CVE-2022-0323: Improper Neutralization of Special Elements Used in a Template Engine in Packagist mustache/mustache prior to

This month

HIGH 8.8UPGRADE

CVE-2022-0323 is a high-severity flaw (CVSS 8.8) affecting mustache. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper Neutralization of Special Elements Used in a Template Engine in Packagist mustache/mustache prior to 2.14.1.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-1336, CWE-94
Published	2022-01-21
Last modified	2026-06-17

Publisher (CNA): huntr.dev · Vendor: mustache project

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

Am I affected?

Timeline

2022-01-21 18:15 UTCPublished CVE record published
2026-06-17 04:20 UTCUpdated Record last modified

mustache project mustache UPGRADE

Affected: >= 2.0.0 and < 2.14.1

Fixed in: 2.14.1

Safe to downgrade to: a release before 2.0.0

1. Check installed version

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

2. UPGRADE to 2.14.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mustache

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 2.0.0 (Debian / Ubuntu)

apt-cache madison mustache sudo apt install mustache=<VERSION_BEFORE_2.0.0> sudo apt-mark hold mustache

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

dnf --showduplicates list mustache sudo dnf downgrade mustache-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add mustache

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-2022-0323?

mustache: upgrade to 2.14.1. Exact commands for each OS are on this page.

Is CVE-2022-0323 being exploited?

CVE-2022-0323 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-2022-0323 affect?

CVE-2022-0323 affects mustache. Severity is high (CVSS 8.8). Improper Neutralization of Special Elements Used in a Template Engine in Packagist mustache/mustache prior to 2.14.1.

How urgent is CVE-2022-0323?

Priority 49/100. High severity; Public exploit reference

References

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