CVE-2026-77220: PDFio < 1.6.5 Dangling Pointer via Dictionary String-Formatting
michaelrsweet · pdfio
Fixed in 1.6.5 · Affected: michaelrsweet pdfio before 1.6.5 · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 36% of scored CVEs
DescriptionCVE.org
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.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- michaelrsweet · pdfiobefore 1.6.5
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- michaelrsweet
- Published
- August 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-77220 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.