{"answers":{"affected":"1 open source package ship an affected version, including @workoscalif/sudoku.","exploited":"There is no known exploitation of MAL-2026-13366 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-2026-13366 is a malicious package in @workoscalif/sudoku, published on 5 Aug 2026."},"fix_prompt":"MAL-2026-13366 is a malicious package: @workoscalif/sudoku (npm). 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-2026-13366/ (Markdown: https://insights.sbomify.com/MAL-2026-13366/index.md)","id":"MAL-2026-13366","markdown":"https://insights.sbomify.com/MAL-2026-13366/index.md","name":"MAL-2026-13366","record":{"aliases":[],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"package.json declares a postinstall script that spawns vendor/gridgen-linux-x64 during `npm install`. The README describes this file as a ~34 kB static ELF built from a ~150-line C sudoku generator (native/gridgen.c), but the shipped artifact is a ~33.6 MB Go runtime executable (strings include `runtime.`, `reflect.`, `GODEBUG`, `chacha8`, `godebugs.Info`) — roughly 1000x the advertised size and a different language/toolchain than the shipped source. The binary contains `/proc/self/cgroup` and `/proc/self/mountinfo` strings, which are container/CI environment fingerprints unrelated to generating sudoku puzzles. The postinstall short-circuits unless `process.platform === 'linux' \u0026\u0026 process.arch === 'x64'` and honors `SUDOKU_SKIP_POSTINSTALL=1`, so developer laptops (macOS/Windows) and reviewers using `--ignore-scripts` do not execute the binary. The npm scope `@workoscalif` visually resembles the WorkOS authentication vendor while the package is an unrelated personal project (author `anas cherni`, homepage github.com/anascherni/sudoku), increasing the likelihood a developer installs it believing it is vendor-endorsed. The combination of a documentation/contents mismatch, a large opaque binary from an unrelated toolchain, Linux-x64/CI gating, container fingerprinting strings, and a scope resembling a known vendor is the opaque-native-binary dropper shape rather than the advertised C sudoku helper.","ecosystems":["npm"],"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 @workoscalif/sudoku (npm)","id":"MAL-2026-13366","indexable":true,"kev":null,"kind":"malicious","links":{"ecosystem":"npm","product":null,"products":[],"type":null,"year":"2026"},"n_packages":1,"n_references":null,"packages":[{"ecosystem":"npm","fixed":[],"introduced":[],"last_affected":[],"package":"@workoscalif/sudoku","purl":"pkg:npm/%40workoscalif/sudoku","source":"MAL-2026-13366"}],"products":null,"published":"2026-08-05","related":[],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"OpenSSF Malicious Packages","prefix":"MAL"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":null,"updated":null,"vendors":null},"summary":null,"url":"https://insights.sbomify.com/MAL-2026-13366/"}