---
cve: "CVE-2026-55078"
severity: "MEDIUM"
cvss: 6.5
epss: "34%"
vendor: "coder"
kev: false
exploited: false
published: "2026-07-07 23:16:55"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-17T10:01:29+02:00"
---

# CVE-2026-55078

> 6.5 MEDIUM · 🧪 PoC

## Beschreibung

Coder allows organizations to provision remote development environments via Terraform. Starting in version 2.17.0 and prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, `POST /api/v2/files` converts zip uploads to tar in memory via `CreateTarFromZip`, which enforced a per-entry size limit but no aggregate limit on total decompressed output, writing to an unbounded in-memory buffer. Exploitation requires authenticated file-upload access and the impact is limited to availability (denial of service). The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 adds a metadata preflight check that sums projected entry sizes and a streaming writer that enforces the aggregate limit during decompression. As a workaround, restrict file-upload permissions to trusted users or place a reverse proxy with request-body size limits in front of `coderd`.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 77253bfc55665027a374a5d2fb70f4ff74410326 (Commit)
- 0374b00b63bc5043a507194f284ef298e0ea3b52 (Commit)

## Referenzen

- <https://github.com/coder/coder/security/advisories/GHSA-2mg2-p7r7-g27f>
- <https://github.com/coder/coder/pull/25877>
- <https://github.com/coder/coder/releases/tag/v2.29.17>
- <https://github.com/coder/coder/releases/tag/v2.32.7>
- <https://github.com/coder/coder/releases/tag/v2.33.8>
- <https://github.com/coder/coder/releases/tag/v2.34.2>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-55078) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_