-r4
  • code-server< 4.121.0-r0
  • jupyter-base-notebook< 7.6.3-r2
  • katib-earlystopping< 0.19.0-r31
  • katib-suggestion-goptuna-compatAll versions (No fix recorded)
Debian1 product
  • node-wsAll versions (No fix recorded) | < 8.20.1+~cs14.19.1-1
Npm1 product
  • ws≥ 8.0.0, < 8.20.1
Opensuse1 product
  • zcode&distro=openSUSE Tumbleweed< 3.14.3-1.1
Ubuntu1 product
  • node-wsAll versions (No fix recorded)
Websockets1 product
  • ws≥ 8.0.0, < 8.20.1
Ws_project1 product
  • ws≥ 8.0.0, < 8.20.1

8 vendors · 111 products

References

39 links
Show all 39 references