8.2
CVE-2026-27959
- EPSS 0.33%
- Veröffentlicht 26.02.2026 01:45:45
- Zuletzt bearbeitet 15.07.2026 02:19:12
- CVE-Watchlists
- Unerledigt
LoginKoa has Host Header Injection via `ctx.hostname`
Koa is middleware for Node.js using ES2017 async functions. Prior to versions 3.1.2 and 2.16.4, Koa's `ctx.hostname` API performs naive parsing of the HTTP Host header, extracting everything before the first colon without validating the input conforms to RFC 3986 hostname syntax. When a malformed Host header containing a `@` symbol is received, `ctx.hostname` returns `evil[.]com` - an attacker-controlled value. Applications using `ctx.hostname` for URL generation, password reset links, email verification URLs, or routing decisions are vulnerable to Host header injection attacks. Versions 3.1.2 and 2.16.4 fix the issue.
| Typ | Quelle | Score | Percentile |
|---|---|---|---|
| EPSS | FIRST.org | 0.33% | 0.252 |
| Quelle | Base Score | Exploit Score | Impact Score | Vector String |
|---|---|---|---|---|
| security-advisories@github.com | 7.5 | 3.9 | 3.6 |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
|
| 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | 8.2 | 3.9 | 4.2 |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
|
CWE-20 Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
https://github.com/koajs/koa/commit/55ab9bab044ead4e82c70a30a4f9dc0fc9c1b6df
https://github.com/koajs/koa/commit/b76ddc01fdb703e51652b0fd131d16394cadcfeb
https://bugzilla.redhat.com/show_bug.cgi?id=2442928
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27959.json
https://access.redhat.com/errata/RHSA-2026:10184
https://access.redhat.com/errata/RHSA-2026:7249
https://github.com/koajs/koa/security/advisories/GHSA-7gcc-r8m5-44qm
https://access.redhat.com/security/cve/CVE-2026-27959