{"answers":{"affected":"2 open source packages ship an affected version, including synago.","exploited":"There is no known exploitation of MAL-2026-5284 in the wild and no public exploit code.","fix":"Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.","what":"MAL-2026-5284 is a malicious package in synago, published on 6 Jun 2026."},"fix_prompt":"MAL-2026-5284 is a malicious package: synago (PyPI). Every version was published to cause harm.\n\nTask:\n1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.\n2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.\n3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.\n4. If the package is not used anywhere, say so and change nothing.\n\nReference: https://insights.sbomify.com/MAL-2026-5284/ (Markdown: https://insights.sbomify.com/MAL-2026-5284/index.md)","id":"MAL-2026-5284","markdown":"https://insights.sbomify.com/MAL-2026-5284/index.md","name":"MAL-2026-5284","record":{"aliases":["PYSEC-2026-609"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"The package installs synago-setup.pth, which Python auto-executes on every interpreter startup (not only on `import synago`). The.pth contains an obfuscated single-line `exec()` string with single-letter import aliases (`_o`, `_s`, `_u`, `_p`, `_y`, `_b`, `_j`, `_z`, `_zf`) gated by a `/tmp/.bun_ran` sentinel so it runs only once per machine. On first run it fetches `https://github.com/oven-sh/bun/releases/download/bun-v1.3.13/bun-{os}-{arch}.zip` via urllib, unzips it to `/tmp/b/bun`, chmods the binary executable (mode 509 / 0o775), deletes the zip, and invokes `subprocess.run([bun, 'run', _index.js])` against a JavaScript file shipped in the package. The package advertises itself as an LLM agent framework — there is no legitimate reason for it to install a `.pth` hook, fetch an alternate language runtime, stage it under `/tmp`, and execute bundled JavaScript at every Python invocation. The combination of `.pth` auto-execution (a vector that bypasses normal `import` sandboxes), obfuscated `exec()` of a quoted string, sentinel-based once-per-host gating to evade re-detonation, and an out-of-band runtime executing code that Python-only scanners will not inspect is the alternate-runtime dropper pattern. Installing this package causes arbitrary attacker-controlled JavaScript to execute on the installer's machine on every subsequent Python startup.\n\nVersions 0.1.1, 0.1.2 were compromised.\n\nCompromised packages start an obfuscated infostealer. The infostealer is a heavily obfuscated JavaScript code executed using Bun runtime on Python startup. It collectes all kinds of sensitive data, including API keys, credentials to package repositories, cryptocurrency assets, password manager data. Infostealer actively queries online services to collect additional secrets as well as attempts to gain persistence and spread further by publishing infected packages using collected credentials. Data are exfiltrated likely using Github. The code seems to threaten to wipe the user's data if it detects invalid GitHub tokens. Cleanup should be done with caution.\n\nIt seems to be related to the recent Mini Shai Hulud campaign.\n\n---\n\nCategory: MALICIOUS - The campaign has clearly malicious intent, like infostealers.\n\nCampaign: 2026-06-compr-woodpecker\n\nReasons (based on the campaign):\n\n - compromised-package\n\n - exfiltration-env-variables\n\n - exfiltration-cloud-tokens\n\n - exfiltration-credentials\n\n - abuses-pth\n\n - obfuscation\n\n - infostealer\n\n - The package contains code to detect if it is running in a sandbox environment.\n\n - exfiltration-crypto\n\n - files-exfiltration\n\n - destructive-actions","ecosystems":["PyPI"],"exploits":{"exploitdb":null,"first_seen":null,"github_poc":null,"max_poc_stars":null,"metasploit":null,"nuclei":null,"refs":[],"tier":null},"has_fix":false,"headline":"Malicious code in synago (PyPI)","id":"MAL-2026-5284","indexable":true,"kev":null,"kind":"malicious","links":{"ecosystem":"PyPI","product":null,"products":[],"type":null,"year":"2026"},"n_packages":2,"n_references":null,"packages":[{"ecosystem":"PyPI","fixed":[],"introduced":[],"last_affected":[],"package":"synago","purl":"pkg:pypi/synago","source":"MAL-2026-5284"},{"ecosystem":"PyPI","fixed":[],"introduced":[],"last_affected":[],"package":"synago","purl":"pkg:pypi/synago","source":"PYSEC-2026-609"}],"products":null,"published":"2026-06-06","related":[],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"OpenSSF Malicious Packages","prefix":"MAL"},{"class":"attribution","licence":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":null,"updated":null,"vendors":null},"summary":null,"url":"https://insights.sbomify.com/MAL-2026-5284/"}