Vulnerability Description
GRID::Machine versions through 0.127 for Perl allows arbitrary code execution via unsafe deserialization. GRID::Machine provides Remote Procedure Calls (RPC) over SSH for Perl. The client connects to remote hosts to execute code on them. A compromised or malicious remote host can execute arbitrary code back on the client through unsafe deserialization in the RPC protocol. read_operation() in lib/GRID/Machine/Message.pm deserialises values from the remote side using eval() $arg .= '$VAR1'; my $val = eval "no strict; $arg"; # line 40-41 $arg is raw bytes from the protocol pipe. A compromised remote host can embed arbitrary perl in the Dumper-formatted response: $VAR1 = do { system("..."); }; This executes on the client silently on every RPC call, as the return values remain correct. This functionality is by design but the trust requirement for the remote host is not documented in the distribution.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Casiano | Grid\ | <= 0.127, \ |
Related Weaknesses (CWE)
References
- https://www.openwall.com/lists/oss-security/2026/03/26/6Mailing List
- http://www.openwall.com/lists/oss-security/2026/03/26/6Mailing List
FAQ
What is CVE-2026-4851?
CVE-2026-4851 is a vulnerability with a CVSS score of 9.8 (CRITICAL). GRID::Machine versions through 0.127 for Perl allows arbitrary code execution via unsafe deserialization. GRID::Machine provides Remote Procedure Calls (RPC) over SSH for Perl. The client connects to...
How severe is CVE-2026-4851?
CVE-2026-4851 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-4851?
Check the references section above for vendor advisories and patch information. Affected products include: Casiano Grid\.