CVE-2022-23459: Jsonxx or Json++ is a JSON parser, writer and reader written in C++

This month

HIGH 8.1REMOTEDOWNGRADE

CVE-2022-23459 is a high-severity flaw (CVSS 8.1) affecting json\+\+. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Jsonxx or Json++ is a JSON parser, writer and reader written in C++. In affected versions of jsonxx use of the Value class may lead to memory corruption via a double free or via a use after free. The value class has a default assignment operator which may be used with pointer types which may point to alterable data where the pointer itself is not updated. This issue exists on the current commit of the jsonxx project. The project itself has been a

Why this priority

High severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-415, CWE-416
Published	2022-08-19
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: hjiang

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

Am I affected?

Timeline

2022-08-19 19:15 UTCPublished CVE record published
2026-06-17 04:30 UTCUpdated Record last modified

hjiang json\+\+ DOWNGRADE

Affected: 1.0.0 · 1.0.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0

1. Check installed version

apt-cache policy json++ || rpm -q json++ || json++ --version

2. No fixed release: DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison json++ sudo apt install json++=<VERSION_BEFORE_1.0.0> sudo apt-mark hold json++

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

dnf --showduplicates list json++ sudo dnf downgrade json++-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add json++

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-2022-23459?

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

Is CVE-2022-23459 being exploited?

CVE-2022-23459 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-2022-23459 affect?

CVE-2022-23459 affects json\+\+. Severity is high (CVSS 8.1). Jsonxx or Json++ is a JSON parser, writer and reader written in C++. In affected versions of jsonxx use of the Value class may lead to memory corruption via a double free or via a use after free. The value class has a default assignment ope

How urgent is CVE-2022-23459?

Priority 49/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-23460 MEDIUM 5.9 DOWNGRADE Jsonxx or Json++ is a JSON parser, writer and reader written in C++

References

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