Asynchronous Command Execution Vulnerability in sync-rpc by Forbes Lindesay
CVE-2026-65843

8.7HIGH

Key Information:

Vendor

Forbeslindesay

Status
Sync-rpc
Vendor
CVE Published:
11 November 2026

What is CVE-2026-65843?

The sync-rpc library, prior to version 1.3.7, is susceptible to a vulnerability that allows attackers to execute arbitrary JavaScript files on the server. This occurs when the sync-rpc processes commands asynchronously but fails to adequately protect the port from unauthorized access. If the port is guessed and not secured by a firewall, an attacker can exploit this flaw to execute malicious scripts stored on the server. The issue has been addressed in the patched version, 1.3.7.

Affected Version(s)

sync-rpc < 1.3.7

References

https://github.com/ForbesLindesay/sync-rpc/security/advis...
x_refsource_CONFIRM
https://github.com/ForbesLindesay/sync-rpc/commit/ffccfe5...
x_refsource_MISC

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.