bs58-77

{"schema_version":"1.7.4","id":"MAL-2026-14018","published":"2026-08-13T00:00:00Z","modified":"2026-08-14T14:53:28.052737918Z","summary":"Malicious code in bs58-77 (npm)","details":"npm/bs58-77 is a typosquat of the popular bs58 base58 codec (cryptocoinjs). The package contains no malicious code of its own: its src/cjs/index.cjs simply does require(\"base65-77x\") and re-exports it. Its sole purpose is to pull in the malicious sink package base65-77x as a runtime dependency (declared dependency: base65-77x: ^5.0.1). base65-77x is a near-verbatim clone of base-x whose decode() exfiltrates every string passed to it by POSTing the raw input to a hardcoded bare-IP C2 (http://46.250.253.63:3000/api/log) before throwing; because base-x/bs58 are how crypto tooling base58-decodes private keys and seeds, the exfiltrated values are frequently secrets. The sink is reported separately as MAL-2026-13750. bs58-77 and its sibling wrappers (bs58-15, bs58-33) were published alongside the three base65 sinks by a single npm maintainer account (smallmantis) within a ~90-minute window on 2026-08-11, forming a matched six-package delivery-plus-exfiltration campaign. Installing bs58-77 is sufficient to introduce the key-exfiltration behavior into a dependent project.\n\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (b115b88f23da3c8c4256b2d15d8766695ddadde12e884e1c36c36440b4652ba7)\nThe package was found to contain malicious code or consuming dependency that contains malicious code\n","affected":[{"package":{"name":"bs58-77","ecosystem":"npm"},"versions":["6.0.1"],"database_specific":{"cwes":[{"cweId":"CWE-506","description":"The product contains code that appears to be malicious in nature.","name":"Embedded Malicious Code"}],"indicators":{"package_integrity":[{"filename":"bs58-77-6.0.1.tgz","hashes":{"sha1":"0201e6c021b382e3817c3ee01bbea3feb7a9e56c","sha512_sri":"sha512-arJN3rvYltk3Fgs25h7ajKpeoy0sf9SnCYTpS0L07Yy3sPw4CCqmOJw+CwJMTT/UdR5xqrE9bCddgR+NG9xfRQ=="}}]}}}],"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/bs58-77"},{"type":"ADVISORY","url":"https://osv.dev/vulnerability/MAL-2026-13750"},{"type":"WEB","url":"https://pkgwarden.com/incidents/base65-npm-august-2026/"},{"type":"PACKAGE","url":"https://www.npmjs.com/package/bs58-77/v/6.0.1"}],"database_specific":{"malicious-packages-origins":[{"id":"IN-MAL-2026-017787","import_time":"2026-08-14T14:51:38.556245146Z","modified_time":"2026-08-14T14:36:12Z","sha256":"b115b88f23da3c8c4256b2d15d8766695ddadde12e884e1c36c36440b4652ba7","source":"amazon-inspector","versions":["6.0.1"]}]},"credits":[{"name":"Amazon Inspector","contact":["inspector-research@amazon.com"],"type":"FINDER"},{"name":"pkgwarden","contact":["https://pkgwarden.com"],"type":"FINDER"}]}