{"id":"CVE-2026-105768","revision":null,"records":[{"revision":"b8093215a4794fbe96be69dc8cb3a91f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-105768","aliases":[],"title":"apko /etc/passwd and /etc/group UID/GID truncation writes package-supplied entries as root","description":"apko allows users to build and publish OCI container images built from apk packages. From version 0.2.0 to before version 1.4.5, UserEntry.Parse and GroupEntry.Parse in pkg/passwd read the UID and GID fields of /etc/passwd and /etc/group entries with strconv.Atoi and convert them to uint32 without a range check. On 64-bit platforms an out-of-range value such as 4294967296 (2^32) is truncated to 0, and negative values wrap. Because apko parses the passwd and group entries supplied by the packages it installs and writes them back into the image, an attacker who controls a package installed into the image can ship an entry that appears to declare an unprivileged UID or GID but is written into the built image as UID 0 or GID 0 (root). The truncated UID is also used when resolving the image's run-as user. This issue has been fixed in version 1.4.5.","state":0,"publishedAt":"2026-10-05T20:17:46.477+00:00","modifiedAt":"2026-10-06T13:59:32.353+00:00","affected":[{"ecosystem":"https://pkg.go.dev","name":"chainguard.dev/apko","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"chainguard-dev\",\n                    \"product\": \"apko\",\n                    \"collectionURL\": \"https://pkg.go.dev\",\n                    \"packageName\": \"chainguard.dev/apko\",\n                    \"repo\": \"https://github.com/chainguard-dev/apko\",\n                    \"modules\": [\n                        \"pkg/passwd\"\n                    ],\n                    \"programFiles\": [\n                        \"pkg/passwd/passwd.go\",\n                        \"pkg/passwd/group.go\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"passwd.UserEntry.Parse\"\n                        },\n                        {\n                            \"name\": \"passwd.GroupEntry.Parse\"\n                        }\n                    ],\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0.2.0\",\n                            \"lessThan\": \"1.4.5\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N","score":6.3,"severity":"MEDIUM"}],"references":["https://github.com/chainguard-dev/apko/security/advisories/GHSA-rj6x-hwpv-vhvf","https://github.com/chainguard-dev/apko/pull/2516","https://github.com/chainguard-dev/apko/commit/739e7ce3f675ffb232e16849b51ff93657f1570c","https://github.com/chainguard-dev/apko/releases/tag/v1.4.5"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-105768","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-105768","identifiers":["CVE-2026-105768"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-daa70f0e05b540b28ec429806bdccfc4","complete":false,"records":13759,"lastAttemptAt":"2026-11-11T15:09:37.2726122+00:00","lastSuccessAt":"2026-11-11T15:09:37.269+00:00","error":null,"lastVerifiedAt":"2026-11-11T15:09:37.269+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13582,"expectedIdentifiers":13813,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-11T14:57:42.7555955+00:00","complete":true,"records":1097,"lastAttemptAt":"2026-11-11T14:57:42.7555955+00:00","lastSuccessAt":"2026-11-11T14:57:42.9331503+00:00","error":null,"lastVerifiedAt":"2026-11-11T14:57:42.9331505+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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