{"id":"CVE-2026-81881","summary":"radare2: Heap out-of-bounds read in radare2 Mach-O Swift metadata parser","details":"radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's Mach-O Swift field-metadata parser was vulnerable because a relative Swift field pointer could be lower than the field-metadata section base, making subtraction produce a negative logical index. The vulnerability is triggered by parsing Swift type and class metadata from a crafted Mach-O file. The derived index was used to read four bytes immediately before the allocated field-metadata buffer. This can cause incorrect metadata processing or process termination; no attacker-observable memory disclosure has been demonstrated. This issue is fixed in version 6.2.0.","aliases":["GHSA-q4w7-225g-64j9"],"modified":"2026-09-24T08:26:12.401198Z","published":"2026-09-22T15:05:21.940Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-125","CWE-191"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81881.json"},"references":[{"type":"WEB","url":"https://github.com/radareorg/radare2/releases/tag/6.2.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81881.json"},{"type":"ADVISORY","url":"https://github.com/radareorg/radare2/security/advisories/GHSA-q4w7-225g-64j9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81881"},{"type":"REPORT","url":"https://github.com/radareorg/radare2/issues/26229"},{"type":"FIX","url":"https://github.com/radareorg/radare2/commit/1da6e782df220edf56138ef5fe4f33745b04db74"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/radareorg/radare2","events":[{"introduced":"0"},{"fixed":"1da6e782df220edf56138ef5fe4f33745b04db74"},{"fixed":"e1fc278734ad62f933fc6f91edb29e4ba732f402"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"6.2.0"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["6.1.8","6.1.6","6.1.4","6.1.2","6.1.0","6.0.8","6.0.7","6.0.6","6.0.4","6.0.2","6.0.0","5.9.8","5.9.6","5.9.4","5.9.2","5.9.0","5.8.8","5.8.6","5.8.4","5.8.2","5.8.0","5.7.8","5.7.6","5.7.4","5.7.2","5.7.0","wip","5.6.8","5.6.6","5.6.4","5.6.2","5.6.0","5.5.4","5.5.2","5.5.0","5.4.2","5.4.0","5.4.0-git","5.3.1","5.3.0","5.2.1","5.2.0","5.1.1","5.1.0","release-5.0.0","5.0.0","4.5.1","4.4.0","4.3.1","Continuous-Windows","4.3.0","continuous","4.2.1","4.2.0","4.1.1","4.1.0","4.0.0","3.9.0","3.8.0","3.7.1","3.7.0","3.6.0","3.5.1","3.5.0","3.4.1","3.4.0","3.3.0","3.2.1","3.2.0","3.1.3","3.1.2","3.1.1","3.1.0","3.0.1","3.0.0","2.9.0","2.8.0","2.7.0","2.6.9","2.6.0","2.5.0","2.4.0","2.2.0","2.1.0","2.0.1","2.0.0","1.6.0","1.5.0","1.4.0","1.3.0","1.3.0-git","1.2.0","1.2.0-git","1.1.0","1.0.2","1.0.1","1.0.0","1.0","0.10.6","0.10.5","0.10.4-termux4","termux","0.10.4","0.10.3","0.10.2","0.10.1","0.10.0","radare2-windows-nightly","0.9.9","0.9.8","0.9.8-rc4","0.9.8-rc3","0.9.8-rc2","0.9.8-rc1","0.9.7","0.9.6","0.9.4","0.9.2","0.9","0.8.8","0.8.6"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81881.json","vanir_signatures_modified":"2026-09-24T08:26:12Z","vanir_signatures":[{"target":{"file":"libr/bin/format/objc/mach0_classes.c"},"deprecated":false,"digest":{"line_hashes":["332677270819805383238193717200758279722","295128320059232029929765671829528930204","184627523897319213727199517768688153924","169645158764307019081923382253024254048","73651439494692449067289871383244913788","57332217162829732858398458614447378309","335170221235200083409868854908971301019","194381366707013214646361641159617890892","147272364741087878613388785379098248681","51543663916266712562871821597360225593","146577897530153001026446731945740797379","82623966241928258742206153851855266556","126160771918325133782748840760612042225","303529503061528898905207045138037476960"],"threshold":0.9},"id":"CVE-2026-81881-0389bd40","signature_type":"Line","signature_version":"v1","source":"https://github.com/radareorg/radare2/commit/1da6e782df220edf56138ef5fe4f33745b04db74"},{"id":"CVE-2026-81881-22a5fd39","signature_type":"Function","signature_version":"v1","source":"https://github.com/radareorg/radare2/commit/1da6e782df220edf56138ef5fe4f33745b04db74","target":{"file":"libr/bin/format/objc/mach0_classes.c","function":"parse_type"},"deprecated":false,"digest":{"function_hash":"274122758918572350299791781341132122314","length":4363}}]}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L"}]}