CVE-2023-23086: Buffer OverFlow Vulnerability in MojoJson v1.2.3 allows an attacker to execute arbitrary code via the SkipStri

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2023-23086 is a critical-severity flaw (CVSS 9.8) affecting mojojson. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer OverFlow Vulnerability in MojoJson v1.2.3 allows an attacker to execute arbitrary code via the SkipString function.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 39%)
CISA exploited list	No
Weakness	CWE-787
Published	2023-02-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mojojson project

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

Am I affected?

Timeline

2023-02-03 18:15 UTCPublished CVE record published
2026-06-17 05:36 UTCUpdated Record last modified

mojojson project mojojson DOWNGRADE

Affected: 1.2.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.2.3 (Debian / Ubuntu)

apt-cache madison mojojson sudo apt install mojojson=<VERSION_BEFORE_1.2.3> sudo apt-mark hold mojojson

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mojojson sudo dnf downgrade mojojson-<VERSION_BEFORE_1.2.3> sudo dnf versionlock add mojojson

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2023-23086?

mojojson: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-23086 being exploited?

CVE-2023-23086 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-2023-23086 affect?

CVE-2023-23086 affects mojojson. Severity is critical (CVSS 9.8). Buffer OverFlow Vulnerability in MojoJson v1.2.3 allows an attacker to execute arbitrary code via the SkipString function.

How urgent is CVE-2023-23086?

Priority 60/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-23087 CRITICAL 9.8 DOWNGRADE An issue was found in MojoJson v1.2.3 allows attackers to execute arbitary code via the destroy function.

References

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