{"answers":{"affected":"1 open source package ship an affected version, including @merceas/cross-fetch.","exploited":"There is no known exploitation of MAL-2026-6510 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-2026-6510 is a malicious package in @merceas/cross-fetch, published on 26 Jun 2026."},"fix_prompt":"MAL-2026-6510 is a malicious package: @merceas/cross-fetch (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-2026-6510/ (Markdown: https://insights.sbomify.com/MAL-2026-6510/index.md)","id":"MAL-2026-6510","markdown":"https://insights.sbomify.com/MAL-2026-6510/index.md","name":"MAL-2026-6510","record":{"aliases":[],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"Package is published under the @merceas scope as `cross-fetch` and reuses the upstream cross-fetch README, homepage (github.com/lquixada/cross-fetch), and author metadata to impersonate the legitimate `cross-fetch` package. The package `main`, dist/node-ponyfill.js, contains decoy ponyfill code followed by two obfuscator.io-packed IIFEs that run when the module is `require()`d. The IIFEs dynamically import fs/os/path/https/http/crypto/url/child_process, AES-256-decrypt a URL constructed at runtime from four 32-byte hex Buffers, HTTPS-GET the payload (handling 301/302/303/307/308 redirects with exponential-backoff retries), write it under `os.tmpdir()/\u003cname\u003e-\u003cpid\u003e/`, chmod the file to 0755 (`chmodSync(file, 0o1ed)`), then execute it via `bash -c \u003cfile\u003e` and additionally spawn a detached, `unref()`'d child with `stdio:'ignore'` and `windowsHide:true` for self-respawn / persistence. Obfuscation uses a string-array with numeric-IIFE shift, RC4-keyed base64 lookup, and an anti-tamper RegExp debugger self-test to hide the URL and command strings from static inspection. Importing this package — directly or as a transitive — executes attacker-controlled bytes on the installer's machine in any environment that loads the module (CI, build, production, developer workstation).","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 @merceas/cross-fetch (npm)","id":"MAL-2026-6510","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":"@merceas/cross-fetch","purl":"pkg:npm/%40merceas%2Fcross-fetch","source":"MAL-2026-6510"}],"products":null,"published":"2026-06-26","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-2026-6510/"}