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CVE-2026-33943

A flaw was found in Happy DOM, a JavaScript implementation of a web browser. This vulnerability allows a remote attacker to achieve Remote Code Execution (RCE) by injecting arbitrary JavaScript expressions. The `ECMAScriptModuleCompiler` component fails to properly sanitize content within `export { }` declarations in ES module scripts, leading to the direct execution of malicious code.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:3307ea081393c962770b9980d4c3473d9e48e8ec135c11b247a7c5613ca0222c
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 3 assertions

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift:4"],"defaultStatus":"affected","packageName":"openshift4/ose-agent-installer-ui-rhel9","product":"Red Hat OpenShift Container Platform 4","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0860fa0a3a2b3e0b739acbe3baa243afde7304ffd17d5ab97532f50d0ea947a · sha256:6b9afe30e8ea5e37… · /containers/adp/1/affected/1

{"product":"happy-dom","vendor":"capricorn86","versions":[{"status":"affected","version":">= 15.10.0, < 20.8.8"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0860fa0a3a2b3e0b739acbe3baa243afde7304ffd17d5ab97532f50d0ea947a · sha256:6b9afe30e8ea5e37… · /containers/cna/affected/0

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:ansible_automation_platform:2"],"defaultStatus":"unaffected","packageName":"ansible-automation-platform-26/gateway-rhel9","product":"Red Hat Ansible Automation Platform 2","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0860fa0a3a2b3e0b739acbe3baa243afde7304ffd17d5ab97532f50d0ea947a · sha256:6b9afe30e8ea5e37… · /containers/adp/1/affected/0
cwe · 2 assertions

{"cweId":"CWE-917","description":"Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a0860fa0a3a2b3e0b739acbe3baa243afde7304ffd17d5ab97532f50d0ea947a · sha256:6b9afe30e8ea5e37… · /containers/adp/1/problemTypes/0/descriptions/0

{"cweId":"CWE-94","description":"CWE-94: Improper Control of Generation of Code ('Code Injection')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a0860fa0a3a2b3e0b739acbe3baa243afde7304ffd17d5ab97532f50d0ea947a · sha256:6b9afe30e8ea5e37… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

3 source assertions
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift:4"],"defaultStatus":"affected","packageName":"openshift4/ose-agent-installer-ui-rhel9","product":"Red Hat OpenShift Container Platform 4","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0860fa0a3a2b3e0b739acbe3baa243afde7304ffd17d5ab97532f50d0ea947a · sha256:6b9afe30e8ea5e37… · /containers/adp/1/affected/1
{"product":"happy-dom","vendor":"capricorn86","versions":[{"status":"affected","version":">= 15.10.0, < 20.8.8"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0860fa0a3a2b3e0b739acbe3baa243afde7304ffd17d5ab97532f50d0ea947a · sha256:6b9afe30e8ea5e37… · /containers/cna/affected/0
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:ansible_automation_platform:2"],"defaultStatus":"unaffected","packageName":"ansible-automation-platform-26/gateway-rhel9","product":"Red Hat Ansible Automation Platform 2","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0860fa0a3a2b3e0b739acbe3baa243afde7304ffd17d5ab97532f50d0ea947a · sha256:6b9afe30e8ea5e37… · /containers/adp/1/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a0860fa0a3a2b3e0b739acbe3baa243afde7304ffd17d5ab97532f50d0ea947a · sha256:6b9afe30e8ea5e37… · /containers/adp/1/metrics/1/cvssV3_1
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a0860fa0a3a2b3e0b739acbe3baa243afde7304ffd17d5ab97532f50d0ea947a · sha256:6b9afe30e8ea5e37… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-917","description":"Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a0860fa0a3a2b3e0b739acbe3baa243afde7304ffd17d5ab97532f50d0ea947a · sha256:6b9afe30e8ea5e37… · /containers/adp/1/problemTypes/0/descriptions/0
{"cweId":"CWE-94","description":"CWE-94: Improper Control of Generation of Code ('Code Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a0860fa0a3a2b3e0b739acbe3baa243afde7304ffd17d5ab97532f50d0ea947a · sha256:6b9afe30e8ea5e37… · /containers/cna/problemTypes/0/descriptions/0

Source references

7 source assertions
{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-33943"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a0860fa0a3a2b3e0b739acbe3baa243afde7304ffd17d5ab97532f50d0ea947a · sha256:6b9afe30e8ea5e37… · /containers/adp/1/references/0
{"name":"RHBZ#2452522","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2452522"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a0860fa0a3a2b3e0b739acbe3baa243afde7304ffd17d5ab97532f50d0ea947a · sha256:6b9afe30e8ea5e37… · /containers/adp/1/references/1
{"name":"https://github.com/capricorn86/happy-dom/commit/5437fdf8f13adb9590f9f52616d9f69c3ee8db3c","tags":["x_refsource_MISC"],"url":"https://github.com/capricorn86/happy-dom/commit/5437fdf8f13adb9590f9f52616d9f69c3ee8db3c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a0860fa0a3a2b3e0b739acbe3baa243afde7304ffd17d5ab97532f50d0ea947a · sha256:6b9afe30e8ea5e37… · /containers/cna/references/1
{"name":"https://github.com/capricorn86/happy-dom/releases/tag/v20.8.8","tags":["x_refsource_MISC"],"url":"https://github.com/capricorn86/happy-dom/releases/tag/v20.8.8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a0860fa0a3a2b3e0b739acbe3baa243afde7304ffd17d5ab97532f50d0ea947a · sha256:6b9afe30e8ea5e37… · /containers/cna/references/2
{"name":"https://github.com/capricorn86/happy-dom/security/advisories/GHSA-6q6h-j7hj-3r64","tags":["x_refsource_CONFIRM"],"url":"https://github.com/capricorn86/happy-dom/security/advisories/GHSA-6q6h-j7hj-3r64"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a0860fa0a3a2b3e0b739acbe3baa243afde7304ffd17d5ab97532f50d0ea947a · sha256:6b9afe30e8ea5e37… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/capricorn86/happy-dom/security/advisories/GHSA-6q6h-j7hj-3r64"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a0860fa0a3a2b3e0b739acbe3baa243afde7304ffd17d5ab97532f50d0ea947a · sha256:6b9afe30e8ea5e37… · /containers/adp/0/references/0
{"tags":["x_sadp-csaf-vex"],"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33943.json"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a0860fa0a3a2b3e0b739acbe3baa243afde7304ffd17d5ab97532f50d0ea947a · sha256:6b9afe30e8ea5e37… · /containers/adp/1/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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