{"id":"GHSA-876p-8259-xjgg","summary":"libp2p nodes vulnerable to attack using large RSA keys","details":"### Impact\nA 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.\nTo prevent this attack, go-libp2p now restricts RSA keys to \u003c= 8192 bits.\n\n### Patches\nUsers should upgrade their go-libp2p versions to \u003e=v0.27.8, \u003e= v0.28.2, or \u003e=v0.29.1\nTo protect your application, it's necessary to update to these patch releases **AND** to use the updated Go compiler (1.20.7 or 1.19.12, respectively)\n\n### Workarounds\nThere are no known workarounds\n\n### References\nThe Golang crypto/tls package also had this vulnerability (\"verifying certificate chains containing large RSA keys is slow” https://github.com/golang/go/issues/61460)\nFix in golang/go crypto/tls: https://github.com/golang/go/commit/2350afd2e8ab054390e284c95d5b089c142db017\nFix in quic-go https://github.com/quic-go/quic-go/pull/4012","aliases":["CVE-2023-39533","GO-2023-2000"],"modified":"2026-09-01T21:45:14.078848597Z","published":"2023-08-09T13:18:18Z","database_specific":{"nvd_published_at":"2023-08-08T19:15:10Z","cwe_ids":["CWE-770"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2023-08-09T13:18:18Z"},"references":[{"type":"WEB","url":"https://github.com/libp2p/go-libp2p/security/advisories/GHSA-876p-8259-xjgg"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-39533"},{"type":"WEB","url":"https://github.com/golang/go/issues/61460"},{"type":"WEB","url":"https://github.com/libp2p/go-libp2p/pull/2454"},{"type":"WEB","url":"https://github.com/quic-go/quic-go/pull/4012"},{"type":"WEB","url":"https://github.com/golang/go/commit/2350afd2e8ab054390e284c95d5b089c142db017"},{"type":"WEB","url":"https://github.com/libp2p/go-libp2p/commit/0cce607219f3710addc7e18672cffd1f1d912fbb"},{"type":"WEB","url":"https://github.com/libp2p/go-libp2p/commit/445be526aea4ee0b1fa5388aa65d32b2816d3a00"},{"type":"WEB","url":"https://github.com/libp2p/go-libp2p/commit/e30fcf7dfd4715ed89a5e68d7a4f774d3b9aa92d"},{"type":"PACKAGE","url":"https://github.com/libp2p/go-libp2p"},{"type":"WEB","url":"https://go.dev/issue/61460"},{"type":"WEB","url":"https://nrdax.com/techniques/NRDAX-T0205-pre-handshake-crypto-cpu-burn"}],"affected":[{"package":{"name":"github.com/libp2p/go-libp2p","ecosystem":"Go","purl":"pkg:golang/github.com/libp2p/go-libp2p"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.27.8"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/08/GHSA-876p-8259-xjgg/GHSA-876p-8259-xjgg.json"}},{"package":{"name":"github.com/libp2p/go-libp2p","ecosystem":"Go","purl":"pkg:golang/github.com/libp2p/go-libp2p"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.28.0"},{"fixed":"0.28.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/08/GHSA-876p-8259-xjgg/GHSA-876p-8259-xjgg.json"}},{"package":{"name":"github.com/libp2p/go-libp2p","ecosystem":"Go","purl":"pkg:golang/github.com/libp2p/go-libp2p"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.29.0"},{"fixed":"0.29.1"}]}],"versions":["0.29.0"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/08/GHSA-876p-8259-xjgg/GHSA-876p-8259-xjgg.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}