{"id":"UBUNTU-CVE-2021-26937","details":"encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service (invalid write access and application crash) or possibly have unspecified other impact via a crafted UTF-8 character sequence.","modified":"2026-02-04T02:57:32.343900Z","published":"2021-02-09T20:15:00Z","related":["USN-4747-1","USN-4747-2"],"upstream":["CVE-2021-26937"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-26937"},{"type":"REPORT","url":"https://lists.gnu.org/archive/html/screen-devel/2021-02/msg00000.html"},{"type":"REPORT","url":"https://seclists.org/oss-sec/2021/q1/124"},{"type":"REPORT","url":"https://seclists.org/oss-sec/2021/q1/129"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4747-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4747-2"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-26937"}],"affected":[{"package":{"name":"screen","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/screen@4.1.0~20120320gitdb59704-9ubuntu0.1~esm2?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.1.0~20120320gitdb59704-9ubuntu0.1~esm2"}]}],"versions":["4.0.3-14ubuntu10","4.1.0~20120320gitdb59704-9","4.1.0~20120320gitdb59704-9ubuntu0.1~esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"screen","binary_version":"4.1.0~20120320gitdb59704-9ubuntu0.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-26937.json"}},{"package":{"name":"screen","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/screen@4.3.1-2ubuntu0.1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.1-2ubuntu0.1"}]}],"versions":["4.3.1-2","4.3.1-2build1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"4.3.1-2ubuntu0.1","binary_name":"screen"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-26937.json"}},{"package":{"name":"screen","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/screen@4.6.2-1ubuntu1.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.6.2-1ubuntu1.1"}]}],"versions":["4.6.1-1","4.6.2-1","4.6.2-1ubuntu1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"screen","binary_version":"4.6.2-1ubuntu1.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-26937.json"}},{"package":{"name":"screen","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/screen@4.8.0-1ubuntu0.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.8.0-1ubuntu0.1"}]}],"versions":["4.6.2-3build1","4.7.0-1","4.8.0-1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"4.8.0-1ubuntu0.1","binary_name":"screen"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-26937.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}