CVE-2026-45612 in rz-libdemangle
Summary
by MITRE • 07/16/2026
rz-libdemangle is a Rizin library for demangling symbols. Prior to 6bf56d3, the Rust demangler in src/rust/rust_v0.c can perform an out-of-bounds read when the demangler structure is not yet initialized. This issue is fixed in commit 6bf56d3.
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Analysis
by VulDB Data Team • 07/16/2026
The rz-libdemangle library serves as a critical component within the Rizin reverse engineering framework, providing symbol demangling capabilities for various programming languages including Rust. This functionality enables analysts and security researchers to interpret mangled symbol names that arise from compiler optimizations and name mangling schemes used by different languages. The vulnerability exists specifically within the Rust demangler implementation located in the src/rust/rust_v0.c source file, representing a fundamental flaw in how the demangler handles uninitialized structures during the symbol processing workflow.
The technical flaw manifests as an out-of-bounds read condition that occurs when the Rust demangler structure fails to initialize properly before being accessed. This type of vulnerability falls under the category of uninitialized memory access patterns that can lead to information disclosure or potential exploitation. The out-of-bounds read vulnerability typically arises when code attempts to access memory locations beyond the allocated boundaries of a data structure, potentially reading sensitive data from adjacent memory regions or causing program instability. This issue represents a classic example of improper initialization followed by unchecked memory access, which aligns with common software security weaknesses documented in CWE-457 and CWE-460 categories.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can potentially expose sensitive data residing in adjacent memory locations or provide attackers with insights into the program's memory layout. In the context of reverse engineering tools like Rizin, where analysts often work with potentially malicious binaries, such a vulnerability could be exploited to gain additional information about the target system or application state. The flaw becomes particularly concerning when considering that Rizin is frequently used in security research and penetration testing environments where the integrity of the analysis tools themselves must be maintained.
The fix implemented in commit 6bf56d3 addresses this vulnerability by ensuring proper initialization of the demangler structure before any access operations occur. This remediation follows established secure coding practices that emphasize the importance of initializing data structures before use, a principle that aligns with defense-in-depth strategies recommended in various security frameworks including those referenced in the MITRE ATT&CK framework for software exploitation techniques. The fix demonstrates a proactive approach to vulnerability management within open source security tools, where timely patching is crucial for maintaining the integrity of reverse engineering environments.
Security practitioners should consider this vulnerability as part of their broader assessment of Rizin's security posture, particularly when deploying the tool in environments where it processes untrusted input or when conducting security research on potentially malicious code. The vulnerability also highlights the importance of proper memory management practices in security-sensitive applications and serves as a reminder that even seemingly benign functionality can contain critical flaws when not properly implemented with security considerations in mind. Organizations utilizing Rizin for security analysis should ensure they are running patched versions of the library to prevent potential exploitation of this uninitialized memory access flaw.