CVE-2021-26120

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 82.3%, top 0% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this weekElevated
9.8
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 82%
CISA-KEV: Not listedEPSS: 82%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

Smarty before 3.1.39 allows code injection via an unexpected function name after a {function name= substring.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
82(Track*)
EG Risk 82/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation82% × 40%
Automatability30% × 15%
Action: Watch closely — could escalate to Attend.
EPSS
99.6%
KEV
Not listed

Published

February 22, 2021

Last Modified

November 21, 2024

Advisory Details (5)

Auto-updated Jun 22, 2026
Patch available.
generic

[SECURITY] [DSA 5151-1] smarty3 security update

https://www.debian.org/security/2022/dsa-5151
generic

Smarty: Multiple vulnerabilities (GLSA 202105-06) — Gentoo security

https://security.gentoo.org/glsa/202105-06
generic Patch Available

[SECURITY] [DLA 2618-2] smarty3 regression update

https://lists.debian.org/debian-lts-announce/2021/04/msg00014.html
generic Patch Available

[SECURITY] [DLA 2618-1] smarty3 security update

https://lists.debian.org/debian-lts-announce/2021/04/msg00004.html
generic

smarty/CHANGELOG.md at master · smarty-php/smarty · GitHub

https://github.com/smarty-php/smarty/blob/master/CHANGELOG.md

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntusmarty3 (3.1.31+20161214.1.c7d42e4+selfpack1-3ubuntu0.1) @ bionic2026-05-26ubuntu
ubuntusmarty3 (3.1.21-1ubuntu1+esm1) @ xenial2026-05-26ubuntu
ubuntusmarty3 (3.1.34+20190228.1.c9f0de05+selfpack1-1ubuntu0.1~esm1) @ focal2026-05-26ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
smarty/smartyv2.6.24 ... v3.1.38 (37 versions)3.1.39—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(3)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× in last 7d / 23× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-24 14:15 UTCEPSS rescore
  2. 2026-07-23 01:58 UTCEG score recompute
  3. 2026-07-22 22:45 UTCEG score recompute
  4. 2026-07-22 14:06 UTCEPSS rescore
  5. 2026-07-22 14:06 UTCEPSS rescore
  6. 2026-07-21 15:22 UTCEPSS rescore
  7. 2026-07-21 15:22 UTCEPSS rescore
  8. 2026-07-20 17:05 UTCEPSS rescore
  9. 2026-07-19 01:29 UTCOSV refresh
  10. 2026-07-15 16:55 UTCEPSS rescore
  11. 2026-07-15 16:55 UTCEPSS rescore
  12. 2026-07-15 01:58 UTCEPSS rescore
  13. 2026-07-11 08:25 UTCEPSS rescore
  14. 2026-07-11 08:25 UTCEPSS rescore
  15. 2026-07-08 15:12 UTCEPSS rescore
  16. 2026-07-04 06:29 UTCEPSS rescore
  17. 2026-07-04 06:29 UTCEPSS rescore
  18. 2026-07-01 15:03 UTCEPSS rescore
  19. 2026-07-01 08:18 UTCOSV refresh
  20. 2026-06-28 04:54 UTCEPSS rescore
  21. 2026-06-28 04:54 UTCEPSS rescore
  22. 2026-06-25 13:48 UTCEPSS rescore
  23. 2026-06-25 13:48 UTCEPSS rescore
  24. 2026-06-23 21:31 UTCEPSS rescore
  25. 2026-06-23 21:31 UTCEPSS rescore
Show 37 more
  1. 2026-06-21 14:55 UTCEPSS rescore
  2. 2026-06-21 14:54 UTCEPSS rescore
  3. 2026-06-21 01:58 UTCEPSS rescore
  4. 2026-06-21 01:58 UTCEPSS rescore
  5. 2026-06-16 17:51 UTCEPSS rescore
  6. 2026-06-15 17:46 UTCEPSS rescore
  7. 2026-06-14 23:15 UTCEPSS rescore
  8. 2026-06-13 22:58 UTCEPSS rescore
  9. 2026-06-13 22:58 UTCEPSS rescore
  10. 2026-06-13 13:13 UTCOSV refresh
  11. 2026-06-12 23:10 UTCEPSS rescore
  12. 2026-06-11 13:58 UTCEPSS rescore
  13. 2026-06-10 22:16 UTCEPSS rescore
  14. 2026-06-10 13:20 UTCEPSS rescore
  15. 2026-06-08 14:15 UTCEPSS rescore
  16. 2026-06-07 15:23 UTCEPSS rescore
  17. 2026-06-07 15:23 UTCEPSS rescore
  18. 2026-06-06 13:46 UTCEPSS rescore
  19. 2026-06-06 13:46 UTCEPSS rescore
  20. 2026-06-06 13:46 UTCEPSS rescore
  21. 2026-06-05 22:45 UTCEPSS rescore
  22. 2026-06-05 22:45 UTCEPSS rescore
  23. 2026-06-05 06:09 UTCEPSS rescore
  24. 2026-06-05 06:09 UTCEPSS rescore
  25. 2026-06-02 20:11 UTCEPSS rescore
  26. 2026-06-02 20:11 UTCEPSS rescore
  27. 2026-06-02 20:11 UTCEPSS rescore
  28. 2026-06-01 13:50 UTCEPSS rescore
  29. 2026-06-01 13:50 UTCEPSS rescore
  30. 2026-05-31 00:15 UTCEPSS rescore
  31. 2026-05-29 13:42 UTCEPSS rescore
  32. 2026-05-28 13:43 UTCEPSS rescore
  33. 2026-05-28 13:43 UTCEPSS rescore
  34. 2026-05-26 20:36 UTCEG score recompute
  35. 2026-05-26 20:36 UTCVendor advisory
  36. 2026-05-26 07:17 UTCEPSS rescore
  37. 2026-05-26 07:17 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2021-26120?
CVE-2021-26120 is a critical vulnerability published on February 22, 2021. Smarty before 3.1.39 allows code injection via an unexpected function name after a {function name= substring.
When was CVE-2021-26120 disclosed?
CVE-2021-26120 was first published in the National Vulnerability Database on February 22, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-26120 actively exploited?
CVE-2021-26120 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-26120?
CVE-2021-26120 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-26120?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-26120, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-26120

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