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Vulnerability details: VCID-cxf4-xmgb-aue5
Vulnerability ID VCID-cxf4-xmgb-aue5
Aliases CVE-2026-33939
GHSA-9cx6-37pm-9jff
Summary handlebars.js: Handlebars.js: Denial of Service via malformed decorator syntax in template compilation
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-248 Uncaught Exception
CWE-754 Improper Check for Unusual or Exceptional Conditions
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33939.json
epss 0.00076 https://api.first.org/data/v1/epss?cve=CVE-2026-33939
epss 0.00076 https://api.first.org/data/v1/epss?cve=CVE-2026-33939
cvssv3.1 7.5 https://github.com/handlebars-lang/handlebars.js
generic_textual HIGH https://github.com/handlebars-lang/handlebars.js
cvssv3.1 7.5 https://github.com/handlebars-lang/handlebars.js/commit/68d8df5a88e0a26fe9e6084c5c6aaebe67b07da2
generic_textual HIGH https://github.com/handlebars-lang/handlebars.js/commit/68d8df5a88e0a26fe9e6084c5c6aaebe67b07da2
ssvc Track https://github.com/handlebars-lang/handlebars.js/commit/68d8df5a88e0a26fe9e6084c5c6aaebe67b07da2
cvssv3.1 7.5 https://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.9
generic_textual HIGH https://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.9
ssvc Track https://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.9
cvssv3.1 7.5 https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-9cx6-37pm-9jff
generic_textual HIGH https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-9cx6-37pm-9jff
ssvc Track https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-9cx6-37pm-9jff
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2026-33939
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2026-33939
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33939.json
https://api.first.org/data/v1/epss?cve=CVE-2026-33939
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-33939
https://github.com/handlebars-lang/handlebars.js
https://github.com/handlebars-lang/handlebars.js/commit/68d8df5a88e0a26fe9e6084c5c6aaebe67b07da2
https://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.9
https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-9cx6-37pm-9jff
https://nvd.nist.gov/vuln/detail/CVE-2026-33939
1132141 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1132141
2452508 https://bugzilla.redhat.com/show_bug.cgi?id=2452508
GHSA-9cx6-37pm-9jff https://github.com/advisories/GHSA-9cx6-37pm-9jff
RHSA-2026:10175 https://access.redhat.com/errata/RHSA-2026:10175
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33939.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/handlebars-lang/handlebars.js
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/handlebars-lang/handlebars.js/commit/68d8df5a88e0a26fe9e6084c5c6aaebe67b07da2
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-03-30T18:52:18Z/ Found at https://github.com/handlebars-lang/handlebars.js/commit/68d8df5a88e0a26fe9e6084c5c6aaebe67b07da2
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.9
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-03-30T18:52:18Z/ Found at https://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.9
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-9cx6-37pm-9jff
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-03-30T18:52:18Z/ Found at https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-9cx6-37pm-9jff
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2026-33939
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.22975
EPSS Score 0.00076
Published At June 5, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T16:31:58.771346+00:00 RedHat Importer Import https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33939.json 38.6.0