Withdrawn: this CVE is not a vulnerability
The assigning CNA withdrew CVE-2026-62389 on 29 July 2026, and it carries the Rejected state at CVE.org and NVD. It must not be treated as a live finding. Its pre-withdrawal severity, score and exploitability are withheld below; the record itself is kept because withdrawals are reversible and because the reject reason is the correction worth publishing.
CVE-2026-62389
ws < 8.21.1 Default maxFragments Allows Memory Exhaustion DoS
Description
Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority as a duplicate of CVE-2026-48779.
INFO
Published Date :
July 15, 2026, 6:16 p.m.
Last Modified :
July 29, 2026, 6:16 p.m.
Remotely Exploit :
—
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-62389
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-62389 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-62389 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Rejected by [email protected]
Jul. 29, 2026
Action Type Old Value New Value -
CVE Modified by [email protected]
Jul. 29, 2026
Action Type Old Value New Value Changed Description ws before 8.21.1 contains a memory exhaustion vulnerability in lib/receiver.js where the fragment guard only triggers when fragment count reaches maxFragments, allowing attackers to exhaust memory by sending incomplete fragmented WebSocket messages. Attackers can send a text frame with FIN=0 followed by continuation frames without completing the sequence, causing each fragment to be stored as a separate Buffer object with significant overhead, enabling denial of service through heap exhaustion. Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority as a duplicate of CVE-2026-48779. Removed CVSS V4.0 VulnCheck: AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Removed CVSS V3.1 VulnCheck: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Removed CWE VulnCheck: CWE-770 Removed Reference VulnCheck: https://github.com/websockets/ws/commit/f197ac65140920bdcecdab74bfc69c2d7858e55d Removed Reference VulnCheck: https://github.com/websockets/ws/issues/2331 Removed Reference VulnCheck: https://github.com/websockets/ws/releases/tag/8.21.1 Removed Reference VulnCheck: https://www.vulncheck.com/advisories/ws-default-maxfragments-allows-memory-exhaustion-dos Removed Affected [{'repo': 'https://github.com/websockets/ws', 'vendor': 'websockets', 'product': 'ws', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '8.21.1', 'versionType': 'semver'}], 'packageURL': 'pkg:npm/ws', 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 15, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-62389', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-15T17:55:24.792464Z'} -
New CVE Received by [email protected]
Jul. 15, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/websockets/ws', 'vendor': 'websockets', 'product': 'ws', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '8.21.1', 'versionType': 'semver'}], 'packageURL': 'pkg:npm/ws', 'defaultStatus': 'unaffected'}] Added Description ws before 8.21.1 contains a memory exhaustion vulnerability in lib/receiver.js where the fragment guard only triggers when fragment count reaches maxFragments, allowing attackers to exhaust memory by sending incomplete fragmented WebSocket messages. Attackers can send a text frame with FIN=0 followed by continuation frames without completing the sequence, causing each fragment to be stored as a separate Buffer object with significant overhead, enabling denial of service through heap exhaustion. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-770 Added Reference https://github.com/websockets/ws/commit/f197ac65140920bdcecdab74bfc69c2d7858e55d Added Reference https://github.com/websockets/ws/issues/2331 Added Reference https://github.com/websockets/ws/releases/tag/8.21.1 Added Reference https://www.vulncheck.com/advisories/ws-default-maxfragments-allows-memory-exhaustion-dos