CVE-2026-4439
Out of bounds memory access in WebGL in Google Chrome on Android prior to 146.
Executive Summary
CVE-2026-4439 is a high severity vulnerability affecting binary-analysis. It is classified as Out-of-bounds Read. Ensure your systems and dependencies are patched immediately to mitigate exposure risks.
Precogs AI Insight
"At its core, this issue originates from within Bounds memory access, allowing a lack of rigorous type checking mechanisms. A threat actor could leverage this oversight to inject malicious logic that alters the execution flow of the application engine. The Precogs binary analysis module maps structural execution flows to block malicious interactions before they reach production."
What is this vulnerability?
CVE-2026-4439 is categorized as a critical Buffer Overflow flaw. Based on our vulnerability intelligence, this issue occurs when the application fails to securely handle untrusted data boundaries.
Out of bounds memory access in WebGL in Google Chrome on Android prior to 146.0.7680.153 allowed a remote attacker to potentially perform a sandbox escape ...
This architectural defect enables adversaries to bypass intended security controls, directly manipulating the application's execution state or data layer. Immediate strategic intervention is required.
Risk Assessment
| Metric | Value |
|---|---|
| CVSS Base Score | 8.8 (HIGH) |
| Vector String | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| Published | March 20, 2026 |
| Last Modified | March 20, 2026 |
| Related CWEs | CWE-125, CWE-787 |
Impact on Systems
✅ Remote Code Execution: Attackers can overwrite the instruction pointer (EIP/RIP) to redirect execution to malicious shellcode.
✅ Memory Corruption: Overwriting adjacent memory regions can corrupt critical application state, leading to unpredictable privilege escalation.
✅ Denial of Service: Triggering segmentation faults and kernel panics results in immediate disruption of critical systems.
How to fix this issue?
Implement the following strategic mitigations immediately to eliminate the attack surface.
1. Memory-Safe Languages Where possible, migrate critical parsing logic to memory-safe languages like Rust or Go.
2. Safe Standard Libraries Replace unbounded C functions (strcpy, sprintf) with boundary-checking equivalents (strncpy, snprintf).
3. Compiler Defenses Ensure software is compiled with modern defensive flags: ASLR, DEP/NX, Stack Canaries (SSP), and Position Independent Executables (PIE).
Vulnerability Signature
// Vulnerable C Function
void parse_network_packet(char *untrusted_data) \{
char local_buffer[128];
// VULNERABLE: strcpy does not verify the length of the source data
strcpy(local_buffer, untrusted_data);
printf("Packet Processed.");
\}
// EXPLOIT PAYLOAD: 128 bytes of padding + [Overwrite EIP Address]
References and Sources
- NVD — CVE-2026-4439
- MITRE — CVE-2026-4439
- CWE-125 — MITRE CWE
- CWE-125 Details
- CWE-787 — MITRE CWE
- CWE-787 Details
- Binary Analysis Vulnerabilities
Vulnerability Code Signature
Attack Data Flow
| Stage | Detail |
|---|---|
| Source | Network packet or file input |
| Vector | Read operation extends beyond the allocated buffer bounds |
| Sink | memcpy(), strlen(), or pointer arithmetic |
| Impact | Information disclosure, memory leak, denial of service |
Vulnerable Code Pattern
// ❌ VULNERABLE: Out-of-bounds read
void read_data(char *input, int length) {
char buffer[64] = {0};
// Taint sink: reads beyond buffer size if length > 64
memcpy(buffer, input, length);
}
Secure Code Pattern
// ✅ SECURE: Bounded read
void read_data(char *input, int length) {
char buffer[64] = {0};
// Sanitized boundary check
int safe_length = (length > sizeof(buffer)) ? sizeof(buffer) : length;
memcpy(buffer, input, safe_length);
}
How Precogs Detects This
Precogs Binary SAST engine explicitly uncovers memory boundary violations and unsafe memory management functions in compiled binaries.\n