---
cve: "CVE-2026-47242"
severity: "MEDIUM"
cvss: 5.8
epss: "13%"
vendor: "Ruby"
kev: false
exploited: false
published: "2026-06-22 21:16:24"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-11T13:01:35+02:00"
---

# CVE-2026-47242

> 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, when Net::IMAP#id is called with a hash argument, although the ID field value strings are correctly quoted (escaping quoted specials), they were not validated to prohibit CRLF sequences. While Net::IMAP#enable does process its arguments for aliases, it does not validate them as valid atoms (or as a list of valid atoms). The #to_s value is sent verbatim. Arguments to either command could be used by an attacker to inject arbitrary IMAP commands. 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-46q3-7gv7-qmgg>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-47242) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_