---
cve: "CVE-2023-39533"
severity: "HIGH"
cvss: 7.5
epss: "1.3%"
vendor: "libp2p"
kev: false
exploited: false
published: "2023-08-08 19:15:10"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-03T06:40:46+02:00"
---

# CVE-2023-39533

> 7.5 HIGH · 🧪 PoC

## Beschreibung

go-libp2p is the Go implementation of the libp2p Networking Stack. Prior to versions 0.27.8, 0.28.2, and 0.29.1 malicious peer can use large RSA keys to run a resource exhaustion attack & force a node to spend time doing signature verification of the large key. This vulnerability is present in the core/crypto module of go-libp2p and can occur during the Noise handshake and the libp2p x509 extension verification step. To prevent this attack, go-libp2p versions 0.27.8, 0.28.2, and 0.29.1 restrict RSA keys to

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- 2350afd2e8ab054390e284c95d5b089c142db017 (Commit)
- 8506ab233441d434bb777615fffefab64b06f335 (Commit)

## Referenzen

- <https://github.com/libp2p/go-libp2p/security/advisories/GHSA-876p-8259-xjgg>
- <https://github.com/golang/go/issues/61460>
- <https://github.com/libp2p/go-libp2p/pull/2454>
- <https://github.com/quic-go/quic-go/pull/4012>
- <https://github.com/golang/go/commit/2350afd2e8ab054390e284c95d5b089c142db017>
- <https://github.com/libp2p/go-libp2p/commit/0cce607219f3710addc7e18672cffd1f1d912fbb>
- <https://github.com/libp2p/go-libp2p/commit/445be526aea4ee0b1fa5388aa65d32b2816d3a00>
- <https://github.com/libp2p/go-libp2p/commit/e30fcf7dfd4715ed89a5e68d7a4f774d3b9aa92d>
- <https://nrdax.com/techniques/NRDAX-T0205-pre-handshake-crypto-cpu-burn>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2023-39533) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_