{"id":"RUSTSEC-2026-0219","summary":"Remote Denial of Service via malformed NIP-04 IV","details":"The `nostr` crate did not validate the length of the initialization vector\ndecoded from the `?iv=` portion of a NIP-04 encrypted message.\n\nThe decoded IV was converted from a byte slice to the 16-byte AES-CBC IV type\nusing a conversion that asserts the slice length. As a result, an IV whose\ndecoded length was not exactly 16 bytes caused a panic before ciphertext\ndecryption. For example, `?iv=AAAA` decodes to a three-byte IV and triggers the\npanic.\n\nApplications that decrypt untrusted NIP-04 content are affected. The issue is\nalso reachable through NIP-47 (Nostr Wallet Connect), where response and\nnotification events from a malicious or compromised wallet service are passed\nto NIP-04 decryption. If the panic is not isolated, a crafted event can terminate\nthe application or disrupt message processing, causing a denial of service.\n\nThe issue does not affect confidentiality or integrity.\n\nThe flaw was corrected by converting the decoded IV to `[u8; 16]` using a\nchecked conversion. Invalid IV lengths now return a `Malformed` error instead of\npanicking.\n\n## Credit\n\nDiscovered and responsibly disclosed by **Muhammed Shekho** ([mhd-shekho.com](https://mhd-shekho.com)).","aliases":["GHSA-xg7c-246g-6qpv"],"modified":"2026-08-01T11:45:04.785279192Z","published":"2026-07-26T12:00:00Z","database_specific":{"license":"CC0-1.0"},"references":[{"type":"PACKAGE","url":"https://crates.io/crates/nostr"},{"type":"ADVISORY","url":"https://rustsec.org/advisories/RUSTSEC-2026-0219.html"},{"type":"WEB","url":"https://github.com/nostrdevkit/nostr/commit/b24619346f666d08ef7fefe27f033b8bc871697f"}],"affected":[{"package":{"name":"nostr","ecosystem":"crates.io","purl":"pkg:cargo/nostr"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.0.0-0"},{"fixed":"0.44.6"},{"introduced":"0.45.0-alpha.1"},{"fixed":"0.45.0-alpha.6"}]}],"ecosystem_specific":{"affected_functions":null,"affects":{"os":[],"functions":["nostr::nips::nip04::decrypt","nostr::nips::nip04::decrypt_to_bytes"],"arch":[]}},"database_specific":{"cvss":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","informational":null,"categories":["denial-of-service"],"source":"https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2026-0219.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}