{"id":"CVE-2026-105280","summary":"Hex writes unverified package tarballs to standard output in mix hex.package fetch","details":"Improper Validation of Integrity Check Value vulnerability in hexpm hex allows a package mirror to substitute the tarball that mix hex.package fetch PACKAGE VERSION --output - writes to standard output.\n\nHex compares a fetched tarball's inner and outer checksums with the repository's signed registry before writing it to a file or unpacking it. The standard output branch of mix hex.package fetch writes the bytes returned by Hex.SCM.fetch/3 without that comparison, and Hex.SCM.fetch/3 doesn't verify freshly downloaded tarballs itself. When a mirror configured with HEX_MIRROR_URL or mirror_url serves altered bytes, the command prints them and exits successfully, while the same fetch with --output FILE fails with a checksum mismatch.\n\nHex also prints diagnostics to standard output while the command runs: the body of a failed HTTP response from the update check or a registry fetch, and API warnings from the x-hex-message header. A mirror that answers one of those requests with an error whose body is a tar archive gets that archive written to standard output ahead of the verified tarball, so a pipeline that unpacks standard output extracts the mirror's files. This happens even when the checksum check then fails, because the archive is already on standard output.\n\nThis issue affects hex: from 0.20.2 before 2.5.2.","aliases":["EEF-CVE-2026-105280","GHSA-98jr-23pm-vj7c"],"modified":"2026-10-13T02:45:32.620344903Z","published":"2026-10-12T15:30:14.126Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105280.json","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0.20.2"},{"fixed":"2.5.2"}]}],"cna_assigner":"EEF","cwe_ids":["CWE-354"]},"references":[{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-105280.html"},{"type":"WEB","url":"https://github.com"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105280.json"},{"type":"PACKAGE","url":"https://github.com/hexpm/hex"},{"type":"FIX","url":"https://github.com/hexpm/hex/commit/69489f8b74213f03db10169e6e5407e6d5fee512"},{"type":"FIX","url":"https://github.com/hexpm/hex/commit/8a14632ca6ba8a8afd2a3f2098bc267c13e13d93"},{"type":"FIX","url":"https://github.com/hexpm/hex/commit/d1f5a085d9d4748e1f7d195e4bc39ebd77c28d9c"},{"type":"ADVISORY","url":"https://github.com/hexpm/hex/security/advisories/GHSA-98jr-23pm-vj7c"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-105280"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-105280"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/hexpm/hex","events":[{"introduced":"d1f5a085d9d4748e1f7d195e4bc39ebd77c28d9c"},{"fixed":"8a14632ca6ba8a8afd2a3f2098bc267c13e13d93"}]}],"versions":["v2.5.1","v2.5.0","v2.2.2","v2.4.2","v2.4.1","v2.4.0","v2.2.1","v2.2.0","v2.0.6","v2.1.1","v0.21.3","v2.1.0","v2.0.5","v2.0.4","v2.0.3","v2.0.2","v2.0.1","v2.0.0","v1.0.1","v1.0.0","v0.21.2","v0.21.1","v0.21.0","v0.20.5","v0.20.4","v0.20.3","v0.20.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-105280.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N"}]}