{"id":"CVE-2026-122330","aliases":["AZL-112694","DEBIAN-CVE-2026-122330","EUVD-2026-117538","GHSA-99fx-294r-j6xw","UBUNTU-CVE-2026-122330"],"status":"published","title":"Blosc c-blosc2 before 3.5.0 Divide-by-Zero via blosc2_schunk_get_slice_buffer()","description":"Blosc c-blosc2 before 3.5.0 contains a divide-by-zero vulnerability in blosc2_schunk_get_slice_buffer() in blosc/schunk.c that allows attackers to crash applications by supplying crafted frames with unchecked zero chunksize or blocksize values. Attackers can provide a malicious Blosc2 frame opened via blosc2_schunk_open() or blosc2_schunk_from_buffer() and read as a slice, raising SIGFPE and terminating the process.","severity":{"version":"4.0","score":6.8,"vector":"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00237,"percentile":0.14897,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-369"],"published":"2026-11-05T15:11:48Z","modified":"2026-11-07T22:00:06Z","affected":[{"source":"osv","ecosystem":"Azure Linux:3","package":"blosc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.21.6-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"c-blosc2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.17.1+ds-1","2.17.1+ds-2","2.22.0+ds-1","2.22.0+ds-1~exp1","2.23.0+ds-1","2.23.0+ds-1~exp1","2.23.0+ds-1~exp2","2.23.1+ds-1","2.23.1+ds-2","3.1.5-1~exp1","3.2.3-1~exp1","3.3.5-1","3.3.5-1~exp1","3.4.1-1"]},{"source":"osv","ecosystem":"Debian:14","package":"c-blosc2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.17.1+ds-1","2.17.1+ds-2","2.22.0+ds-1","2.22.0+ds-1~exp1","2.23.0+ds-1","2.23.0+ds-1~exp1","2.23.0+ds-1~exp2","2.23.1+ds-1","2.23.1+ds-2","3.1.5-1~exp1","3.2.3-1~exp1","3.3.5-1","3.3.5-1~exp1","3.4.1-1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"c-blosc2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.12.0+ds-1","2.12.0+ds-2","2.13.1+ds-1","2.13.1+ds-1ubuntu1","2.13.1+ds-1.1ubuntu1","2.13.1+ds-1.1ubuntu2"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"c-blosc2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.23.0+ds-1","2.23.1+ds-1","2.23.1+ds-2"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"c-blosc2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.17.1+ds-2","2.22.0+ds-1","2.23.0+ds-1"]}],"products":[{"vendor":"blosc","product":"c-blosc2"}],"references":[{"url":"https://github.com/Blosc/c-blosc2/issues/834","tags":["issue-tracking","report"]},{"url":"https://github.com/Blosc/c-blosc2/commit/4fff1787408d94b895c6f9cb50f7925ad5919052","tags":["patch","fix","report"]},{"url":"https://github.com/Blosc/c-blosc2/blob/v3.4.1/blosc/schunk.c#L1662-L1700","tags":["technical-description","article","report"]},{"url":"https://github.com/Blosc/c-blosc2/blob/v3.4.1/blosc/frame.c#L1214-L1227","tags":["technical-description","article","report"]},{"url":"https://hackmd.io/@haindpwn/c-blosc2-schunk-slice-divide-by-zero","tags":["third-party-advisory","advisory","report"]},{"url":"https://github.com/Blosc/c-blosc2","tags":["product","package","report"]},{"url":"https://www.vulncheck.com/advisories/blosc-c-blosc2-before-3.5.0-divide-by-zero-via-blosc2-schunk-get-slice-buffer","tags":["third-party-advisory","advisory","report"]},{"url":"https://hackmd.io/@haindpwn/cve-2026-122330-c-blosc2-schunk-slice-divide-by-zero","tags":["exploit","evidence","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-122330","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-99fx-294r-j6xw"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/122xxx/CVE-2026-122330.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-122330","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-122330","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-122330","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-122330","title":"Blosc c-blosc2 before 3.5.0 Divide-by-Zero via blosc2_schunk_get_slice_buffer()","description":"Blosc c-blosc2 before 3.5.0 contains a divide-by-zero vulnerability in blosc2_schunk_get_slice_buffer() in blosc/schunk.c that allows attackers to crash applications by supplying crafted frames with unchecked zero chunksize or blocksize values. Attackers can provide a malicious Blosc2 frame opened via blosc2_schunk_open() or blosc2_schunk_from_buffer() and read as a slice, raising SIGFPE and terminating the process.","status":"published","published":"2026-11-05T15:11:48.557Z","modified":"2026-11-05T20:42:34.933Z","cvss":[{"version":"4.0","score":6.8,"vector":"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","level":"medium","assessor":"cna"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-369"],"updated_at":"2026-11-05T21:25:05.838392Z"}],"euvd":[{"id":"EUVD-2026-117538","description":"Blosc c-blosc2 before 3.5.0 contains a divide-by-zero vulnerability in blosc2_schunk_get_slice_buffer() in blosc/schunk.c that allows attackers to crash applications by supplying crafted frames with unchecked zero chunksize or blocksize