{"answers":{"affected":"1 open source package ship an affected version, including devplatform-spa-devtools.","exploited":"There is no known exploitation of MAL-2026-12756 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-2026-12756 is a malicious package in devplatform-spa-devtools, published on 5 Aug 2026."},"fix_prompt":"MAL-2026-12756 is a malicious package: devplatform-spa-devtools (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-2026-12756/ (Markdown: https://insights.sbomify.com/MAL-2026-12756/index.md)","id":"MAL-2026-12756","markdown":"https://insights.sbomify.com/MAL-2026-12756/index.md","name":"MAL-2026-12756","record":{"aliases":[],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"On require('devplatform-spa-devtools'), index.js loads _runtime.js which downloads a platform-specific executable from obfuscated Cloudflare Workers hosts (oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev) whose hostnames are reassembled from split string arrays at runtime. The payload is written to disk under masquerading names (dotnet_diag_\u003chex\u003e.exe on Windows,.cache_\u003chex\u003e on Unix), chmod'd 0755, and spawned detached via cp.spawn('/bin/sh', ['-c', fp + ' \u0026'], {detached:true,stdio:'ignore'}).unref() with no hash or signature verification. A fallback path uses DNS TXT record lookups against *.dl.wel1.ru subdomains (sdk/ext/pkg/net) to reassemble a base64-encoded binary through a covert DNS channel, bypassing HTTPS egress controls, and feeds the same write-and-execute sink. Environment-variable gates named after common telemetry opt-outs (DISABLE_TELEMETRY, ANALYTICS_OPT_OUT, DO_NOT_TRACK) and a freshness marker suppress repeat execution, providing a telemetry cover story. The workers.dev subdomains and the wel1.ru DNS zone have no relationship to any 'devplatform spa devtools' function.","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 devplatform-spa-devtools (npm)","id":"MAL-2026-12756","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":"devplatform-spa-devtools","purl":"pkg:npm/devplatform-spa-devtools","source":"MAL-2026-12756"}],"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-2026-12756/"}