PT-2026-33000 · Npm · Fastify

Climba03003 + 4 · CVE-2026-33806 · Published 2025-04-18 · Updated 2026-04-15

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:C/A:N

Name of the Vulnerable Software and Affected Versions fastify versions 5.3.2 through 5.8.4

Description Applications using schema.body.content for per-content-type body validation are subject to a validation bypass. By prepending a space to the Content-Type header, the body is still parsed correctly, but the schema validation is skipped entirely.

Recommendations Upgrade to version 5.8.5 or later.

Exploit

Fix

Weakness Enumeration

CWE-1287

CWE-1289

Related Identifiers

BDU:2026-09015

CVE-2026-33806

GHSA-247C-9743-5963

GHSA-MG2H-6X62-WPWC

Affected Products

Fastify

References · 21

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33806.json · Exploit
• https://cna.openjsf.org/security-advisories.html · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-247c-9743-5963 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-mg2h-6x62-wpwc · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-33806 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33806 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-32442 · Security Note
• https://bdu.fstec.ru/vul/2026-09015 · Security Note
• https://github.com/fastify/fastify/security/advisories/GHSA-mg2h-6x62-wpwc · Note
• https://github.com/fastify/fastify · Note
• https://github.com/fastify/fastify/security/advisories/GHSA-247c-9743-5963 · Note
• https://github.com/fastify/fastify/releases/tag/v5.8.5 · Note
• https://github.com/fastify/fastify/commit/f3d2bcb3963cd570a582e5d39aab01a9ae692fe4 · Note
• https://github.com/fastify/fastify/commit/436da4c06dfbbb8c24adee3a64de0c51e4f47418 · Note
• https://access.redhat.com/security/cve/CVE-2026-33806 · Note