CVE-2021-41170: neoan3-apps/template is a neoan3 minimal template engine

Q: How do I fix CVE-2021-41170?

neoan3-template: upgrade to 1.1.1. Exact commands for each OS are on this page.

Q: Is CVE-2021-41170 being exploited?

CVE-2021-41170 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-2021-41170 affect?

CVE-2021-41170 affects neoan3-template. Severity is critical (CVSS 9.8). neoan3-apps/template is a neoan3 minimal template engine. Versions prior to 1.1.1 have allowed for passing in closures directly into the template engine. As a result values that are callable are executed by the template engine. The issue ar

Q: How urgent is CVE-2021-41170?

Priority 58/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2021-41170 is a critical-severity flaw (CVSS 9.8) affecting neoan3-template. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

neoan3-apps/template is a neoan3 minimal template engine. Versions prior to 1.1.1 have allowed for passing in closures directly into the template engine. As a result values that are callable are executed by the template engine. The issue arises if a value has the same name as a method or function in scope and can therefore be executed either by mistake or maliciously. In theory all users of the package are affected as long as they either deal wit

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	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-74, CWE-277, CWE-732
Published	2021-11-08
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: neoan

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

Am I affected?

Timeline

2021-11-08 19:15 UTCPublished CVE record published
2026-06-17 04:08 UTCUpdated Record last modified

neoan neoan3-template UPGRADE

Affected: < 1.1.1

Fixed in: 1.1.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy neoan3-template || rpm -q neoan3-template || neoan3-template --version

2. UPGRADE to 1.1.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade neoan3-template

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade neoan3-template

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-2021-41170?

neoan3-template: upgrade to 1.1.1. Exact commands for each OS are on this page.

Is CVE-2021-41170 being exploited?

CVE-2021-41170 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-2021-41170 affect?

CVE-2021-41170 affects neoan3-template. Severity is critical (CVSS 9.8). neoan3-apps/template is a neoan3 minimal template engine. Versions prior to 1.1.1 have allowed for passing in closures directly into the template engine. As a result values that are callable are executed by the template engine. The issue ar

How urgent is CVE-2021-41170?

Priority 58/100. Critical severity; Remotely exploitable, no login, no user action

References

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