CVE-2026-33937

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 2.3%, top 19% 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, secondary
Trending — 3 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 9.8Exploit: Elevated riskExposed: 0

A fix is available — apply it.

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, Handlebars.compile() accepts a pre-parsed AST object in addition to a template string. The value field of a NumberLiteral AST node is emitted directly into the generated JavaScript without quoting or sanitization. An attacker who can supply a crafted AST to compile() can therefore inject and execute arbitrary JavaScript, leading to Remote Code Execution on the server. Version 4.7.9 fixes the issue. Some workarounds are available. Validate input type before calling Handlebars.compile(); ensure the argument is always a string, never a plain object or JSON-deserialized value. Use the Handlebars runtime-only build (handlebars/runtime) on the server if templates are pre-compiled at build time; compile() will be unavailable.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

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%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
2%
EPSS %ILE
82%
KEV
Not listed

Published

March 27, 2026

Last Modified

July 15, 2026

Advisory Details (8)

Auto-updated Aug 15, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github, redhat.
redhat Patch Available

Affected: Red Hat Enterprise Linux 10",

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33937.json
redhat Patch Available

2452523 – (CVE-2026-33937) CVE-2026-33937 handlebars.js: Handlebars: Remote Code Execution via crafted Abstract Syntax Tree object in compile()

https://bugzilla.redhat.com/show_bug.cgi?id=2452523
redhat Patch Available

CVE-2026-33937 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-33937
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:34342
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:10175
github Patch Available🟡 PoC Available

JavaScript Injection via AST Type Confusion in compile · Advisory · handlebars-lang/handlebars.js · GitHub

https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-2w6w-674q-4c4q
github_release Patch Available

v4.7.9

Patch available: handlebars-lang/handlebars.js v4.7.9

https://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.9
github_commit Patch Available

commit 68d8df5a88e0 (handlebars-lang/handlebars.js)

Patch available: handlebars-lang/handlebars.js v4.7.9 (contains commit 68d8df5a88e0)

https://github.com/handlebars-lang/handlebars.js/commit/68d8df5a88e0a26fe9e6084c5c6aaebe67b07da2

Vendor Advisories for CVE-2026-33937(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatcluster-observability-operator/troubleshooting-panel-console-plugin-pf6-rhel9:17828399962026-07-01redhat
redhatdevspaces/code-rhel9:17767441102026-04-23redhat

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

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
node-handlebars3:4.7.6+~4.1.0-2 ... 3:4.7.9-5 (8 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
node-handlebars3:4.7.7+~4.1.0-1 ... 3:4.7.9-5 (6 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
node-handlebars3:4.7.7+~4.1.0-1 ... 3:4.7.9-5 (6 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
node-handlebars3:4.7.7+~4.1.0-13:4.7.9-1—
npm(1)
PackageVulnerable rangeFixed inDependents
handlebars—4.7.9—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 78× 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.

Showing the most recent 100 of 108 total refreshes for this CVE.

