CVE-2026-3635 Affecting trigger-dev package, versions <4.5.0-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-MINIMOSLATEST-TRIGGERDEV-17805064
- published3 Jul 2026
- disclosed23 Mar 2026
Introduced: 23 Mar 2026
CVE-2026-3635 (opens in a new tab)How to fix?
Upgrade Minimos:latest trigger-dev to version 4.5.0-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream trigger-dev package and not the trigger-dev package as distributed by Minimos.
See How to fix? for Minimos:latest relevant fixed versions and status.
Summary When trustProxy is configured with a restrictive trust function (e.g., a specific IP like trustProxy: '10.0.0.1', a subnet, a hop count, or a custom function), the request.protocol and request.host getters read X-Forwarded-Proto and X-Forwarded-Host headers from any connection — including connections from untrusted IPs. This allows an attacker connecting directly to Fastify (bypassing the proxy) to spoof both the protocol and host seen by the application.
Affected Versions fastify <= 5.8.2
Impact Applications using request.protocol or request.host for security decisions (HTTPS enforcement, secure cookie flags, CSRF origin checks, URL construction, host-based routing) are affected when trustProxy is configured with a restrictive trust function.
When trustProxy: true (trust everything), both host and protocol trust all forwarded headers — this is expected behavior. The vulnerability only manifests with restrictive trust configurations.
References
- https://www.cve.org/CVERecord?id=CVE-2026-3635
- https://github.com/advisories/GHSA-444r-cwp2-x5xf
- https://osv.dev/vulnerability/MINI-546q-564w-xhxv
- https://osv.dev/vulnerability/CVE-2026-3635
- https://cna.openjsf.org/security-advisories.html
- https://github.com/fastify/fastify/security/advisories/GHSA-444r-cwp2-x5xf