---
cve: "CVE-2026-4746"
severity: "CRITICAL"
cvss: 10.0
epss: "0.3%"
vendor: "timeplus-io"
kev: false
exploited: false
published: "2026-03-24 05:16:25"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-11-08T18:34:49+01:00"
---

# CVE-2026-4746

> 10.0 CRITICAL · 🧪 PoC

## Beschreibung

Out-of-bounds Write vulnerability in timeplus-io proton (base/poco/Foundation/src‎ modules). This vulnerability is associated with program files inflate.C.

This issue affects proton: before 1.6.16.

## CNA-Record (Kanon, cvelistV5)

- CNA: **GovTech CSG**
- State: PUBLISHED
- Stand: 2026-03-24 18:25:06
- CNA-CVSS: **10.0** (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/S:N/AU:Y/R:U/V:C/RE:L/U:Amber`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **yes**
  - Technical Impact: **total**

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/S:N/AU:Y/R:U/V:C/RE:L/U:Amber
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Schwachstellen-Klasse

- **CWE-787** — Out-of-bounds Write
  The product writes data past the end, or before the beginning, of the intended buffer.

## Patch verfügbar (OSV)

- e5ec04647fae67c8b7d6f0981ba8b23f7e47c82a (Commit)

## Referenzen

- <https://github.com/timeplus-io/proton/pull/943>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-4746/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_