{"id":"DEBIAN-CVE-2026-77220","details":"PDFio before 1.6.5 contains a dangling pointer vulnerability in the dictionary string-formatting function that stores a pointer to a stack-local buffer in the document dictionary without copying the string value. In multi-threaded or pooled-request environments, attackers or concurrent users can trigger stack memory reuse across requests, causing cross-tenant document content corruption by silently overwriting one caller's dictionary string values with another caller's data.","modified":"2026-09-25T08:47:31.450732777Z","published":"2026-08-21T21:17:06.737Z","upstream":["CVE-2026-77220"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-77220"}],"affected":[{"package":{"name":"ippsample","ecosystem":"Debian:12","purl":"pkg:deb/debian/ippsample?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0.0~git20220215.f365352-1","0.0.0~git20220215.f365352-2","0.0~git20220607.72f89b3-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-77220.json"}},{"package":{"name":"ippsample","ecosystem":"Debian:14","purl":"pkg:deb/debian/ippsample?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0.0~git20220215.f365352-1","0.0.0~git20220215.f365352-2","0.0~git20210916.53e4740-1","0.0~git20210916.53e4740-2","0.0~git20211022.c75af30-1","0.0~git20211022.c75af30-2","0.0~git20220215.f365352-1","0.0~git20220607.72f89b3-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-77220.json"}},{"package":{"name":"pdfio","ecosystem":"Debian:14","purl":"pkg:deb/debian/pdfio?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.5+dfsg-1"}]}],"versions":["1.5.1+dfsg-1","1.6.1+dfsg-1","1.6.1+dfsg-2","1.6.1+dfsg-3","1.6.2+dfsg-1","1.6.3+dfsg-1","1.6.3+dfsg-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-77220.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/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"}]}