CVE-2026-52757 Overview
CVE-2026-52757 is a heap use-after-free vulnerability [CWE-416] in Ghidra versions prior to 12.1. The flaw resides in the decompiler's HighVariable::merge() function during the variable merging pass. An attacker can craft a malicious binary that causes stale pointers in the HighIntersectTest::highedgemap cache to be dereferenced. When a user opens the crafted binary in Ghidra's decompiler view, the vulnerable code reads and writes the flags field of freed heap memory. Exploitation requires local user interaction because the analyst must load the attacker-controlled binary into Ghidra.
Critical Impact
Opening a crafted binary in Ghidra's decompiler triggers a heap use-after-free that can corrupt memory and affect reverse-engineering workflows.
Affected Products
- Ghidra versions prior to 12.1
- National Security Agency (NSA) Ghidra Software Reverse Engineering Framework
- Decompiler component (HighVariable::merge())
Discovery Timeline
- 2026-06-10 - CVE-2026-52757 published to NVD
- 2026-06-10 - Last updated in NVD database
Technical Details for CVE-2026-52757
Vulnerability Analysis
The vulnerability is a heap use-after-free in Ghidra's decompiler module. During decompilation, Ghidra performs a variable merging pass that consolidates related high-level variables (HighVariable objects) representing reconstructed program state. The HighIntersectTest::highedgemap structure caches edge relationships between these variables.
When specific control-flow and variable layouts appear in an input binary, entries in the cache retain pointers to HighVariable instances that have already been freed. The HighVariable::merge() function subsequently dereferences these stale pointers and accesses the flags field of the freed allocation. This produces both an out-of-bounds read and write into reclaimed heap memory.
Because Ghidra is written primarily in Java with a native C++ decompiler backend, the memory corruption occurs in the native decompiler process. The impact is bounded to local interactions where an analyst opens an attacker-supplied binary.
Root Cause
The root cause is improper lifecycle management of HighVariable objects relative to entries in HighIntersectTest::highedgemap. The cache is not invalidated when underlying objects are deallocated during the merging pass, leaving dangling pointers that are later dereferenced.
Attack Vector
Exploitation requires an analyst to open a maliciously crafted binary in Ghidra and invoke the decompiler view. The attack vector is local and depends on user interaction. There is no network-reachable component, and no published proof-of-concept or in-the-wild exploitation has been reported.
The vulnerability mechanism is described in prose because no verified exploit code is publicly available. See the GitHub Security Advisory and VulnCheck Advisory for additional technical context.
Detection Methods for CVE-2026-52757
Indicators of Compromise
- Unexpected crashes or segmentation faults in the Ghidra decompiler process (decompile binary) when analyzing untrusted samples
- Heap corruption signatures reported by AddressSanitizer or system crash dumps tied to HighVariable::merge() frames
- Anomalous child processes spawned by the Ghidra JVM following decompilation of an unknown binary
Detection Strategies
- Monitor analyst workstations for crashes of Ghidra's native decompiler subprocess correlated with sample-handling activity
- Track loading of binaries from untrusted sources into reverse-engineering tools using endpoint telemetry
- Apply file-reputation and sandboxing controls to samples before they reach analyst tooling
Monitoring Recommendations
- Enable verbose logging in Ghidra and capture decompiler exit codes for triage
- Alert on Ghidra installations running versions earlier than 12.1 across analyst endpoints
- Review process telemetry on malware analysis hosts for memory-corruption indicators tied to the decompiler
How to Mitigate CVE-2026-52757
Immediate Actions Required
- Upgrade all Ghidra installations to version 12.1 or later
- Restrict use of pre-12.1 Ghidra builds to isolated, non-production analysis environments
- Treat untrusted binaries as hostile and analyze them inside disposable virtual machines
Patch Information
The vulnerability is fixed in Ghidra 12.1. Refer to the GitHub Security Advisory GHSA-8jqp-qv73-395r for the official patch details and release notes.
Workarounds
- Avoid opening untrusted binaries in Ghidra's decompiler view until upgrading to 12.1
- Run Ghidra inside a sandboxed virtual machine with no access to sensitive credentials or networks
- Apply least-privilege controls so analyst accounts cannot reach production systems from analysis hosts
# Verify the installed Ghidra version and upgrade if below 12.1
cat $GHIDRA_INSTALL_DIR/Ghidra/application.properties | grep application.version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
