{"id":"DEBIAN-CVE-2026-4177","details":"YAML::Syck versions through 1.36 for Perl has several potential security vulnerabilities including a high-severity heap buffer overflow in the YAML emitter.  The heap overflow occurs when class names exceed the initial 512-byte allocation.  The base64 decoder could read past the buffer end on trailing newlines.  strtok mutated n-\u003etype_id in place, corrupting shared node data.  A memory leak occurred in syck_hdlr_add_anchor when a node already had an anchor. The incoming anchor string 'a' was leaked on early return.","modified":"2026-09-01T16:06:42.095251640Z","published":"2026-03-16T23:16:21.543Z","upstream":["CVE-2026-4177"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-4177"}],"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+deb12u2"}]}],"versions":["1.34-2","1.34-2+deb12u1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-4177.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+deb13u2"}]}],"versions":["1.34-2","1.34-2+deb13u1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-4177.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":"1.36-2"}]}],"versions":["1.34-2","1.34-3","1.34-4","1.36-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-4177.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"}]}