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01 Record

CVE-2026-3419

Fastify's Missing End Anchor in "subtypeNameReg" Allows Malformed Content-Types to Pass Validation

MediumPUBLISHEDCNA: openjs
CNA base score5.3 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
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02 Description

Fastify's Missing End Anchor in "subtypeNameReg" Allows Malformed Content-Types to Pass Validation

03 Exploitation and scoring

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.
  • 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
0.36% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 30.1% of scored records. A rank, not a probability.
NVD base score
5.3 (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:N/I:L/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.

04 Metadata

Published
2026-03-06 17:50Z7 MO AGO
Last updated
2026-03-09 14:55Z7 MO AGO
Reserved
2026-03-01
Assigning CNA
openjs
Record state
PUBLISHED
Severity
Medium (CVSS 5.3)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weaknesses
  • CWE-185Incorrect Regular ExpressionClass
  • CWE-625Permissive Regular ExpressionBase
Data version
5.2
Document digest
94f607a2db493322fefe1764e435f77d6a69600a6884a9002943b18d335dd3bd

05 Affected products

VendorProductVersionsPlatforms
fastifyfastify5.7.2 to < 5.8.1—

06 References