CVE-2026-77220
🔶 mediumSummary
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.
CVSS Score
6.5
Medium
EPSS Score
0.2
Exploit Probability
Published Date
2026-08-21
First Seen: 2026-08-22
📊 Relative Risk Intelligence
This CVE is Lower Risk - more severe than 46.8% of all 349,016 vulnerabilities in our database.
#185,675
Below average severity
Severity Percentile
🎯 CISA SSVC Assessment Updated: Aug 24, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
NO
Requires human interaction
💥 Technical Impact
Partial
Limited system impact
🏆 Discovered By
Joshua Rogers (AISLE Research)
SSVC data provided by
CISA
Last Modified
2026-08-24
Source
NVD 🔗
CVSS Vector 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CVSS Vector 4.0
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
CWE IDs (Weakness Types)