{"id":"DEBIAN-CVE-2026-57077","details":"YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via an unbounded newline scan in newline_len.  In the bundled libsyck newline_len and is_newline dereference the scan pointer, and the following byte for a \"\\r\\n\" pair, with no NUL-terminator or bounds check. During block-scalar lexing at a document boundary the scan runs one byte past the heap lexer buffer. This is an incomplete fix of CVE-2025-11683, on a lexer path the earlier fix did not cover.  Any caller that runs Load or LoadFile on an untrusted document with a block scalar at a document boundary reaches the over-read.","modified":"2026-09-01T16:06:52.032027398Z","published":"2026-07-16T22:17:43.650Z","upstream":["CVE-2026-57077"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-57077"}],"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-2026-57077.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-2026-57077.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-2026-57077.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"}]}