CVE-2026-34226

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.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited 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

0.46% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 37.8% of scored records. A rank, not a probability.

NVD base score

7.5 (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:N/A:N

NVD analysis status

Modified. NVD last modified this record on 2026-08-19.

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 21:17Z5 MO AGO

Last updated

2026-07-15 01:04Z1 MO AGO

Reserved

2026-03-26

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

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

Weaknesses

• CWE-201Insertion of Sensitive Information Into Sent DataBase
• CWE-359Exposure of Private Personal Information to an Unauthorized ActorBase

Data version

5.2

Document digest

bb7245a303daffc6f3e163e92304b8816ecb585ba8432e325869ad1b1272d535

• github.comhttps://github.com/capricorn86/happy-dom/security/advisories/GHSA-w4gp-fjgq-3q4gx_refsource_CONFIRM
• github.comhttps://github.com/capricorn86/happy-dom/pull/2117x_refsource_MISC
• github.comhttps://github.com/capricorn86/happy-dom/commit/68324c21d7b98f53f7bb5a7b3e185bda7106e751x_refsource_MISC
• github.comhttps://github.com/capricorn86/happy-dom/blob/f8d8cad41e9722fab9eefb9dfb3cca696462e908/packages/happy-dom/src/fetch/utilities/FetchRequestHeaderUtility.tsx_refsource_MISC
• github.comhttps://github.com/capricorn86/happy-dom/releases/tag/v20.8.9x_refsource_MISC
• access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-34226vdb-entryx_refsource_REDHAT
• bugzilla.redhat.comRHBZ#2452519https://bugzilla.redhat.com/show_bug.cgi?id=2452519issue-trackingx_refsource_REDHAT
• security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34226.jsonx_sadp-csaf-vex