{"id":"CVE-2026-54542","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-54542","summary":"nimiq-primitives: Out-of-bounds panic in KeyNibbles::Add from oversized child suffix in a deserialized proof","details":"### Impact\n\nA malicious peer acting as a state-sync source can crash a syncing node with a crafted `TrieChunk` whose proof contains a `TrieNodeChild` whose `suffix`, when concatenated with the parent key via `KeyNibbles::Add`, exceeds the fixed 63-byte backing array. `Add` (`primitives/src/key_nibbles.rs:332` / `:341`) indexes `bytes[self.bytes_len()..self.bytes_len() + other.bytes_len()]` with no combined-length check, causing an out-of-bounds slice panic (both the even- and odd-length branches).\n\n`KeyNibbles` deserialization validates only the individual `length <= 126`, not the combined parent + suffix length. The panic occurs at `put_chunk` → `child.key()` → `is_stump()` → `+`, i.e. **before** `proof.verify()`, so no valid proof is required. As with the related `child_index` issue, exploitation requires being the victim's sync peer during state sync, and the resulting crash is transient (the node restarts and re-syncs).\n\nAffected: core-rs-albatross <= 1.5.1 (`nimiq-primitives`).\n\n### Patches\n\nFixed in **1.6.0** via https://github.com/nimiq/core-rs-albatross/pull/3790 (commit `eabfc3e2`), which guards key-nibble concatenation against exceeding the maximum length instead of indexing out of bounds.\n\n### Workarounds\n\nNone other than syncing only from trusted peers. Upgrade to 1.6.0.","published":"2026-07-16T20:03:25Z","modified":"2026-07-16T20:15:16.090427208Z","cvss":{"score":3.7,"severity":"LOW","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"crates.io","name":"nimiq-primitives","fixedVersion":"1.6.0"}],"fix":{"url":"https://github.com/nimiq/core-rs-albatross/pull/3790","label":"nimiq/core-rs-albatross#3790"},"references":[{"type":"WEB","url":"https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-5rg2-xv9j-gv5p"},{"type":"WEB","url":"https://github.com/nimiq/core-rs-albatross/pull/3790"},{"type":"WEB","url":"https://github.com/nimiq/core-rs-albatross/commit/eabfc3e21731b0628c3f933163a0f1e1864217bf"},{"type":"PACKAGE","url":"https://github.com/nimiq/core-rs-albatross"},{"type":"WEB","url":"https://github.com/nimiq/core-rs-albatross/releases/tag/v1.6.0"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-16T20:15:16.090427208Z"}}