---
cve: "CVE-2026-55406"
severity: "MEDIUM"
cvss: 5.9
epss: "13%"
vendor: "anthropics"
kev: false
exploited: false
published: "2026-07-16 17:16:57"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-10T22:34:15+02:00"
---

# CVE-2026-55406

> 5.9 MEDIUM · 🧪 PoC

## Beschreibung

Buffa is a pure-Rust Protocol Buffers implementation with first-class protobuf editions support. Prior to 0.7.0, a soundness bug in the OwnedView type allowed safe Rust code to trigger a use-after-free: the OwnedView::decode constructor transmuted a borrowed slice to &'static [u8], and the Deref implementation exposed the promoted 'static lifetime on borrowed view fields (such as &'static str and &'static [u8]) to callers, so the borrow checker permitted those references to outlive the OwnedView; once the OwnedView was dropped and its backing buffer freed, the references became dangling, enabling memory corruption, information disclosure of freed heap contents, and cross-thread misuse without any unsafe code in the calling application. This issue is fixed in version 0.7.0.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 7dcf50a1a40eca6ed8d6c6dd59f4310aa0d68b0e (Commit)
- 9ce9ab74e4ea18c3abda901b4054fea3fa193349 (Commit)

## Referenzen

- <https://github.com/anthropics/buffa/security/advisories/GHSA-9pwq-gcrx-wghh>
- <https://github.com/anthropics/buffa/pull/154>
- <https://github.com/anthropics/buffa/commit/7dcf50a1a40eca6ed8d6c6dd59f4310aa0d68b0e>
- <https://github.com/anthropics/buffa/releases/tag/v0.7.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-55406) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_