{"id":"DEBIAN-CVE-2026-118769","details":"Botan is a C++ cryptography library. From 2.1.0 until 3.13.0, the Botan C API function botan_block_cipher_block_size converted a size_t block size to int without a bounds check. In an application that accepts external algorithm parameter strings and uses the FFI raw ECB mode, an attacker can select the variable-block-size Lion cipher so that the reported size is truncated, the caller allocates insufficient memory, and later block processing causes memory corruption. The C++ API and normally used C API modes such as CBC and CTR are unaffected. This issue is fixed in version 3.13.0.","modified":"2026-10-31T21:00:07.289018775Z","published":"2026-10-29T18:17:29.180Z","upstream":["CVE-2026-118769"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-118769"}],"affected":[{"package":{"name":"botan","ecosystem":"Debian:12","purl":"pkg:deb/debian/botan?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.19.3+dfsg-1","2.19.3+dfsg-1+deb12u1","2.19.4+dfsg-1","2.19.5+dfsg-1","2.19.5+dfsg-2","2.19.5+dfsg-3","2.19.5+dfsg-4"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-118769.json"}},{"package":{"name":"botan","ecosystem":"Debian:13","purl":"pkg:deb/debian/botan?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.19.5+dfsg-4"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-118769.json"}},{"package":{"name":"botan3","ecosystem":"Debian:13","purl":"pkg:deb/debian/botan3?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.10.0+dfsg-1","3.10.0+dfsg-2","3.11.0+dfsg-1","3.11.1+dfsg-1","3.11.1+dfsg-2","3.12.0+dfsg-1","3.12.0+dfsg-2","3.12.0+dfsg-2~deb13u1","3.13.0+dfsg-1","3.13.0+dfsg-2","3.7.1+dfsg-2","3.8.1+dfsg-1","3.9.0+dfsg-1","3.9.0+dfsg-2","3.9.0+dfsg-2.1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-118769.json"}},{"package":{"name":"botan3","ecosystem":"Debian:14","purl":"pkg:deb/debian/botan3?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.13.0+dfsg-2"}]}],"versions":["3.10.0+dfsg-1","3.10.0+dfsg-2","3.11.0+dfsg-1","3.11.1+dfsg-1","3.11.1+dfsg-2","3.12.0+dfsg-1","3.12.0+dfsg-2","3.12.0+dfsg-2~deb13u1","3.13.0+dfsg-1","3.7.1+dfsg-2","3.8.1+dfsg-1","3.9.0+dfsg-1","3.9.0+dfsg-2","3.9.0+dfsg-2.1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-118769.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/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"}]}