{"answers":{"affected":"1 open source package ship an affected version, including pfa-errors.","exploited":"There is no known exploitation of MAL-2026-12406 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-2026-12406 is a malicious package in pfa-errors, published on 5 Aug 2026."},"fix_prompt":"MAL-2026-12406 is a malicious package: pfa-errors (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-2026-12406/ (Markdown: https://insights.sbomify.com/MAL-2026-12406/index.md)","id":"MAL-2026-12406","markdown":"https://insights.sbomify.com/MAL-2026-12406/index.md","name":"MAL-2026-12406","record":{"aliases":["GHSA-c4mr-v4hr-px3m"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"On require('pfa-errors'), index.js unconditionally loads _runtime.js, which fetches a platform-specific opaque binary from one of three hardcoded Cloudflare workers.dev endpoints (oob-worker.cf100-416.workers.dev and siblings), writes it to a temp path with a decoy name (.cache_\u003chex\u003e or dotnet_diag_\u003chex\u003e.exe), sets mode 0755, and spawns it detached via /bin/sh -c or cmd.exe. When HTTPS is unavailable, a DNS-TXT covert channel to *.dl.well1.site reconstructs the binary from base64 chunks. Destination hostnames and sensitive API names such as child_process and chmodSync are fragmented into arrays and reassembled with.join('') at runtime to evade static string search. A second, functionally identical dropper shipped in lib/telemetry.js is not reached from index.js but embeds the same fetch+chmod+spawn primitives.\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 pfa-errors (npm)","id":"MAL-2026-12406","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":"pfa-errors","purl":"pkg:npm/pfa-errors","source":"MAL-2026-12406"}],"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-2026-12406/"}