values. Attackers can provide a malicious Blosc2 frame opened via blosc2_schunk_open() or blosc2_schunk_from_buffer() and read as a slice, raising SIGFPE and terminating the process.","status":"published","published":"2026-11-05T15:11:48Z","modified":"2026-11-05T20:42:34Z","cvss":[{"version":"4.0","score":6.8,"vector":"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","level":"medium"}],"updated_at":"2026-11-05T22:02:10.222428Z"}],"ghsa":[{"id":"GHSA-99fx-294r-j6xw","title":"Blosc c-blosc2 before 3.5.0 contains a divide-by-zero vulnerability in...","description":"Blosc c-blosc2 before 3.5.0 contains a divide-by-zero vulnerability in blosc2_schunk_get_slice_buffer() in blosc/schunk.c that allows attackers to crash applications by supplying crafted frames with unchecked zero chunksize or blocksize values. Attackers can provide a malicious Blosc2 frame opened via blosc2_schunk_open() or blosc2_schunk_from_buffer() and read as a slice, raising SIGFPE and terminating the process.","status":"published","published":"2026-11-05T18:33:13Z","modified":"2026-11-05T21:34:50Z","cvss":[{"version":"4.0","score":6.8,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-369"],"updated_at":"2026-11-05T21:56:36.974002Z"}],"nvd":[{"id":"CVE-2026-122330","description":"Blosc c-blosc2 before 3.5.0 contains a divide-by-zero vulnerability in blosc2_schunk_get_slice_buffer() in blosc/schunk.c that allows attackers to crash applications by supplying crafted frames with unchecked zero chunksize or blocksize values. Attackers can provide a malicious Blosc2 frame opened via blosc2_schunk_open() or blosc2_schunk_from_buffer() and read as a slice, raising SIGFPE and terminating the process.","status":"published","published":"2026-11-05T16:17:46.197Z","modified":"2026-11-12T21:30:23.87Z","cvss":[{"version":"4.0","score":6.8,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-369"],"updated_at":"2026-11-12T23:33:07.379475Z"}],"osv":[{"id":"CVE-2026-122330","title":"Blosc c-blosc2 before 3.5.0 Divide-by-Zero via blosc2_schunk_get_slice_buffer()","description":"Blosc c-blosc2 before 3.5.0 contains a divide-by-zero vulnerability in blosc2_schunk_get_slice_buffer() in blosc/schunk.c that allows attackers to crash applications by supplying crafted frames with unchecked zero chunksize or blocksize values. Attackers can provide a malicious Blosc2 frame opened via blosc2_schunk_open() or blosc2_schunk_from_buffer() and read as a slice, raising SIGFPE and terminating the process.","status":"published","published":"2026-11-05T15:11:48.557Z","modified":"2026-11-07T07:02:57.221361296Z","cvss":[{"version":"4.0","score":6.8,"vector":"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","level":"medium"}],"cwes":["CWE-369"],"updated_at":"2026-11-07T03:08:01.726202Z"},{"id":"DEBIAN-CVE-2026-122330","description":"Blosc c-blosc2 before 3.5.0 contains a divide-by-zero vulnerability in blosc2_schunk_get_slice_buffer() in blosc/schunk.c that allows attackers to crash applications by supplying crafted frames with unchecked zero chunksize or blocksize values. Attackers can provide a malicious Blosc2 frame opened via blosc2_schunk_open() or blosc2_schunk_from_buffer() and read as a slice, raising SIGFPE and terminating the process.","status":"published","published":"2026-11-05T16:17:46.197Z","modified":"2026-11-07T22:00:06.90491189Z","cvss":[{"version":"4.0","score":6.8,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"}],"updated_at":"2026-11-07T22:24:12.569307Z"},{"id":"UBUNTU-CVE-2026-122330","description":"Blosc c-blosc2 before 3.5.0 contains a divide-by-zero vulnerability in blosc2_schunk_get_slice_buffer() in blosc/schunk.c that allows attackers to crash applications by supplying crafted frames with unchecked zero chunksize or blocksize values. Attackers can provide a malicious Blosc2 frame opened via blosc2_schunk_open() or blosc2_schunk_from_buffer() and read as a slice, raising SIGFPE and terminating the process.","status":"published","published":"2026-11-06T00:00:00Z","modified":"2026-11-07T01:46:28.962479801Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"},{"version":"4.0","score":6.8,"vector":"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","level":"medium"}],"updated_at":"2026-11-07T01:56:47.245871Z"},{"id":"AZL-112694","title":"CVE-2026-122330 affecting package blosc 1.21.6-1","description":"Blosc c-blosc2 before 3.5.0 contains a divide-by-zero vulnerability in blosc2_schunk_get_slice_buffer() in blosc/schunk.c that allows attackers to crash applications by supplying crafted frames with unchecked zero chunksize or blocksize values. Attackers can provide a malicious Blosc2 frame opened via blosc2_schunk_open() or blosc2_schunk_from_buffer() and read as a slice, raising SIGFPE and terminating the process.","status":"published","published":"2026-11-05T16:17:46Z","modified":"2026-11-06T14:17:03.906621336Z","updated_at":"2026-11-06T14:57:15.495576Z"}]}}