{"id":"CVE-2026-88839","state":"PUBLISHED","title":"Busybox: busybox: passwd/group parser writes heap pointers out of bounds due to stale tokenize() endpoint","description":"BusyBox passwd/group tokenize() references a stale endpoint pointer after trimming, causing an out-of-bounds write of heap pointers.","publishedAt":"2026-09-23T17:45:33.584Z","updatedAt":"2026-09-25T22:28:25.024Z","severity":{"score":6.7,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","source":"redhat"},"assigner":"redhat","products":["Red Hat Red Hat Hardened Images"],"affected":[{"vendor":"Red Hat","product":"Red Hat Hardened Images","packageName":"busybox-main","defaultStatus":"affected","versions":[{"version":"1.37.0-9.1.hum1","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:hummingbird:1"]}],"references":["https://access.redhat.com/errata/RHSA-2026:72111","https://access.redhat.com/security/cve/CVE-2026-88839","https://bugzilla.redhat.com/show_bug.cgi?id=2531353"],"weaknesses":["CWE-787"],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/88xxx/CVE-2026-88839.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-88839","state":"PUBLISHED","datePublished":"2026-09-23T17:45:33.584Z","dateUpdated":"2026-09-25T22:28:25.024Z","assignerShortName":"redhat","assignerOrgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","dateReserved":"2026-09-10T09:42:04.559Z"},"containers":{"cna":{"title":"Busybox: busybox: passwd/group parser writes heap pointers out of bounds due to stale tokenize() endpoint","descriptions":[{"lang":"en","value":"BusyBox passwd/group tokenize() references a stale endpoint pointer after trimming, causing an out-of-bounds write of heap pointers."}],"affected":[{"vendor":"Red Hat","product":"Red Hat Hardened Images","packageName":"busybox-main","defaultStatus":"affected","versions":[{"version":"1.37.0-9.1.hum1","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:hummingbird:1"]}],"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:72111","name":"RHSA-2026:72111","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-88839","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2531353","name":"RHBZ#2531353","tags":["issue-tracking","x_refsource_REDHAT"]}],"metrics":[{"other":{"content":{"value":"Moderate","namespace":"https://access.redhat.com/security/updates/classification/"},"type":"Red Hat severity rating"}},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":6.7,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-787","description":"Out-of-bounds Write","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"redhat","orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","dateUpdated":"2026-09-25T22:28:25.024Z"},"datePublic":"2026-09-23T16:35:00.000Z","x_redhatCweChain":"CWE-787: Out-of-bounds Write","workarounds":[{"lang":"en","value":"Ensure /etc/group and /etc/passwd are writable only by root and protected by mandatory access controls. Monitor these files for unauthorized modifications. Upstream should fix tokenize() to recompute tokenize_end after trimming."}],"timeline":[{"lang":"en","time":"2026-09-09T00:00:00.000Z","value":"Reported to Red Hat."},{"lang":"en","time":"2026-09-23T16:35:00.000Z","value":"Made public."}],"credits":[{"lang":"en","value":"Red Hat would like to thank Shubham Raj (Causal Security) for reporting this issue."}],"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-23T19:19:09.117423Z","id":"CVE-2026-88839","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-23T19:44:12.718Z"}}]}}}