{"id":"CVE-2026-110600","summary":"xlsxio through 0.2.37 NULL Pointer Dereference via Worksheet Relationship Without Id","details":"xlsxio through 0.2.37 contains a NULL pointer dereference vulnerability in main_sheet_get_sheetfile_expat_callback_element_start() in lib/xlsxio_read.c that allows attackers to crash applications via crafted files. Attackers can supply a .xlsx file whose workbook.xml.rels contains a worksheet Relationship lacking an Id attribute, crashing the process when xlsxioread_sheet_open() is called.","modified":"2026-10-17T02:30:15.923510799Z","published":"2026-10-14T14:16:42.374Z","database_specific":{"cwe_ids":["CWE-476"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110600.json","cna_assigner":"VulnCheck"},"references":[{"type":"WEB","url":"https://github.com"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110600.json"},{"type":"ADVISORY","url":"https://hackmd.io/@haind-pwn/xlsxio-relationship-missing-id-null-deref"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-110600"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/xlsxio-through-0.2.37-null-pointer-dereference-via-worksheet-relationship-without-id"},{"type":"REPORT","url":"https://github.com/brechtsanders/xlsxio/issues/151"},{"type":"PACKAGE","url":"https://github.com/brechtsanders/xlsxio"},{"type":"ARTICLE","url":"https://github.com/brechtsanders/xlsxio/blob/0.2.37/lib/xlsxio_read.c#L851-L866"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/brechtsanders/xlsxio","events":[{"introduced":"0"},{"fixed":"a8b74053127033fcd4788c1a3e651e47c79aa21d"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"0.2.37"},{"fixed":"0.2.37"}],"source":["AFFECTED_FIELD","DESCRIPTION"]}}],"versions":["0.2.36","0.2.35","0.2.34","0.2.33","0.2.32","0.2.31","0.2.29","0.2.28","0.2.27","0.2.26","0.2.25","0.2.24","0.2.22","0.2.21","0.2.19","0.2.18","0.2.16","0.2.15","0.2.14","0.2.13","0.2.12","0.2.11","0.2.10","0.2.8","0.2.7","0.2.6","0.2.5","0.2.3","0.2.2","0.2.1","0.2.0","0.1.9","0.1.8","0.1.7","0.1.6","0.1.5","0.1.4","0.1.3","0.1.2","0.1.1","0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-110600.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}