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CVE-2023-39533— libp2p nodes vulnerable to attack using large RSA keys

Quick assessment

Affected
libp2p go-libp2p
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

go-libp2p是Go中的libp2p实现。 go-libp2p存在安全漏洞，该漏洞源于core/crypto模块存在安全漏洞，攻击者可利用该漏洞迫使节点对大型RSA密钥进行签名验证，导致资源耗尽。受影响的产品和版本：go-libp2p 0.27.8之前版本，0.28.2之前版本，0.29.1之前版本。

CVSS 7.5 · High EPSS 1.33% · P69
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I. Basic Information for CVE-2023-39533

Vulnerability Information
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Vulnerability Title
libp2p nodes vulnerable to attack using large RSA keys
Source: CVE Program / CVE List V5
Vulnerability Description
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 <= 8192 bits. To protect one's application, it is necessary to update to these patch releases and to use the updated Go compiler in 1.20.7 or 1.19.12. There are no known workarounds for this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
go-libp2p 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
go-libp2p是Go中的libp2p实现。 go-libp2p存在安全漏洞，该漏洞源于core/crypto模块存在安全漏洞，攻击者可利用该漏洞迫使节点对大型RSA密钥进行签名验证，导致资源耗尽。受影响的产品和版本：go-libp2p 0.27.8之前版本，0.28.2之前版本，0.29.1之前版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
libp2p go-libp2p < 0.27.8 -

II. Public POCs for CVE-2023-39533

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8702 chars
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III. Intelligence Information for CVE-2023-39533

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Patches & Fixes for CVE-2023-39533 (6)

Vendor Advisories for CVE-2023-39533 (1)

Other References for CVE-2023-39533 (1)

IV. Related Vulnerabilities

Same product: go-libp2p
Same vendor: libp2p
Same weakness: CWE-770

V. Comments for CVE-2023-39533

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