CVE-2022-26280 in Libarchive
Summary
by MITRE • 03/29/2022
Libarchive v3.6.0 was discovered to contain an out-of-bounds read via the component zipx_lzma_alone_init.
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Analysis
by VulDB Data Team • 11/04/2025
The vulnerability identified as CVE-2022-26280 resides within libarchive version 3.6.0, a widely used library for handling various archive formats including zip, tar, and others. This security flaw manifests as an out-of-bounds read condition that occurs during the processing of zipx archives, specifically when the zipx_lzma_alone_init component attempts to parse certain malformed archive structures. The issue represents a critical concern for systems that rely on libarchive for decompressing and extracting archive files, as it can lead to unpredictable behavior and potential system compromise.
The technical root cause of this vulnerability stems from inadequate input validation within the zipx_lzma_alone_init function which handles the initialization of lzma compression algorithms for zipx format archives. When processing malformed or specially crafted zipx files, the function fails to properly bounds-check array accesses or validate the structure of compressed data segments. This allows an attacker to craft malicious archive files that cause the library to read memory locations beyond the intended buffer boundaries, potentially exposing sensitive data or causing application crashes. The vulnerability aligns with CWE-129, which describes improper validation of array index values, and represents a classic example of insufficient bounds checking in memory management operations.
The operational impact of this vulnerability extends beyond simple application instability, as it can be exploited to achieve remote code execution or information disclosure depending on the system configuration and memory layout. Systems utilizing libarchive for processing untrusted archive files become vulnerable to attacks where adversaries can craft zipx archives designed to trigger the out-of-bounds read condition. This creates potential for denial of service attacks that can crash applications or systems, as well as more sophisticated exploitation techniques that might leverage the memory corruption to execute arbitrary code. The vulnerability particularly affects web applications, file processing services, and automated systems that handle user-uploaded archives without proper sanitization.
Mitigation strategies for CVE-2022-26280 should prioritize immediate patching of affected libarchive installations to version 3.6.1 or later where the vulnerability has been addressed through proper bounds checking and input validation. Organizations should implement robust input sanitization measures for all archive processing workflows, including the use of sandboxed environments and strict file format validation before decompression operations. Network-based defenses can include implementing content filtering solutions that scan archive files for known malicious patterns, while application-level protections should enforce strict memory access controls and utilize address space layout randomization techniques. The vulnerability demonstrates the importance of maintaining up-to-date security libraries and implementing comprehensive security testing practices including fuzzing and static code analysis to identify similar issues in other components of the software supply chain. Organizations should also consider implementing monitoring solutions that can detect anomalous behavior patterns indicative of exploitation attempts, as the out-of-bounds read condition may be used as a stepping stone for more advanced attacks within the ATT&CK framework's privilege escalation and persistence phases.