{"items":[{"id":"NVI-00015127","kind":"vulnerability","title":"Russh: Pre-auth remote panic via all-zero Curve25519 peer public value (encode_mpint OOB)","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-5xvq-cp9x-6p6r","CVE-2026-73430"],"plain_summary":"GitHub lists this reviewed advisory for russh. 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-27f32504d820b6e80f9e57aabfe7fb08"],"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":"2026-08-12T20:55:42.000Z","value":"5.3 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-27f32504d820b6e80f9e57aabfe7fb08"}],"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-27f32504d820b6e80f9e57aabfe7fb08","url":"https://github.com/advisories/GHSA-5xvq-cp9x-6p6r","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-5xvq-cp9x-6p6r","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T20:16:47.162Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-27f32504d820b6e80f9e57aabfe7fb08"],"technology":"russh","known_exclusions":[],"conditions_summary":"A pre-authentication denial-of-service panic in `russh` 0.62.2 (commit\n`c4be19f1915c8682f4615c3fd50008512b474491`, current default branch `main` as\nof 2026-07-22). An unauthenticated client sends a single `SSH_MSG_KEX_ECDH_INIT`\nwhose `Q_C` is 32 zero bytes. russh's Curve25519 KEX does not reject the\nall-zero peer public value, so `server_dh()` computes the all-zero shared\nsecret and `compute_exchange_hash()` then calls `encode_mpint(&shared.0, ...)`,\nwhich indexes `s[i]` at `i == s.len()` and **panics** (`index out of bounds:\nthe len is 32 but the index is 32`) **before host-key signature verification**.\nThe server KEX task dies on the first KEX message, before authentication.\n\nThis is reachable with the **default** server configuration\n(`Config::default()` → `Preferred::DEFAULT`, whose kex list includes\n`curve25519-sha256`) and requires **no caller-supplied parameter**. It is\nreproduced end-to-end against the unmodified real russh 0.62.2 library (a real\nserver + raw TCP client over TCP); the PoC below links the real crate, not a\ncopied snippet. The defect is still present on `main` HEAD (`v0.62.3`,\n2026-07-22) and is not covered by any of the 11 published russh GHSA advisories\n(G","public_affected_ranges":["<= 0.62.3"]}],"null_published_at":"2026-11-03T10:03:26.552Z","source_updated_at":"2026-08-12T20:55:42.000Z","source_disclosed_at":"2026-07-24T16:45:26.000Z","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":"2026-11-02T20:16:47.162Z"}],"next_cursor":null,"snapshot_revision":"42594"}