{"answers":{"affected":"1 open source package ship an affected version, including tslint-folder-schema.","exploited":"There is no known exploitation of MAL-2026-11988 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-2026-11988 is a malicious package in tslint-folder-schema, published on 4 Aug 2026."},"fix_prompt":"MAL-2026-11988 is a malicious package: tslint-folder-schema (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-2026-11988/ (Markdown: https://insights.sbomify.com/MAL-2026-11988/index.md)","id":"MAL-2026-11988","markdown":"https://insights.sbomify.com/MAL-2026-11988/index.md","name":"MAL-2026-11988","record":{"aliases":["GHSA-mvxf-h63j-354v"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"npm/tslint-folder-schema is affected by the large-scale, self-propagating npm supply-chain worm of 2026-08-04 (the \"Shai-Hulud: Here We Go Again\" wave) — the same campaign that began with the compromise of the keyv and cacheable maintainer account. The listed version(s) were trojanized and republished by the worm after it reached an npm publish token belonging to a maintainer in this namespace; the payload enumerates every package a stolen token controls and republishes each with the same hook, so many packages under this scope were poisoned in the same short window. Every poisoned release adds a preinstall hook (`\"preinstall\": \"node setup.mjs\"`) that runs on a bare `npm install`, before any project code. setup.mjs downloads a standalone Bun runtime and runs a byte-identical, heavily obfuscated ~728 KB second-stage credential stealer (shipped as Math_Symbol.js / math_init.js). It harvests GitHub, npm, AWS, GCP, Azure, HashiCorp Vault and Kubernetes credentials plus generic secrets and private keys (TruffleHog-style sweep), reads CI/CD secrets and identifies build runners, then republishes further packages the stolen token can reach. Rather than a fixed command-and-control host, it exfiltrates stolen findings to attacker-created GitHub repositories (descriptions reading \"Shai-Hulud: Here We Go Again\") and over DNS. Treat any environment that installed an affected version (with install scripts enabled) as compromised: rotate and revoke all reachable credentials (npm and GitHub tokens, cloud keys, Vault/Kubernetes secrets, and CI org/repo secrets). Part of the August 2026 npm worm that poisoned 400+ packages across many organizations.\n\ntslint-folder-schema@1.0.12 declares a preinstall hook (`node setup.mjs`) that runs automatically on `npm install`. setup.mjs downloads the Bun runtime binary from `https://github.com/oven-sh/bun/releases/download/bun-v\u003cver\u003e/...`, extracts it to a temporary directory, chmod +x's it, and invokes it via `execFileSync(bunPath, [\u003cpath to math_init.js\u003e], {stdio:'inherit'})` to execute the shipped sibling file `math_init.js`. `math_init.js` is a 727KB heavily obfuscated blob (`// @bun @bun-cjs` header, string-array shuffle via `WV8StW` rotating a large mixed constant table, `_0x`-style identifier renaming) that is not referenced by the declared library entry `lib/folderSchemaRule.js` and only reachable through the preinstall→Bun path — the payload is designed to run under an alternate runtime so Node-based static analysis cannot reason about it. package.json also impersonates an unrelated organization: name is `tslint-folder-schema` but homepage and repository point at `github.com/servicetitan/folder-lint`, and the visible library code mirrors that project's tslint rule as cover. The alternate-runtime-dropper shape, opaque obfuscated payload, and metadata impersonation together are the install-time-RCE fingerprint: installing this package auto-executes attacker-controlled, non-inspectable code with the installer's privileges.\n\nAny computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.","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 tslint-folder-schema (npm)","id":"MAL-2026-11988","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":"tslint-folder-schema","purl":"pkg:npm/tslint-folder-schema","source":"MAL-2026-11988"}],"products":null,"published":"2026-08-04","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-2026-11988/"}