---
cve: "CVE-2026-32746"
severity: "CRITICAL"
cvss: 9.8
epss: "2.4%"
vendor: "GNU"
kev: false
exploited: false
published: "2026-03-13 19:55:10"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-28T12:55:34+01:00"
---

# CVE-2026-32746

> 9.8 CRITICAL

## Beschreibung

telnetd in GNU inetutils through 2.7 allows an out-of-bounds write in the LINEMODE SLC (Set Local Characters) suboption handler because add_slc does not check whether the buffer is full.

## CNA-Record (Kanon, cvelistV5)

- CNA: **mitre**
- State: PUBLISHED
- Stand: 2026-03-23 13:13:55
- CNA-CVSS: **9.8** (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **poc**
  - Automatable: **yes**
  - Technical Impact: **total**

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Schwachstellen-Klasse

- **CWE-120** — Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
  The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

## Angriffsmuster (CAPEC)

- [CAPEC-10 — Buffer Overflow via Environment Variables](https://capec.mitre.org/data/definitions/10.html) _(Severity: High)_
- [CAPEC-14 — Client-side Injection-induced Buffer Overflow](https://capec.mitre.org/data/definitions/14.html) _(Severity: High)_
- [CAPEC-24 — Filter Failure through Buffer Overflow](https://capec.mitre.org/data/definitions/24.html) _(Severity: High)_
- [CAPEC-42 — MIME Conversion](https://capec.mitre.org/data/definitions/42.html) _(Severity: High)_
- [CAPEC-44 — Overflow Binary Resource File](https://capec.mitre.org/data/definitions/44.html) _(Severity: Very High)_
- [CAPEC-45 — Buffer Overflow via Symbolic Links](https://capec.mitre.org/data/definitions/45.html) _(Severity: High)_
- [CAPEC-46 — Overflow Variables and Tags](https://capec.mitre.org/data/definitions/46.html) _(Severity: High)_
- [CAPEC-100 — Overflow Buffers](https://capec.mitre.org/data/definitions/100.html) _(Severity: Very High)_

## Exploit-Evidenz

- [EDB-52556 — telnetd 2.7 - Buffer Overflow](https://www.exploit-db.com/exploits/52556)

## BSI-Hinweise (deutsch)

- [GNU InetUtils: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-0734) — _BSI-Einstufung: kritisch_
  Ein Angreifer kann mehrere Schwachstellen in GNU InetUtils ausnutzen, um beliebigen Programmcode auszuführen, und um Informationen offenzulegen.

## Referenzen

- <https://www.openwall.com/lists/oss-security/2026/03/12/4>
- <https://lists.gnu.org/archive/html/bug-inetutils/2026-03/msg00031.html>
- <http://www.openwall.com/lists/oss-security/2026/03/14/1>
- <https://github.com/watchtowrlabs/watchtowr-vs-telnetd-CVE-2026-32746>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-32746/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_