{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-16560","assignerOrgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","state":"PUBLISHED","assignerShortName":"redhat","dateReserved":"2026-07-22T12:11:52.389Z","datePublished":"2026-07-22T12:51:43.263Z","dateUpdated":"2026-07-22T18:01:52.422Z"},"containers":{"cna":{"title":"389-ds-base: 389-ds-base: heap-buffer-overflow in rdn_av_swap on quoted multivalued rdn","metrics":[{"other":{"content":{"value":"Moderate","namespace":"https://access.redhat.com/security/updates/classification/"},"type":"Red Hat severity rating"}},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"format":"CVSS"}],"descriptions":[{"lang":"en","value":"A heap-buffer-overflow flaw was found in Directory Server (389-ds-base). When a DN contains a legacy-quoted value, the server won't close the heap allocation allowing another call to refer to the same memory pointer causing a denial of service or an arbitrary memory write operation."}],"affected":[{"vendor":"Red Hat","product":"Red Hat Directory Server 11","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"redhat-ds:11/389-ds-base","defaultStatus":"affected","cpes":["cpe:/a:redhat:directory_server:11"]},{"vendor":"Red Hat","product":"Red Hat Directory Server 12","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"redhat-ds:12/389-ds-base","defaultStatus":"affected","cpes":["cpe:/a:redhat:directory_server:12"]},{"vendor":"Red Hat","product":"Red Hat Directory Server 13","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"389-ds-base","defaultStatus":"affected","cpes":["cpe:/a:redhat:directory_server:13"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"389-ds-base","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:10"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 6","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"389-ds-base","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:6"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 7","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"389-ds-base","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:7"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 8","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"389-ds-base","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:8"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"389-ds-base","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:9"]}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-16560","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2506102","name":"RHBZ#2506102","tags":["issue-tracking","x_refsource_REDHAT"]}],"datePublic":"2026-07-22T12:00:00.000Z","problemTypes":[{"descriptions":[{"cweId":"CWE-1220","description":"Insufficient Granularity of Access Control","lang":"en","type":"CWE"}]}],"x_redhatCweChain":"CWE-1220: Insufficient Granularity of Access Control","workarounds":[{"lang":"en","value":"Denial of service is more reliably observed\nwhen heap debugging is enabled (for example AddressSanitizer or MALLOC_CHECK_=3),\nor depending on heap layout and subsequent memory allocator activity. For this\nreason Red Hat rates availability impact as Low (A:L) rather than High.\nThere is no configuration switch to disable DN normalization for client-supplied DNs.\nThe vulnerable code path is present in all currently supported 389-ds-base versions\nthat ship the quoted-RDN parsing logic in dn.c."}],"timeline":[{"lang":"en","time":"2026-07-22T11:59:36.087Z","value":"Reported to Red Hat."},{"lang":"en","time":"2026-07-22T12:00:00.000Z","value":"Made public."}],"credits":[{"lang":"en","value":"Red Hat would like to thank Denis Rastyogin (ALT Linux) for reporting this issue."}],"providerMetadata":{"orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","shortName":"redhat","dateUpdated":"2026-07-22T12:51:43.263Z"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-22T18:01:40.896935Z","id":"CVE-2026-16560","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-22T18:01:52.422Z"}}]}}