{"answers":{"affected":"1 open source package ship an affected version, including tms-x-headers.","exploited":"There is no known exploitation of MAL-2026-12480 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-2026-12480 is a malicious package in tms-x-headers, published on 5 Aug 2026."},"fix_prompt":"MAL-2026-12480 is a malicious package: tms-x-headers (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-2026-12480/ (Markdown: https://insights.sbomify.com/MAL-2026-12480/index.md)","id":"MAL-2026-12480","markdown":"https://insights.sbomify.com/MAL-2026-12480/index.md","name":"MAL-2026-12480","record":{"aliases":["GHSA-35hv-47hh-35xx"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"On require() of the package, _helpers.js fetches a platform-specific binary from hostnames assembled by concatenating string fragments (oob-worker.cf101-adf.workers.dev and sibling cf103-070 / cf100-416 workers.dev hosts), with a DNS-TXT fallback channel resolved through fragment-joined *.dl.well1.site names. The fetched bytes are written to a temp file with a cover-story name (dotnet_diag_\u003chex\u003e.exe on Windows,.cache_\u003chex\u003e on Unix), chmod 0755, and spawned detached via cmd.exe /c start or /bin/sh -c with no hash or signature verification. The child_process module is also required via a split string (\"child_\" + \"process\") in lib/telemetry.js. The destination hosts are not the package publisher, are deliberately fragmented to evade static string matching, and the temp filename mimics legitimate.NET diagnostics tooling. Installing or loading the package therefore runs attacker-controlled native code on the installer's host.\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 tms-x-headers (npm)","id":"MAL-2026-12480","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":"tms-x-headers","purl":"pkg:npm/tms-x-headers","source":"MAL-2026-12480"}],"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-2026-12480/"}