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This issue is not exploitable under Docker, because Docker creates a top-level read-only layer that masks any malicious /dev symlink present in the container image — unlike some other Linux container tooling, whose higher-level runtimes built on runc remain exposed to exploitation via a malicious image. This issue has been fixed in versions 1.3.6, 1.4.3 and 1.5.0.","state":"PUBLISHED","assigner":"GitHub_M","published_at":"2026-07-01 02:17:00","updated_at":"2026-07-02 19:36:49"},"problem_types":["CWE-61","CWE-61 CWE-61: UNIX Symbolic Link (Symlink) Following"],"metrics":[{"version":"3.1","source":"security-advisories@github.com","type":"Secondary","score":"3.3","severity":"LOW","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","baseScore":3.3,"baseSeverity":"LOW","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"3.3","severity":"LOW","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","data":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"NONE","baseScore":3.3,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","version":"3.1"}}],"references":[{"url":"https://github.com/opencontainers/runc/security/advisories/GHSA-xjvp-4fhw-gc47","name":"https://github.com/opencontainers/runc/security/advisories/GHSA-xjvp-4fhw-gc47","refsource":"security-advisories@github.com","tags":["Mitigation","Patch","Vendor Advisory"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/opencontainers/runc/commit/864db8042dbb","name":"https://github.com/opencontainers/runc/commit/864db8042dbb","refsource":"security-advisories@github.com","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-41579","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41579","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"opencontainers","product":"runc","version":"affected < 1.3.6","platforms":[]},{"source":"CNA","vendor":"opencontainers","product":"runc","version":"affected >= 1.4.0-rc.1, < 1.4.3","platforms":[]},{"source":"CNA","vendor":"opencontainers","product":"runc","version":"affected >= 1.5.0-rc.1, < 1.5.0-rc.3","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2026","cve_id":"41579","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"linuxfoundation","cpe5":"runc","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"41579","cve":"CVE-2026-41579","epss":"0.002220000","percentile":"0.126670000","score_date":"2026-07-05","updated_at":"2026-07-06 00:01:20"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-41579","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-07-01T13:34:05.348945Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-07-01T13:35:41.354Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"product":"runc","vendor":"opencontainers","versions":[{"status":"affected","version":"< 1.3.6"},{"status":"affected","version":">= 1.4.0-rc.1, < 1.4.3"},{"status":"affected","version":">= 1.5.0-rc.1, < 1.5.0-rc.3"}]}],"descriptions":[{"lang":"en","value":"runc is a CLI tool for spawning and running containers according to the OCI specification. 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In versions prior to 1.3.6, 1.4.0-rc.1, 1.4.0-rc.12, 1.5.0-rc.1, and 1.5.0-rc.1, when setting up the container rootfs, setupPtmx and setupDevSymlinks call os.Remove and os.Symlink with a filepath.Join string which allow an image with /dev as a symlink to trick runc into deleting files called ptmx on the host or creating a hardcoded set of symlinks with specific names and targets in an arbitrary pre-existing host directory. This issue is not exploitable under Docker, because Docker creates a top-level read-only layer that masks any malicious /dev symlink present in the container image — unlike some other Linux container tooling, whose higher-level runtimes built on runc remain exposed to exploitation via a malicious image. This issue has been fixed in versions 1.3.6, 1.4.3 and 1.5.0.","Type":"Description","Title":"runc: Malicious image with /dev symlink can trigger limited host"}]}}}