CVE-2025-27788: JSON is a JSON implementation for Ruby

Q: How do I fix CVE-2025-27788?

javascript object notation: upgrade to 2.10.2. Exact commands for each OS are on this page.

Q: Is CVE-2025-27788 being exploited?

CVE-2025-27788 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-2025-27788 affect?

CVE-2025-27788 affects javascript object notation. Severity is high (CVSS 7.5). JSON is a JSON implementation for Ruby. Starting in version 2.10.0 and prior to version 2.10.2, a specially crafted document could cause an out of bound read, most likely resulting in a crash. Versions prior to 2.10.0 are not vulnerable. Ve

Q: How urgent is CVE-2025-27788?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2025-27788 is a high-severity flaw (CVSS 7.5) affecting javascript object notation. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

JSON is a JSON implementation for Ruby. Starting in version 2.10.0 and prior to version 2.10.2, a specially crafted document could cause an out of bound read, most likely resulting in a crash. Versions prior to 2.10.0 are not vulnerable. Version 2.10.2 fixes the problem. No known workarounds are available.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-125
Published	2025-03-12
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: ruby-lang

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

Am I affected?

Timeline

2025-03-12 14:15 UTCPublished CVE record published
2026-06-17 09:04 UTCUpdated Record last modified

ruby-lang javascript object notation UPGRADE

Affected: >= 2.10.0 and < 2.10.2

Fixed in: 2.10.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy javascript-object-notation || rpm -q javascript-object-notation || javascript-object-notation --version

2. UPGRADE to 2.10.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade javascript-object-notation

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade javascript-object-notation

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-2025-27788?

javascript object notation: upgrade to 2.10.2. Exact commands for each OS are on this page.

Is CVE-2025-27788 being exploited?

CVE-2025-27788 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-2025-27788 affect?

CVE-2025-27788 affects javascript object notation. Severity is high (CVSS 7.5). JSON is a JSON implementation for Ruby. Starting in version 2.10.0 and prior to version 2.10.2, a specially crafted document could cause an out of bound read, most likely resulting in a crash. Versions prior to 2.10.0 are not vulnerable. Ve

How urgent is CVE-2025-27788?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

Software pages

Ruby vulnerabilities

References

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