{"answers":{"affected":"1 open source package ship an affected version, including postcss-minify-selector.","exploited":"There is no known exploitation of MAL-2026-5837 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-2026-5837 is a malicious package in postcss-minify-selector, published on 15 Jun 2026."},"fix_prompt":"MAL-2026-5837 is a malicious package: postcss-minify-selector (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-2026-5837/ (Markdown: https://insights.sbomify.com/MAL-2026-5837/index.md)","id":"MAL-2026-5837","markdown":"https://insights.sbomify.com/MAL-2026-5837/index.md","name":"MAL-2026-5837","record":{"aliases":["GHSA-gwv6-f7j6-4xc8"],"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 as `postcss-minify-selector` (singular) but its internal postcss plugin identifier is `postcss-minify-selectors` (plural) — the canonical name of the legitimate cssnano plugin. The published name is a one-character deletion from that target. The first executable line of `src/index.js` is a side-effect-only `require('postcss-minify-selector-parser/cjs-runner')` whose return value is discarded and which is not referenced anywhere else in the file; the plugin's actual selector-parsing functionality uses a different subpath, `require('postcss-minify-selector-parser/selector-parser')`, imported separately at line 6. The sibling dependency `postcss-minify-selector-parser` (declared as `^2.0.2` in package.json) is itself a typosquat-shaped name of the well-known `postcss-selector-parser`. The combination — typosquat lure name, plural-vs-singular mismatch with the real cssnano plugin, declared dependency on a second typosquat-shaped package, and an unconditional side-effect require of an otherwise-unused subpath of that dependency at the top of the main entry — is the canonical lure-plus-dropper shape: any consumer that `require()`s this package will silently load and execute whatever the `cjs-runner` module body of the sibling typosquat does at require time.\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 postcss-minify-selector (npm)","id":"MAL-2026-5837","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":["0"],"last_affected":[],"package":"postcss-minify-selector","purl":"pkg:npm/postcss-minify-selector","source":"MAL-2026-5837"}],"products":null,"published":"2026-06-15","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-2026-5837/"}