{"answers":{"affected":"1 open source package ship an affected version, including dolyame-ui-calendar.","exploited":"There is no known exploitation of MAL-2026-13140 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-2026-13140 is a malicious package in dolyame-ui-calendar, published on 5 Aug 2026."},"fix_prompt":"MAL-2026-13140 is a malicious package: dolyame-ui-calendar (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-2026-13140/ (Markdown: https://insights.sbomify.com/MAL-2026-13140/index.md)","id":"MAL-2026-13140","markdown":"https://insights.sbomify.com/MAL-2026-13140/index.md","name":"MAL-2026-13140","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 advertises itself as a zero-dependency React calendar component library, but on require() of index.js it loads _shim.js, which selects a platform-specific path, fetches an opaque binary from obfuscated Cloudflare Workers hosts (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev — hostnames assembled via array-join to evade string scanners), writes it to a hidden temp file, chmods 0755, and spawns it detached via /bin/sh -c on POSIX or cmd.exe /c start /b on Windows. A fallback path resolves DNS TXT records at c.\u003cdomain\u003e and 0..N.\u003cdomain\u003e under sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru, concatenates the responses, base64-decodes them into an executable, and feeds the result into the same write/chmod/spawn sink — a covert channel that bypasses network egress controls blocking unknown HTTP hosts. Additional evasion appears in lib/telemetry.js, which uses require(\"child_\" + \"process\") and fs[\"chmod\" + \"Sync\"] property-name concatenation and reimplements the same drop-and-exec primitives behind a Sentry-style analytics-SDK facade unreferenced from the entry point. Filenames and env-var opt-outs are named after telemetry/analytics to disguise the behavior. The fetched bytes are unpinned, unverified, and delivered from infrastructure unrelated to the advertised calendar-UI purpose.","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 dolyame-ui-calendar (npm)","id":"MAL-2026-13140","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":"dolyame-ui-calendar","purl":"pkg:npm/dolyame-ui-calendar","source":"MAL-2026-13140"}],"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-2026-13140/"}