CVE-2025-5914 Overview
A critical vulnerability has been identified in the libarchive library, specifically within the archive_read_format_rar_seek_data() function. This flaw involves an integer overflow that can ultimately lead to a double-free condition. Exploiting a double-free vulnerability can result in memory corruption, enabling an attacker to execute arbitrary code or cause a denial-of-service condition. The vulnerability affects the RAR archive format processing functionality, making any application that uses libarchive to handle RAR files potentially vulnerable.
Critical Impact
Remote attackers can exploit this double-free vulnerability via maliciously crafted RAR archives to achieve arbitrary code execution or crash affected systems, potentially compromising data confidentiality, integrity, and availability.
Affected Products
- libarchive libarchive (versions prior to v3.8.0)
- Red Hat OpenShift Container Platform 4.0
- Red Hat Enterprise Linux 6.0, 7.0, 8.0, 9.0, and 10.0
Discovery Timeline
- June 9, 2025 - CVE-2025-5914 published to NVD
- January 15, 2026 - Last updated in NVD database
Technical Details for CVE-2025-5914
Vulnerability Analysis
The vulnerability exists in the archive_read_format_rar_seek_data() function within the libarchive library. When processing RAR archive files, an integer overflow condition can occur during seek operations, which subsequently triggers a double-free memory corruption issue. Double-free vulnerabilities occur when the same memory location is freed twice, corrupting the memory allocator's internal data structures. This corruption can be exploited by attackers to achieve arbitrary code execution by manipulating the heap state to gain control over program execution flow.
The flaw is classified under CWE-415 (Double Free), which represents a dangerous memory safety issue. Applications that process untrusted RAR archives using vulnerable versions of libarchive are at risk. This includes file managers, backup utilities, container platforms, and any other software that relies on libarchive for archive extraction capabilities.
Root Cause
The root cause stems from improper integer handling in the RAR format seek data processing logic. When large or specially crafted offset values are processed, an integer overflow can occur, leading to incorrect memory management calculations. This causes the library to free the same memory block twice, resulting in heap corruption. The vulnerability is triggered during the decompression or reading of malformed RAR archive files where the seek position data has been manipulated to cause the overflow condition.
Attack Vector
An attacker can exploit this vulnerability by crafting a malicious RAR archive file designed to trigger the integer overflow condition. When a victim application using a vulnerable version of libarchive attempts to process this archive, the double-free condition occurs. The attack can be delivered through various vectors:
- Email attachments containing malicious RAR archives
- Downloaded files from untrusted sources
- Archives processed by automated systems (backup software, container builds)
- Web applications that accept and process user-uploaded archive files
The vulnerability requires no authentication and can be exploited remotely over the network by delivering the malicious archive to the target system.
Detection Methods for CVE-2025-5914
Indicators of Compromise
- Unexpected crashes or segmentation faults in applications using libarchive when processing RAR files
- Memory corruption errors or heap-related crashes in system logs
- Unusual process behavior or spawning of child processes after archive extraction operations
- Core dumps indicating double-free or heap corruption in libarchive-related processes
Detection Strategies
- Monitor for abnormal process termination signals (SIGABRT, SIGSEGV) in applications that utilize libarchive
- Deploy memory safety tools such as AddressSanitizer (ASan) in development and testing environments to detect double-free conditions
- Implement file integrity monitoring on systems processing external archive files
- Analyze application logs for repeated failures when handling RAR archive files from external sources
Monitoring Recommendations
- Enable detailed logging for archive processing operations to track file sources and extraction activities
- Implement network-level monitoring to detect large volumes of RAR file downloads or email attachments
- Configure endpoint detection solutions to alert on exploitation indicators such as unexpected memory access patterns
- Establish baseline behavior for applications using libarchive and alert on deviations
How to Mitigate CVE-2025-5914
Immediate Actions Required
- Update libarchive to version v3.8.0 or later, which contains the security fix
- Apply vendor-specific patches from Red Hat for affected Enterprise Linux and OpenShift Container Platform deployments
- Temporarily restrict or isolate systems that process untrusted RAR archives until patches are applied
- Review and audit applications in your environment that depend on libarchive for archive processing
Patch Information
The vulnerability has been addressed in libarchive version v3.8.0. The fix is available through GitHub Pull Request #2598, and the patched release can be obtained from GitHub Release v3.8.0.
Red Hat has released multiple security advisories addressing this vulnerability across their product lines. Enterprise Linux users should apply the appropriate updates based on their version:
Workarounds
- Disable or restrict RAR archive processing in applications where it is not strictly required
- Implement input validation to reject suspicious or oversized RAR archive files before processing
- Deploy application sandboxing or containerization to limit the impact of potential exploitation
- Use network segmentation to isolate systems that must process untrusted archives from critical infrastructure
# Check installed libarchive version
pkg-config --modversion libarchive
# For RHEL/CentOS systems, update libarchive package
sudo yum update libarchive
# For Debian/Ubuntu systems
sudo apt update && sudo apt upgrade libarchive13
# Verify the update was applied
libarchive --version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
