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Public proof of conceptFix available

CVE-2022-29221

A public proof of concept exists; no exploitation attested.

  • Published2022-05-24
  • WeaknessCWE-94

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Smarty is a template engine for PHP, facilitating the separation of presentation (HTML/CSS) from application logic. Prior to versions 3.1.45 and 4.1.1, template authors could inject php code by choosing a malicious {block} name or {include} file name. Sites that cannot fully trust template authors should upgrade to versions 3.1.45 or 4.1.1 to receive a patch for this issue. There are currently no known workarounds.

Timeline

dates in UTC
  1. 2022-05-2415:15CVE publishedNVD
  2. 2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2022-29221?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2022-29221?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Debian debian linux
BranchAffectedFixed in
9.0= 9.0no fix published
10.0= 10.0no fix published
11.0= 11.0no fix published
Fedoraproject fedora
BranchAffectedFixed in
36.x= 36no fix published
37.x= 37no fix published
Smarty
BranchAffectedFixed in
4.x≥ 4.0.0, < 4.1.14.1.1
3.1< 3.1.453.1.45

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

Detection

read 2026-10-23 19:23 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedsbani/CVE-2022-29221-PoC
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionnone2025-04-23
  • OpenCVESSVC decisionnone—
  • CNACVSS 3.18.8read 2026-10-23
  • NVDCVSS 3.18.8read 2026-10-23
  • NVDCVSS 2.06.5read 2026-10-23
  • CNAweakness (CWE)CWE-94read 2026-10-23
  • NVDweakness (CWE)CWE-94read 2026-10-23
  • FIRST EPSSEPSS score4.9 %2026-10-22
  • PoC-in-GitHubproof of concept1read 2026-10-23

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2022-05-24
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2022-29221?

Smarty is a template engine for PHP, facilitating the separation of presentation (HTML/CSS) from application logic. Prior to versions 3.1.45 and 4.1.1, template authors could inject php code by choosing a malicious {block} name or {include} file name. Sites that cannot fully trust template authors should upgrade to versions 3.1.45 or 4.1.1 to receive a patch for this issue. There are currently no known workarounds.

Is CVE-2022-29221 actively exploited?

Active exploitation of CVE-2022-29221 has not been confirmed. Its EPSS score was 4.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2022-29221?

CVE-2022-29221 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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