---
cve: "CVE-2026-47240"
severity: "MEDIUM"
cvss: 5.8
epss: "49%"
vendor: "Ruby"
kev: false
exploited: false
published: "2026-06-22 21:16:24"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-11T09:32:23+02:00"
---

# CVE-2026-47240

> 5.8 MEDIUM · 🧪 PoC

## Beschreibung

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, several Net::IMAP commands accept a "raw data" argument that is sent verbatim after validation to prevent command injection. However, if a server does not support non-synchronizing literals, it may still be possible to inject arbitrary IMAP commands inside non-synchronizing literals.  A server without support for non-synchronizing literals may interpret the "+}\r\n" as the end of a malformed command line and respond with a tagged BAD. In that case, the contents of the literal will be interpreted as one or more new pipelined commands, allowing a CRLF command injection attack to succeed. This affects criteria for #search and #uid_search; search_keys for #sort, #thread, #uid_sort, and #uid_thread; and attr for #fetch and #uid_fetch. This vulnerability is fixed in 0.6.5 and 0.5.15.

## CVSS-Vektor

```
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |

## Patch verfügbar (OSV)

- 357f3b5aee4d2140635b6ba242fbb952491e2d28 (Commit)
- ce20fc8e9974ed87d0848dc411eef490623cdeb9 (Commit)

## Referenzen

- <https://github.com/ruby/net-imap/security/advisories/GHSA-8p34-64r3-mwg8>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-47240) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_