{"items":[{"id":"NVI-00015352","kind":"vulnerability","title":"libp2p nodes vulnerable to attack using large RSA keys","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-876p-8259-xjgg","CVE-2023-39533"],"plain_summary":"GitHub lists this reviewed advisory for github.com/libp2p/go-libp2p, github.com/libp2p/go-libp2p, github.com/libp2p/go-libp2p. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-5e2e9e59598a548267c273fc50c7d3f5"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-09-01T21:35:31.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-5e2e9e59598a548267c273fc50c7d3f5"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-5e2e9e59598a548267c273fc50c7d3f5","url":"https://github.com/advisories/GHSA-876p-8259-xjgg","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-876p-8259-xjgg","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T02:21:50.763Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-5e2e9e59598a548267c273fc50c7d3f5"],"technology":"github.com/libp2p/go-libp2p","known_exclusions":[],"conditions_summary":"### 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 =v0.27.8, >= v0.28.2, or >=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","public_affected_ranges":["< 0.27.8"]},{"certainty":"source_listed","source_ids":["sr-5e2e9e59598a548267c273fc50c7d3f5"],"technology":"github.com/libp2p/go-libp2p","known_exclusions":[],"conditions_summary":"### 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 =v0.27.8, >= v0.28.2, or >=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","public_affected_ranges":[">= 0.28.0, < 0.28.2"]},{"certainty":"source_listed","source_ids":["sr-5e2e9e59598a548267c273fc50c7d3f5"],"technology":"github.com/libp2p/go-libp2p","known_exclusions":[],"conditions_summary":"### 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 =v0.27.8, >= v0.28.2, or >=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","public_affected_ranges":["= 0.29.0"]}],"null_published_at":"2026-11-03T10:03:31.350Z","source_updated_at":"2026-09-01T21:35:31.000Z","source_disclosed_at":"2023-08-09T13:18:18.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-02T02:21:50.763Z"}],"next_cursor":null,"snapshot_revision":"42594"}