{"id":"DEBIAN-CVE-2026-57075","details":"YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via a signed-char lookup-table index in syck_base64dec.  The base64 decoder in the bundled libsyck indexes the 256-entry static table b64_xtable with a signed char, so any !!binary byte \u003e= 0x80 sign-extends to a negative index and reads before the table. The decoder receives the raw bytes of any !!binary node, a standard YAML type not gated by $LoadBlessed or $LoadCode, so it is reached on the default Load path.  Any caller that runs Load or LoadFile on an untrusted document containing a !!binary scalar with a high-bit byte triggers the read, and the value read can surface in the decoded result.","modified":"2026-09-01T16:06:51.930761843Z","published":"2026-07-16T22:17:43.447Z","upstream":["CVE-2026-57075"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-57075"}],"affected":[{"package":{"name":"libyaml-syck-perl","ecosystem":"Debian:12","purl":"pkg:deb/debian/libyaml-syck-perl?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.34-2+deb12u3"}]}],"versions":["1.34-2","1.34-2+deb12u1","1.34-2+deb12u2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-57075.json"}},{"package":{"name":"libyaml-syck-perl","ecosystem":"Debian:13","purl":"pkg:deb/debian/libyaml-syck-perl?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.34-2+deb13u3"}]}],"versions":["1.34-2","1.34-2+deb13u1","1.34-2+deb13u2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-57075.json"}},{"package":{"name":"libyaml-syck-perl","ecosystem":"Debian:14","purl":"pkg:deb/debian/libyaml-syck-perl?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.47-1"}]}],"versions":["1.34-2","1.34-3","1.34-4","1.36-1","1.36-2","1.36-3"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-57075.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"}]}