{"id":"CVE-2026-77220","aliases":["DEBIAN-CVE-2026-77220","EUVD-2026-64163","GHSA-2fr4-jfvm-chmp","UBUNTU-CVE-2026-77220"],"status":"published","title":"PDFio \u003c 1.6.5 Dangling Pointer via Dictionary String-Formatting","description":"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.","severity":{"version":"4.0","score":7.1,"vector":"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00421,"percentile":0.3678,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-825"],"published":"2026-08-21T20:54:34Z","modified":"2026-11-08T14:08:56Z","fixes":[{"ecosystem":"Debian:14","package":"pdfio","fixed_in":["1.6.5+dfsg-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"ippsample","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0.0~git20220215.f365352-1","0.0.0~git20220215.f365352-2","0.0~git20220607.72f89b3-1"]},{"source":"osv","ecosystem":"Debian:14","package":"ippsample","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"]},{"source":"osv","ecosystem":"Debian:14","package":"pdfio","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"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"ippsample","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0+20180213-0ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"ippsample","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0+20180213-0ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"ippsample","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0+20180213-0ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"ippsample","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0+20180213-0ubuntu1","0.0+20180213-0ubuntu2","0.0+20180213-0ubuntu3"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"ippsample","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0.0~git20220215.f365352-1build1","0.0.0~git20220215.f365352-2"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"ippsample","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0+20180213-0ubuntu3","0.0.0~git20220215.f365352-1","0.0.0~git20220215.f365352-1build1"]}],"products":[{"vendor":"michaelrsweet","product":"pdfio"}],"references":[{"url":"https://github.com/michaelrsweet/pdfio/releases/tag/v1.6.5","tags":["release-notes","advisory"]},{"url":"https://github.com/michaelrsweet/pdfio/commit/22b9afc800c5833f9e851e35938972bd4c76a357","tags":["patch","fix"]},{"url":"https://www.vulncheck.com/advisories/pdfio-dangling-pointer-via-dictionary-string-formatting","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77220","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-2fr4-jfvm-chmp"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77220.json","tags":["advisory"]},{"url":"https://github.com/michaelrsweet/pdfio","tags":["package"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-77220","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-77220","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-77220","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-77220","title":"PDFio \u003c 1.6.5 Dangling Pointer via Dictionary String-Formatting","description":"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.","status":"published","published":"2026-08-21T20:54:34.762Z","modified":"2026-11-08T14:08:56.091Z","cvss":[{"version":"4.0","score":7.1,"vector":"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","level":"high","assessor":"cna"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-825"],"updated_at":"2026-11-08T15:43:34.234229Z"}],"euvd":[{"id":"EUVD-2026-64163","description":"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.","status":"published","published":"2026-08-21T20:54:34Z","modified":"2026-11-08T14:08:56Z","cvss":[{"version":"4.0","score":7.1,"vector":"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","level":"high"}],"updated_at":"2026-11-08T15:13:06.469155Z"}],"ghsa":[{"id":"GHSA-2fr4-jfvm-chmp","title":"PDFio before 1.6.5 contains a dangling pointer vulnerability in the dictionary string-formatting...","description":"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.","status":"published","published":"2026-08-21T21:31:52Z","modified":"2026-08-21T21:31:59Z","cvss":[{"version":"4.0","score":7.1,"vector":"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","level":"high"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"cwes":["CWE-825"],"updated_at":"2026-11-02T15:10:50.012908Z"}],"nvd":[{"id":"CVE-2026-77220","description":"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.","status":"published","published":"2026-08-21T21:17:06.737Z","modified":"2026-10-12T16:10:00.22Z","cvss":[{"version":"4.0","score":7.1,"vector":"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","level":"high","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-825"],"updated_at":"2026-11-02T14:12:40.665005Z"}],"osv":[{"id":"CVE-2026-77220","title":"PDFio \u003c 1.6.5 Dangling Pointer via Dictionary String-Formatting","description":"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.","status":"published","published":"2026-08-21T20:54:34.762Z","modified":"2026-11-09T07:13:37.198342968Z","cvss":[{"version":"4.0","score":7.1,"vector":"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","level":"high"}],"cwes":["CWE-825"],"updated_at":"2026-11-09T03:16:17.543303Z"},{"id":"DEBIAN-CVE-2026-77220","description":"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.","status":"published","published":"2026-08-21T21:17:06.737Z","modified":"2026-10-13T09:47:30.385520325Z","cvss":[{"version":"4.0","score":7.1,"vector":"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","level":"high"}],"updated_at":"2026-11-02T15:46:03.502256Z"},{"id":"UBUNTU-CVE-2026-77220","description":"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.","status":"published","published":"2026-08-21T21:17:00Z","modified":"2026-10-17T13:01:07.70988458Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium"},{"version":"4.0","score":7.1,"vector":"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","level":"high"}],"updated_at":"2026-11-02T16:57:13.483205Z"}]}}