{"id":"CVE-2026-77220","title":"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","summary":"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 poo…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","cwe":["CWE-825"],"published":"2026-08-21","updated":"2026-09-24","sourceUpdated":"2026-09-24T20:43:32.537","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77220","references":[{"url":"https://github.com/michaelrsweet/pdfio/commit/22b9afc800c5833f9e851e35938972bd4c76a357","label":"disclosure@vulncheck.com"},{"url":"https://github.com/michaelrsweet/pdfio/releases/tag/v1.6.5","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/pdfio-dangling-pointer-via-dictionary-string-formatting","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00421,"epssPercentile":0.3373,"ingestedAt":"2026-09-24T20:51:40.218Z","slug":"CVE-2026-77220","body":"## Overview\n\nPDFio 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}