Dashboard / CVE-2026-77220

CVE-2026-77220

HIGH
MEDIUM Priority: 0.03 BB Relevance: 64/100
Published: 2026-08-21 Modified: 2026-11-08 First seen: 2026-11-08 Status: active

Attack Surface

Network Low Complexity No Interaction Integ. Impact

CVSS Vector Breakdown

AV: Network
AC: Low
PR: Low
UI: None
AT: None
VC: None
VI: High
VA: None

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.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
michaelrsweet pdfio 0 < 1.6.5

References & Advisories (3)

Bug Bounty Relevance

64 / 100
✓ Network accessible
✓ Low complexity
✓ No user interaction

CVSS Score

7.1 / 10.0 v4.0
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

EPSS — Exploitation Probability

0.42%
Raw Score 0.004210
Percentile 37.0%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00421
2026-11-12
0.00421
2026-11-10
0.00421
2026-11-09
0.00421
2026-11-08
0.00421

Intelligence Sources

mitre ref →

External Links