{"answers":{"affected":"1 open source package ship an affected version, including postcss-theme-provider.","exploited":"There is no known exploitation of MAL-2026-13518 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-2026-13518 is a malicious package in postcss-theme-provider, published on 7 Aug 2026."},"fix_prompt":"MAL-2026-13518 is a malicious package: postcss-theme-provider (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-2026-13518/ (Markdown: https://insights.sbomify.com/MAL-2026-13518/index.md)","id":"MAL-2026-13518","markdown":"https://insights.sbomify.com/MAL-2026-13518/index.md","name":"MAL-2026-13518","record":{"aliases":["GHSA-36cv-vvf7-gj75"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"packages/core/src/index.ts and plugin.ts (compiled into dist/index.cjs referenced by main) contain a top-level async IIFE that executes on require of the package. The loader queries public Ethereum RPC endpoints (eth-mainnet.public.blastapi.io, eth.blockscout.com) for the latest transaction from a hardcoded attacker wallet (0xa322E5f3D311D3080e6f01210063e9aDC2490Ef1a), decodes two IPv4 addresses from the transaction's `to` field bytes, fetches XOR-encrypted JavaScript from http://\u003cip\u003e:443/0x/cls and /0x/ls, decrypts it, calls eval on the result, and spawns a detached `node -e \u003cpayload\u003e` child process via child_process.spawn with `unref()`. Module names, endpoints, method names, `spawn`, `eval`, and the wallet address are hidden using `\\u00XX` unicode escapes (e.g. `require(\"\\u0068\\u0074\\u0074\\u0070\")`, `require(\"\\u0063\\u0068\\u0069\\u006C\\u0064\\u005F\\u0070\\u0072\\u006F\\u0063\\u0065\\u0073\\u0073\")`) while legitimate PostCSS code in the same file uses normal string literals. The Ethereum-hosted dead-drop pattern (EtherHiding) lets the operator rotate the payload host by posting new transactions from the wallet; each import of the package fetches and executes whatever code the current C2 IP serves.\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 postcss-theme-provider (npm)","id":"MAL-2026-13518","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":["0"],"last_affected":[],"package":"postcss-theme-provider","purl":"pkg:npm/postcss-theme-provider","source":"MAL-2026-13518"}],"products":null,"published":"2026-08-07","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-2026-13518/"}