  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 22:55 UTCEPSS rescore
  3. 2026-08-19 17:03 UTCEPSS rescore
  4. 2026-08-18 13:48 UTCEPSS rescore
  5. 2026-08-17 13:47 UTCEPSS rescore
  6. 2026-08-16 14:56 UTCEPSS rescore
  7. 2026-08-16 09:56 UTCEG score recompute
  8. 2026-08-16 09:56 UTCVendor advisory
  9. 2026-08-16 02:14 UTCEPSS rescore
  10. 2026-08-15 01:30 UTCEPSS rescore
  11. 2026-08-14 23:20 UTCVendor advisory
  12. 2026-08-14 19:11 UTCVendor advisory
  13. 2026-08-14 14:32 UTCVendor advisory
  14. 2026-08-14 10:24 UTCVendor advisory
  15. 2026-08-14 06:15 UTCEG score recompute
  16. 2026-08-14 06:15 UTCVendor advisory
  17. 2026-08-13 22:00 UTCEPSS rescore
  18. 2026-08-13 04:51 UTCVendor advisory
  19. 2026-08-13 00:42 UTCVendor advisory
  20. 2026-08-12 20:33 UTCEG score recompute
  21. 2026-08-12 20:33 UTCVendor advisory
  22. 2026-08-12 13:50 UTCEPSS rescore
  23. 2026-08-12 00:51 UTCVendor advisory
  24. 2026-08-11 20:43 UTCEG score recompute
  25. 2026-08-11 20:43 UTCVendor advisory
Show 75 more
  1. 2026-08-11 07:52 UTCVendor advisory
  2. 2026-08-11 03:44 UTCEG score recompute
  3. 2026-08-11 03:44 UTCVendor advisory
  4. 2026-08-11 00:00 UTCEPSS rescore
  5. 2026-08-10 09:48 UTCVendor advisory
  6. 2026-08-10 05:40 UTCVendor advisory
  7. 2026-08-10 01:31 UTCVendor advisory
  8. 2026-08-09 21:21 UTCVendor advisory
  9. 2026-08-09 17:12 UTCEG score recompute
  10. 2026-08-09 17:12 UTCVendor advisory
  11. 2026-08-09 13:46 UTCEPSS rescore
  12. 2026-08-09 13:04 UTCVendor advisory
  13. 2026-08-09 05:48 UTCEG score recompute
  14. 2026-08-09 05:48 UTCVendor advisory
  15. 2026-08-08 16:37 UTCEPSS rescore
  16. 2026-08-08 08:49 UTCVendor advisory
  17. 2026-08-08 04:40 UTCVendor advisory
  18. 2026-08-08 00:32 UTCVendor advisory
  19. 2026-08-07 20:23 UTCEG score recompute
  20. 2026-08-07 20:23 UTCVendor advisory
  21. 2026-08-07 16:15 UTCVendor advisory
  22. 2026-08-06 18:39 UTCEG score recompute
  23. 2026-08-06 18:39 UTCVendor advisory
  24. 2026-08-06 13:46 UTCEPSS rescore
  25. 2026-08-06 09:03 UTCVendor advisory
  26. 2026-08-06 04:53 UTCVendor advisory
  27. 2026-08-06 00:44 UTCEG score recompute
  28. 2026-08-06 00:44 UTCVendor advisory
  29. 2026-08-05 19:17 UTCEPSS rescore
  30. 2026-08-04 15:10 UTCEPSS rescore
  31. 2026-08-04 10:38 UTCEPSS rescore
  32. 2026-08-04 03:56 UTCVendor advisory
  33. 2026-08-03 23:06 UTCEG score recompute
  34. 2026-08-03 23:06 UTCVendor advisory
  35. 2026-08-03 10:36 UTCEPSS rescore
  36. 2026-08-02 23:26 UTCVendor advisory
  37. 2026-08-02 19:17 UTCVendor advisory
  38. 2026-08-02 15:09 UTCEG score recompute
  39. 2026-08-02 15:09 UTCVendor advisory
  40. 2026-08-02 02:27 UTCEPSS rescore
  41. 2026-08-01 04:16 UTCEPSS rescore
  42. 2026-07-30 16:28 UTCEPSS rescore
  43. 2026-07-30 01:30 UTCEPSS rescore
  44. 2026-07-27 14:13 UTCEPSS rescore
  45. 2026-07-26 14:54 UTCEPSS rescore
  46. 2026-07-26 14:54 UTCEPSS rescore
  47. 2026-07-25 14:18 UTCEPSS rescore
  48. 2026-07-25 14:18 UTCEPSS rescore
  49. 2026-07-24 14:17 UTCEPSS rescore
  50. 2026-07-24 14:17 UTCEPSS rescore
  51. 2026-07-23 14:18 UTCEPSS rescore
  52. 2026-07-23 14:18 UTCEPSS rescore
  53. 2026-07-23 03:09 UTCEG score recompute
  54. 2026-07-22 14:08 UTCEPSS rescore
  55. 2026-07-21 15:24 UTCEPSS rescore
  56. 2026-07-20 17:08 UTCEPSS rescore
  57. 2026-07-19 14:31 UTCEPSS rescore
  58. 2026-07-19 02:29 UTCEPSS rescore
  59. 2026-07-18 10:04 UTCEPSS rescore
  60. 2026-07-18 06:59 UTCOSV refresh
  61. 2026-07-16 17:03 UTCEPSS rescore
  62. 2026-07-15 16:57 UTCEPSS rescore
  63. 2026-07-15 16:57 UTCEPSS rescore
  64. 2026-07-15 02:00 UTCEPSS rescore
  65. 2026-07-13 22:30 UTCEPSS rescore
  66. 2026-07-13 06:13 UTCEPSS rescore
  67. 2026-07-13 06:13 UTCEPSS rescore
  68. 2026-07-12 05:46 UTCEPSS rescore
  69. 2026-07-11 08:27 UTCEPSS rescore
  70. 2026-07-09 19:10 UTCEPSS rescore
  71. 2026-07-08 15:15 UTCEPSS rescore
  72. 2026-07-07 13:46 UTCEPSS rescore
  73. 2026-07-06 16:27 UTCEPSS rescore
  74. 2026-07-06 16:27 UTCEPSS rescore
  75. 2026-07-06 02:23 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-33937?
CVE-2026-33937 is a critical vulnerability published on March 27, 2026. Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, Handlebars.compile() accepts a pre-parsed AST object in addition to a template string. The value field of a NumberLiteral AST node is emitted directly into the generated JavaScript…
When was CVE-2026-33937 disclosed?
CVE-2026-33937 was first published in the National Vulnerability Database on March 27, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33937 actively exploited?
CVE-2026-33937 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 18.4% of all scored CVEs.
What is the CVSS score of CVE-2026-33937?
CVE-2026-33937 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-33937?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33937, 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

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