{"id":"UBUNTU-CVE-2026-26740","details":"Buffer Overflow vulnerability in giflib v.5.2.2 allows a remote attacker to cause a denial of service via the EGifGCBToExtension overwriting an existing Graphic Control Extension block without validating its allocated size.","modified":"2026-07-22T20:45:27.783850615Z","published":"2026-03-18T18:16:00Z","related":["USN-8583-1"],"upstream":["CVE-2026-26740"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-26740"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-26740"},{"type":"REPORT","url":"https://github.com/zakkanijia/POC/blob/main/giflib/giftool/giflib_giftool_gce_len_heap_oobwrite_disclosure.md"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8583-1"}],"affected":[{"package":{"name":"giflib","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/giflib?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.1.6-11","5.1.1-0ubuntu1","5.1.1-0.1","5.1.1-0.2","5.1.2-0.1","5.1.2-0.2","5.1.4-0.3~16.04","5.1.4-0.3~16.04.1","5.1.4-0.3~16.04.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"giflib-tools","binary_version":"5.1.4-0.3~16.04.1+esm1"},{"binary_name":"libgif7","binary_version":"5.1.4-0.3~16.04.1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26740.json"}},{"package":{"name":"giflib","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/giflib?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.1.4-1","5.1.4-2","5.1.4-2ubuntu0.1","5.1.4-2ubuntu0.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"giflib-tools","binary_version":"5.1.4-2ubuntu0.1+esm1"},{"binary_name":"libgif7","binary_version":"5.1.4-2ubuntu0.1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26740.json"}},{"package":{"name":"giflib","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/giflib?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.1.4-3ubuntu1","5.1.9-1","5.1.9-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_version":"5.1.9-1ubuntu0.1","binary_name":"giflib-tools"},{"binary_name":"libgif7","binary_version":"5.1.9-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26740.json"}},{"package":{"name":"giflib","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/giflib?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.1.9-2ubuntu0.3"}]}],"versions":["5.1.9-2build1","5.1.9-2build2","5.1.9-2ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_version":"5.1.9-2ubuntu0.3","binary_name":"giflib-tools"},{"binary_name":"libgif7","binary_version":"5.1.9-2ubuntu0.3"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26740.json"}},{"package":{"name":"giflib","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/giflib?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.2.2-1ubuntu1.2"}]}],"versions":["5.2.1-2.5","5.2.2-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"giflib-tools","binary_version":"5.2.2-1ubuntu1.2"},{"binary_name":"libgif7","binary_version":"5.2.2-1ubuntu1.2"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26740.json"}},{"package":{"name":"giflib","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/giflib?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.2.2-1ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_version":"5.2.2-1ubuntu2","binary_name":"giflib-tools"},{"binary_version":"5.2.2-1ubuntu2","binary_name":"libgif7"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26740.json"}},{"package":{"name":"giflib","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/giflib?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.2.2-1ubuntu3.2"}]}],"versions":["5.2.2-1ubuntu2","5.2.2-1ubuntu3"],"ecosystem_specific":{"binaries":[{"binary_version":"5.2.2-1ubuntu3.2","binary_name":"giflib-tools"},{"binary_name":"libgif7","binary_version":"5.2.2-1ubuntu3.2"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26740.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}