CVE-2026-4851: GRID::Machine versions through 0.127 for Perl allows arbitrary code execution via unsafe deserialization. GRI

Q: How do I fix CVE-2026-4851?

grid\: upgrade to newer than 0.127. Exact commands for each OS are on this page.

Q: Is CVE-2026-4851 being exploited?

CVE-2026-4851 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-4851 affect?

CVE-2026-4851 affects grid\. Severity is critical (CVSS 9.8). 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

Q: How urgent is CVE-2026-4851?

Priority 50/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-4851 is a critical-severity flaw (CVSS 9.8) affecting grid\. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-95, CWE-502
Published	2026-03-29
Last modified	2026-06-17

Publisher (CNA): CPANSec · Vendor: casiano

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-29 01:15 UTCPublished CVE record published
2026-06-17 10:57 UTCUpdated Record last modified

casiano grid\ UPGRADE

Affected: <= 0.127

Fixed in: newer than 0.127

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy grid || rpm -q grid || grid --version

2. UPGRADE to newer than 0.127 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade grid

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade grid

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-4851?

grid\: upgrade to newer than 0.127. Exact commands for each OS are on this page.

Is CVE-2026-4851 being exploited?

CVE-2026-4851 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-4851 affect?

CVE-2026-4851 affects grid\. Severity is critical (CVSS 9.8). 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

How urgent is CVE-2026-4851?

Priority 50/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Perl vulnerabilities

References

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