CVE-2022-29221 — Smarty is a template engine for PHP, facilitating the separation of presentation

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 trus

01What is this vulnerability?

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…

02Affected products

Vendor	Product	Versions
smarty-php	smarty	< 3.1.45, >= 4.0.0, < 4.1.1

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2022-05-24T00:00:00.000Z
• Last modified: 2025-04-23T18:22:54.999Z

09References

• github.com — https://github.com/smarty-php/smarty/security/advisories/GHSA-634x-pc3q-cf4c
• github.com — https://github.com/smarty-php/smarty/commit/64ad6442ca1da31cefdab5c9874262b702cc…
• github.com — https://github.com/smarty-php/smarty/releases/tag/v3.1.45
• github.com — https://github.com/smarty-php/smarty/releases/tag/v4.1.1
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2022/05/msg00044.html
• www.debian.org — https://www.debian.org/security/2022/dsa-5151
• security.gentoo.org — https://security.gentoo.org/glsa/202209-09
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…