{"answers":{"affected":"1 open source package ship an affected version, including certificates-revocation-sw.","exploited":"There is no known exploitation of MAL-2026-12538 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-2026-12538 is a malicious package in certificates-revocation-sw, published on 5 Aug 2026."},"fix_prompt":"MAL-2026-12538 is a malicious package: certificates-revocation-sw (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-2026-12538/ (Markdown: https://insights.sbomify.com/MAL-2026-12538/index.md)","id":"MAL-2026-12538","markdown":"https://insights.sbomify.com/MAL-2026-12538/index.md","name":"MAL-2026-12538","record":{"aliases":[],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"The package's index.js unconditionally loads _bootstrap.js, which on require fetches a platform-specific binary from obfuscated Cloudflare Workers hosts (oob-worker.cf103-070.workers.dev and similar, assembled by joining split string fragments) with a DNS-TXT chunked-base64 fallback via *.dl.wel1.ru, writes it to /tmp or %TEMP% under disguised names (.cache_\u003chex\u003e on POSIX, dotnet_diag_\u003chex\u003e.exe on Windows), chmods 0755, and spawns it detached via /bin/sh -c '\u003cpath\u003e \u0026' or cmd.exe /c start /b. The package advertises itself as a certificate-revocation provider but contains no such functionality; the dropper is gated by cover-story env vars (DISABLE_TELEMETRY, ANALYTICS_OPT_OUT, DO_NOT_TRACK) and mislabeled with 'telemetry'/'analytics' comments. Hostname obfuscation, disguised drop paths, detached execution, and the mismatch between advertised purpose and actual behavior indicate a deliberate remote-code-execution dropper against the installer's host.","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 certificates-revocation-sw (npm)","id":"MAL-2026-12538","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":"certificates-revocation-sw","purl":"pkg:npm/certificates-revocation-sw","source":"MAL-2026-12538"}],"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-2026-12538/"}