CVE-2022-40320: cfg_tilde_expand in confuse.c in libConfuse 3.3 has a heap-based buffer over-read.

This month

HIGH 8.8DOWNGRADEMITIGATE

CVE-2022-40320 is a high-severity flaw (CVSS 8.8) affecting libconfuse, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

cfg_tilde_expand in confuse.c in libConfuse 3.3 has a heap-based buffer over-read.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-125
Published	2022-09-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: fedoraproject · libconfuse project

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

Am I affected?

Timeline

2022-09-09 21:15 UTCPublished CVE record published
2026-06-17 05:01 UTCUpdated Record last modified

libconfuse project libconfuse DOWNGRADE

Affected: 3.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.3 (Debian / Ubuntu)

apt-cache madison libconfuse sudo apt install libconfuse=<VERSION_BEFORE_3.3> sudo apt-mark hold libconfuse

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

dnf --showduplicates list libconfuse sudo dnf downgrade libconfuse-<VERSION_BEFORE_3.3> sudo dnf versionlock add libconfuse

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.

fedoraproject fedora MITIGATE

Affected: 35 · 36 · 37

Fixed in: no fixed release known

Safe to downgrade to: a release before 35

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2022-40320?

libconfuse: downgrade or apply the listed mitigation; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-40320 being exploited?

CVE-2022-40320 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-2022-40320 affect?

CVE-2022-40320 affects libconfuse, fedora. Severity is high (CVSS 8.8). cfg_tilde_expand in confuse.c in libConfuse 3.3 has a heap-based buffer over-read.

How urgent is CVE-2022-40320?

Priority 54/100. High severity; Public exploit reference

References

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