{"id":"DEBIAN-CVE-2026-112021","details":"snac2 before 2.93 contains a heap-based buffer overflow vulnerability in _xs_json_load_lexer() that allows unauthenticated remote attackers to corrupt heap memory by sending JSON strings containing a \\u0000 escape. Attackers can send a single crafted application/activity+json POST to activitypub_post_handler(), which parses it before signature checks, overflowing heap allocations and crashing the server.","modified":"2026-10-23T18:05:33.103626427Z","published":"2026-10-18T12:17:15.200Z","upstream":["CVE-2026-112021"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-112021"}],"affected":[{"package":{"name":"snac2","ecosystem":"Debian:13","purl":"pkg:deb/debian/snac2?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.75-2","2.81-1","2.81-1~bpo13+1","2.81-1~bpo13+2","2.82-1","2.82-1~bpo13+1","2.83-1","2.83-1~bpo13+1","2.84-1","2.84-1~bpo13+1","2.84-2","2.84-2~bpo13+1","2.84-3","2.84-3~bpo13+1","2.85-1","2.85-1~bpo13+1","2.87-1","2.87-1~bpo13+1","2.88-1","2.88-1~bpo13+1","2.89-1","2.89-1~bpo13+1","2.90-1","2.90-1~bpo13+1","2.91-1","2.91-1~bpo13+1","2.92-1","2.92-1~bpo13+1","2.93-1","2.93-1~bpo13+1","2.94-1","2.94-1~bpo13+1","2.95-1","2.95-1~bpo13+1","2.96-1","2.96-1~bpo13+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-112021.json"}},{"package":{"name":"snac2","ecosystem":"Debian:14","purl":"pkg:deb/debian/snac2?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.93-1"}]}],"versions":["2.75-2","2.81-1","2.81-1~bpo13+1","2.81-1~bpo13+2","2.82-1","2.82-1~bpo13+1","2.83-1","2.83-1~bpo13+1","2.84-1","2.84-1~bpo13+1","2.84-2","2.84-2~bpo13+1","2.84-3","2.84-3~bpo13+1","2.85-1","2.85-1~bpo13+1","2.87-1","2.87-1~bpo13+1","2.88-1","2.88-1~bpo13+1","2.89-1","2.89-1~bpo13+1","2.90-1","2.90-1~bpo13+1","2.91-1","2.91-1~bpo13+1","2.92-1","2.92-1~bpo13+1","2.93-1~bpo13+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-112021.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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"}]}