CVE-2022-45491: Buffer overflow vulnerability in function json_parse_value in sheredom json.h before commit 0825301a07cbf51653

Q: How do I fix CVE-2022-45491?

json.h: upgrade to 2022-11-14. Exact commands for each OS are on this page.

Q: Is CVE-2022-45491 being exploited?

CVE-2022-45491 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-2022-45491 affect?

CVE-2022-45491 affects json.h. Severity is high (CVSS 7.8). Buffer overflow vulnerability in function json_parse_value in sheredom json.h before commit 0825301a07cbf51653882bf2b153cc81fdadf41 (November 14, 2022) allows attackers to code arbitrary code and gain escalated privileges.

Routine

HIGH 7.8UPGRADE

CVE-2022-45491 is a high-severity flaw (CVSS 7.8) affecting json.h. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow vulnerability in function json_parse_value in sheredom json.h before commit 0825301a07cbf51653882bf2b153cc81fdadf41 (November 14, 2022) allows attackers to code arbitrary code and gain escalated privileges.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 82%)
CISA exploited list	No
Weakness	CWE-787, CWE-122
Published	2023-02-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: json.h 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 21:15 UTCPublished CVE record published
2026-06-17 05:10 UTCUpdated Record last modified

json.h project json.h UPGRADE

Affected: < 2022-11-14

Fixed in: 2022-11-14

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy json.h || rpm -q json.h || json.h --version

2. UPGRADE to 2022-11-14 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade json.h

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade json.h

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-2022-45491?

json.h: upgrade to 2022-11-14. Exact commands for each OS are on this page.

Is CVE-2022-45491 being exploited?

CVE-2022-45491 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-2022-45491 affect?

CVE-2022-45491 affects json.h. Severity is high (CVSS 7.8). Buffer overflow vulnerability in function json_parse_value in sheredom json.h before commit 0825301a07cbf51653882bf2b153cc81fdadf41 (November 14, 2022) allows attackers to code arbitrary code and gain escalated privileges.

How urgent is CVE-2022-45491?

Priority 32/100. High severity

Related CVEs

CVE-2022-45496 HIGH 7.8 UPGRADE Buffer overflow vulnerability in function json_parse_string in sheredom json.h before commit 0825301a07cbf5165
CVE-2022-45493 HIGH 7.8 UPGRADE Buffer overflow vulnerability in function json_parse_key in sheredom json.h before commit 0825301a07cbf5165388
CVE-2022-45492 HIGH 7.8 UPGRADE Buffer overflow vulnerability in function json_parse_number in sheredom json.h before commit 0825301a07cbf5165

References

← Back to latest CVEs