CVE-2022-30123: A sequence injection vulnerability exists in Rack <2.0.9.1, <2.1.4.1 and <2.2.3.1 which could allow is a possi

Q: How urgent is CVE-2022-30123?

Priority 65/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

This week

CRITICAL 10.0REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2022-30123 is a critical-severity flaw (CVSS 10.0) affecting rack, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A sequence injection vulnerability exists in Rack <2.0.9.1, <2.1.4.1 and <2.2.3.1 which could allow is a possible shell escape in the Lint and CommonLogger components of Rack.

Why this priority

Critical severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.0% (top 20%)
CISA exploited list	No
Weakness	CWE-150
Published	2022-12-05
Last modified	2026-06-17

Publisher (CNA): HackerOne · Vendor: debian · rack project

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

Am I affected?

Timeline

2022-12-05 22:15 UTCPublished CVE record published
2026-06-17 04:43 UTCUpdated Record last modified

rack project rack UPGRADE

Affected: < 2.0.9.1 · >= 2.1.0 and < 2.1.4.1 · >= 2.2.0 and < 2.2.3.1

Fixed in: 2.0.9.1, 2.1.4.1, 2.2.3.1

Safe to downgrade to: a release before 2.1.0

1. Check installed version

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

2. UPGRADE to 2.0.9.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade rack

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 2.1.0 (Debian / Ubuntu)

apt-cache madison rack sudo apt install rack=<VERSION_BEFORE_2.1.0> sudo apt-mark hold rack

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

dnf --showduplicates list rack sudo dnf downgrade rack-<VERSION_BEFORE_2.1.0> sudo dnf versionlock add rack

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.

debian debian linux MITIGATE

Affected: 11.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.0

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-2022-30123?

rack: upgrade to 2.0.9.1, 2.1.4.1, 2.2.3.1; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-30123 being exploited?

CVE-2022-30123 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-2022-30123 affect?

CVE-2022-30123 affects rack, debian linux. Severity is critical (CVSS 10.0). A sequence injection vulnerability exists in Rack <2.0.9.1, <2.1.4.1 and <2.2.3.1 which could allow is a possible shell escape in the Lint and CommonLogger components of Rack.

How urgent is CVE-2022-30123?

Priority 65/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Debian vulnerabilities

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References

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