Fiber: CORS wildcard origins matched without a dot boundary, allowing credentialed cross-origin reads

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0013, the 2nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 29 Oct 2026, 21:36 UTC Confirmed by the CVE List
2. 29 Oct 2026, 22:17 UTC Confirmed by NVD
3. 31 Oct 2026, 14:11 UTC First seen by agentprime
4. 31 Oct 2026, 14:11 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-g5jq-qmqr-qrwf
• OSV: GHSA-g5jq-qmqr-qrwf
• github.com/gofiber/fiber/security/advisories/GHSA-g5jq-qmqr-qrwf
• nvd.nist.gov/vuln/detail/CVE-2026-119285
• github.com/gofiber/fiber/pull/2915
• github.com/gofiber/fiber/commit/1aac6f618b6bd3e159d2449acb4232a2170b976b
• github.com/gofiber/fiber
• github.com/gofiber/fiber/releases/tag/v2.52.3

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.