CVE-2026-33943

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.79% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 53.6% of scored records. A rank, not a probability.

NVD base score

9.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-07-15.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-03-27 21:15Z5 MO AGO

Last updated

2026-07-15 01:05Z1 MO AGO

Reserved

2026-03-24

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 8.8)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weaknesses

• CWE-94Improper Control of Generation of Code ('Code Injection')Base
• CWE-917Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')Base

Data version

5.2

Document digest

6b9afe30e8ea5e3761dac342fac323ad9d80120fdc6f171a697cfe34a363db44

• github.comhttps://github.com/capricorn86/happy-dom/security/advisories/GHSA-6q6h-j7hj-3r64x_refsource_CONFIRM
• github.comhttps://github.com/capricorn86/happy-dom/commit/5437fdf8f13adb9590f9f52616d9f69c3ee8db3cx_refsource_MISC
• github.comhttps://github.com/capricorn86/happy-dom/releases/tag/v20.8.8x_refsource_MISC
• access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-33943vdb-entryx_refsource_REDHAT
• bugzilla.redhat.comRHBZ#2452522https://bugzilla.redhat.com/show_bug.cgi?id=2452522issue-trackingx_refsource_REDHAT
• security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33943.jsonx_sadp-csaf-vex