{"id":"MAL-2026-13490","title":"Malicious code in fast-hashes (PyPI)","summary":"Malicious code in fast-hashes (PyPI)","severity":"none","vendor":"fast-hashes","product":"fast-hashes","ecosystem":"pip","affected":["fast-hashes"],"published":"2026-08-07","updated":"2026-08-07","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/MAL-2026-13490","references":[{"url":"https://www.virustotal.com/gui/file/425f5336182e359211b5d751786d2ce1d31a673ea9c82107358a888803742649/detection"},{"url":"https://tria.ge/260807-fkycrazzg1/behavioral1"},{"url":"https://bad-packages.kam193.eu/pypi/package/fast-hashes"},{"url":"https://pypi.org/project/fast-hashes/0.1.0/"}],"tags":["osv","pip"],"ingestedAt":"2026-08-07T19:14:15.228Z","slug":"MAL-2026-13490","body":"## Overview\n\n\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (503b750458783954b66f8dea6ee8b0300fd7db5b225280f1af432cf78c1faf6d)\nsetup.py defines a custom install command (NativeInstall.run) that decodes a base64 blob and passes it to exec(compile(...)) at install time. The decoded payload downloads an opaque binary from https://github.com/totti2188/8gp1Q7iZD3h4VW/releases/download/v1.3A/something to /tmp/something, chmods it to 0755, and Popen-launches it detached with start_new_session=True. The fetch target's GitHub account (totti2188) is unrelated to the declared package publisher, the binary is unpinned and unverified, and the fetch-and-execute logic is concealed behind a base64 blob labeled _COMPAT_PAYLOAD with a benign-sounding '_configure_native_bindings' cover story. The package's non-install code only wraps hashlib and has no legitimate need for a native binary. Any pip install of this version triggers arbitrary code execution on the installer's host under the identity of a third-party GitHub account.\n\n## Source: kam193 (658a96d4157086ae099c38b27ef8fb7d1664956a251f21d55a9d8cb208c0a8fc)\nPackage imitates name of a popula library. During installation, obfuscated code downloads a malicious executable and starts it. It then exfiltrates at least cryptocurrency wallet data, probably more.\n\n\n---\n\nCategory: MALICIOUS - The campaign has clearly malicious intent, like infostealers.\n\n\nCampaign: 2026-08-flasq\n\n\nReasons (based on the campaign):\n\n\n - typosquatting\n\n\n - The package overrides the install command in setup.py to execute malicious code during installation.\n\n\n - exfiltration-generic\n\n\n - Downloads and executes a remote executable.\n\n\n - obfuscation\n\n\n - exfiltration-crypto\n\n\n## Affected packages\n\n- `fast-hashes`\n\n## Remediation\n\nRefer to the advisory for the patched release.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}