CVE Explorer
CVE-2026-3419
Fastify incorrectly accepts malformed `Content-Type` headers containing trailing characters after the subtype token, in violation of RFC 9110 §8.3.1(https://httpwg.org/specs/rfc9110.html#field.content-type). For example, a request sent with Content-Type: application/json garbage passes validation and is processed normally, rather than being rejected with 415 Unsupported Media Type.
When regex-based content-type parsers are in use (a documented Fastify feature), the malformed value is matched ag
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","packageURL":"pkg:npm/fastify","product":"fastify","vendor":"fastify","versions":[{"lessThan":"5.8.1","status":"affected","version":"5.7.2","versionType":"semver"},{"status":"unaffected","version":"5.8.1","versionType":"semver"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:343ac97851e97618740ab5787965eedea2243be4739c229946a3788025ebdf80 · sha256:94f607a2db493322… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"baseScore":5.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:343ac97851e97618740ab5787965eedea2243be4739c229946a3788025ebdf80 · sha256:94f607a2db493322… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-185","description":"CWE-185: Incorrect Regular Expression","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:343ac97851e97618740ab5787965eedea2243be4739c229946a3788025ebdf80 · sha256:94f607a2db493322… · /containers/cna/problemTypes/0/descriptions/0
Source references
6 source assertions{"url":"https://cna.openjsf.org/security-advisories.html"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:343ac97851e97618740ab5787965eedea2243be4739c229946a3788025ebdf80 · sha256:94f607a2db493322… · /containers/cna/references/4
{"url":"https://github.com/advisories/GHSA-573f-x89g-hqp9"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:343ac97851e97618740ab5787965eedea2243be4739c229946a3788025ebdf80 · sha256:94f607a2db493322… · /containers/cna/references/3
{"url":"https://github.com/fastify/fastify/commit/67f6c9b32cb3623d3c9470cc17ed830dd2f083d7"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:343ac97851e97618740ab5787965eedea2243be4739c229946a3788025ebdf80 · sha256:94f607a2db493322… · /containers/cna/references/1
{"url":"https://github.com/fastify/fastify/security/advisories/GHSA-573f-x89g-hqp9"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:343ac97851e97618740ab5787965eedea2243be4739c229946a3788025ebdf80 · sha256:94f607a2db493322… · /containers/cna/references/0
{"url":"https://httpwg.org/specs/rfc9110.html#field.content-type"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:343ac97851e97618740ab5787965eedea2243be4739c229946a3788025ebdf80 · sha256:94f607a2db493322… · /containers/cna/references/2
{"url":"https://www.cve.org/CVERecord?id=CVE-2026-3419"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:343ac97851e97618740ab5787965eedea2243be4739c229946a3788025ebdf80 · sha256:94f607a2db493322… · /containers/cna/references/5
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.