CVE-2022-45145: egg-compile.scm in CHICKEN 5.x before 5.3.1 allows arbitrary OS command execution during package installation

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2022-45145 is a critical-severity flaw (CVSS 9.8) affecting chicken. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

egg-compile.scm in CHICKEN 5.x before 5.3.1 allows arbitrary OS command execution during package installation via escape characters in a .egg file.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-78
Published	2022-12-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: call-cc

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

Am I affected?

Timeline

2022-12-10 16:15 UTCPublished CVE record published
2026-06-17 05:09 UTCUpdated Record last modified

call-cc chicken UPGRADE

Affected: >= 5.0.0 and < 5.3.1

Fixed in: 5.3.1

Safe to downgrade to: a release before 5.0.0

1. Check installed version

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

2. UPGRADE to 5.3.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade chicken

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade chicken

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 5.0.0 (Debian / Ubuntu)

apt-cache madison chicken sudo apt install chicken=<VERSION_BEFORE_5.0.0> sudo apt-mark hold chicken

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list chicken sudo dnf downgrade chicken-<VERSION_BEFORE_5.0.0> sudo dnf versionlock add chicken

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-2022-45145?

chicken: upgrade to 5.3.1. Exact commands for each OS are on this page.

Is CVE-2022-45145 being exploited?

CVE-2022-45145 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-2022-45145 affect?

CVE-2022-45145 affects chicken. Severity is critical (CVSS 9.8). egg-compile.scm in CHICKEN 5.x before 5.3.1 allows arbitrary OS command execution during package installation via escape characters in a .egg file.

How urgent is CVE-2022-45145?

Priority 57/100. Critical severity; Remotely exploitable, no login, no user action

References

← Back to latest CVEs