CVE-2026-3635

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• 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

0.16% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 5.2% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. 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

2026-03-23 13:53Z7 MO AGO

Last updated

2026-03-23 15:30Z7 MO AGO

Reserved

2026-03-06

Assigning CNA

openjs

Record state

PUBLISHED

Severity

Medium (CVSS 6.1)

CNA CVSS vector

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

Weaknesses

• CWE-348Use of Less Trusted SourceBase

Data version

5.2

Document digest

3ebc558ef058a204bd0280873475c8b96b2b950d64022a0dd7194cd7a52dde7e

• github.comhttps://github.com/fastify/fastify/security/advisories/GHSA-444r-cwp2-x5xf
• www.cve.orghttps://www.cve.org/CVERecord?id=CVE-2026-3635
• cna.openjsf.orghttps://cna.openjsf.org/security-advisories.html