VDB
CVE-2026-27590
CVE-2026-27590
PUBLISHED
CVSS 8.899999618530273 HIGH
Caddy: Unicode case-folding length expansion causes incorrect split_path index in FastCGI transport
EPSS 0.25% · 48.0th percentile
Risk Scores
CVSS 4.0
8.899999618530273
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
EPSS Score
0.25%
48.0th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| github.com | caddyserver/caddy/v2 | 0, 0 |
| caddyserver | caddy | < 2.11.1, 0, < 2.11.1 |
Timeline
- Feb 20, 2026 CVE ID Reserved
- Feb 24, 2026 CVE Published
- Feb 24, 2026 PoC Published
- Feb 25, 2026 EPSS Score
- Feb 25, 2026 PoC Published
- Feb 25, 2026 PoC Published
- Feb 27, 2026 EPSS Score
- Feb 28, 2026 EPSS Score
- Mar 2, 2026 EPSS Score
- Mar 3, 2026 EPSS Score
- Mar 5, 2026 EPSS Score
- Mar 6, 2026 EPSS Score
References
- https://github.com/caddyserver/caddy/security/advisories/GHSA-5r3v-vc8m-m96g url
- https://github.com/php/frankenphp/security/advisories/GHSA-g966-83w7-6w38 url
- https://github.com/caddyserver/caddy/releases/tag/v2.11.1 url
- https://nvd.nist.gov/vuln/detail/CVE-2026-27590 advisory
- https://github.com/caddyserver/caddy package
- https://pkg.go.dev/vuln/GO-2026-4536 url