{"id":"CVE-2026-122054","aliases":["DEBIAN-CVE-2026-122054","EUVD-2026-117002","GHSA-5wwm-g25c-cpx8","UBUNTU-CVE-2026-122054"],"status":"published","title":"BIG-HKSCS decoding hang on crafted input","description":"Converting crafted BIG-HKSCS input to UCS-4 or the internal wide character encoding, for example with iconv, in the GNU C Library version 2.18 through 2.31 may result in the converter making no progress, causing the calling application to hang.","severity":{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00446,"percentile":0.39295,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-835"],"published":"2026-11-04T00:00:00Z","modified":"2026-11-06T01:00:36Z","fixes":[{"ecosystem":"Debian:12","package":"glibc","fixed_in":["2.32-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"glibc","fixed_in":["2.32-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"glibc","fixed_in":["2.32-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"glibc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.32-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"glibc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.32-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"glibc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.32-1"}]}]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"glibc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.21-0ubuntu4","2.21-0ubuntu5","2.21-0ubuntu6","2.23-0ubuntu1","2.23-0ubuntu2","2.23-0ubuntu3","2.23-0ubuntu4","2.23-0ubuntu5","2.23-0ubuntu6","2.23-0ubuntu7","2.23-0ubuntu9","2.23-0ubuntu10","2.23-0ubuntu11","2.23-0ubuntu11.2","2.23-0ubuntu11.3","2.23-0ubuntu11.3+esm1","2.23-0ubuntu11.3+esm2","2.23-0ubuntu11.3+esm3","2.23-0ubuntu11.3+esm5","2.23-0ubuntu11.3+esm6","2.23-0ubuntu11.3+esm7","2.23-0ubuntu11.3+esm8","2.23-0ubuntu11.3+esm9"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"glibc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.26-0ubuntu2","2.26-0ubuntu2.1","2.27-0ubuntu2","2.27-0ubuntu3","2.27-3ubuntu1","2.27-3ubuntu1.2","2.27-3ubuntu1.3","2.27-3ubuntu1.4","2.27-3ubuntu1.5","2.27-3ubuntu1.6","2.27-3ubuntu1.6+esm1","2.27-3ubuntu1.6+esm2","2.27-3ubuntu1.6+esm3","2.27-3ubuntu1.6+esm4","2.27-3ubuntu1.6+esm5","2.27-3ubuntu1.6+esm6"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"glibc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.30-0ubuntu2","2.30-0ubuntu3","2.31-0ubuntu5","2.31-0ubuntu6","2.31-0ubuntu7","2.31-0ubuntu9","2.31-0ubuntu9.1","2.31-0ubuntu9.2","2.31-0ubuntu9.3","2.31-0ubuntu9.7","2.31-0ubuntu9.9","2.31-0ubuntu9.12","2.31-0ubuntu9.14","2.31-0ubuntu9.15","2.31-0ubuntu9.16","2.31-0ubuntu9.17","2.31-0ubuntu9.18","2.31-0ubuntu9.18+esm1"]}],"products":[{"vendor":"the gnu c library","product":"glibc"}],"references":[{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=25734","tags":["issue-tracking","report"]},{"url":"https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0026","tags":["vendor-advisory","advisory","report"]},{"url":"http://www.openwall.com/lists/oss-security/2026/11/04/10","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-122054","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-5wwm-g25c-cpx8"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/122xxx/CVE-2026-122054.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-122054","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-122054","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-122054","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-122054","title":"BIG-HKSCS decoding hang on crafted input","description":"Converting crafted BIG-HKSCS input to UCS-4 or the internal wide character encoding, for example with iconv, in the GNU C Library version 2.18 through 2.31 may result in the converter making no progress, causing the calling application to hang.","status":"published","published":"2026-11-04T17:17:38.321Z","modified":"2026-11-09T21:07:52.252Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-835"],"updated_at":"2026-11-09T22:35:08.46461Z"}],"euvd":[{"id":"EUVD-2026-117002","description":"Converting crafted BIG-HKSCS input to UCS-4 or the internal wide character encoding, for example with iconv, in the GNU C Library version 2.18 through 2.31 may result in the converter making no progress, causing the calling application to hang.","status":"published","published":"2026-11-04T17:17:38Z","modified":"2026-11-09T21:07:52Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-09T22:18:21.971974Z"}],"ghsa":[{"id":"GHSA-5wwm-g25c-cpx8","title":"Converting crafted BIG-HKSCS input to UCS-4 or the internal wide character encoding, for example...","description":"Converting crafted BIG-HKSCS input to UCS-4 or the internal wide character encoding, for example with iconv, in the GNU C Library version 2.18 through 2.31 may result in the converter making no progress, causing the calling application to hang.","status":"published","published":"2026-11-04T18:30:55Z","modified":"2026-11-04T21:33:31Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-835"],"updated_at":"2026-11-04T21:42:47.217871Z"}],"nvd":[{"id":"CVE-2026-122054","description":"Converting crafted BIG-HKSCS input to UCS-4 or the internal wide character encoding, for example with iconv, in the GNU C Library version 2.18 through 2.31 may result in the converter making no progress, causing the calling application to hang.","status":"published","published":"2026-11-04T18:17:43.253Z","modified":"2026-11-12T22:09:39.233Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-835"],"updated_at":"2026-11-09T23:16:04.854042Z"}],"osv":[{"id":"CVE-2026-122054","title":"BIG-HKSCS decoding hang on crafted input","description":"Converting crafted BIG-HKSCS input to UCS-4 or the internal wide character encoding, for example with iconv, in the GNU C Library version 2.18 through 2.31 may result in the converter making no progress, causing the calling application to hang.","status":"published","published":"2026-11-04T17:17:38.321Z","modified":"2026-11-11T02:30:40.757118706Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-835"],"updated_at":"2026-11-10T10:57:30.46332Z"},{"id":"DEBIAN-CVE-2026-122054","description":"Converting crafted BIG-HKSCS input to UCS-4 or the internal wide character encoding, for example with iconv, in the GNU C Library version 2.18 through 2.31 may result in the converter making no progress, causing the calling application to hang.","status":"published","published":"2026-11-04T18:17:43.253Z","modified":"2026-11-10T09:47:38.211235986Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-10T10:26:30.347596Z"},{"id":"UBUNTU-CVE-2026-122054","description":"Converting crafted BIG-HKSCS input to UCS-4 or the internal wide character encoding, for example with iconv, in the GNU C Library version 2.18 through 2.31 may result in the converter making no progress, causing the calling application to hang.","status":"published","published":"2026-11-04T00:00:00Z","modified":"2026-11-06T01:00:36.790064827Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"},{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-06T01:33:05.666804Z"}]}}