sync-rpc: Arbitrary remote code execution vulnerability

published 2026-07-03 4mo ago modified 2026-11-11 14h ago also GHSA-2x86-cf3f-86gw , EUVD-2026-123698

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository ForbesLindesay/sync-rpc. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss: 8.7; version 4.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: —; no EPSS score yet
public exploits: 0; none known

sync-rpc runs asynchronous commands synchronously by putting them in a separate proces. Prior to version 1.3.7, if an attacker could guess the correct port and it was not blocked via a firewall, it was possible to load and execute arbitrary JavaScript files stored on the server running sync-rpc. This issue has been patched in version 1.3.7.

Patch / fix

fixed in 1 links 1

npm sync-rpc 1.3.7

github.com/ForbesLindesay/sync-rpc@ffccfe5 commit

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CVSS scores

assigned by	version	score	vector
CNA	4.0	8.7	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CNA	4.0	8.7	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/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

Affected packages

ecosystem	package	affected	fixed in
npm	sync-rpc	<1.3.7	1.3.7

Affected products

ForbesLindesay sync-rpc

Classification

Weakness

CWE-306 Missing Authentication for Critical Functionality

References

Sources

CVE List CVE-2026-65843
NVD CVE-2026-65843
Maintainer advisory GHSA-2x86-cf3f-86gw

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of ForbesLindesay/sync-rpc published their own advisory on GitHub. Reviewed sources take precedence over it.