CVE-2026-1108: cijliu librtsp Buffer Overflow Vulnerability

CVE-2026-1108 Overview

A buffer overflow vulnerability has been identified in cijliu librtsp, an RTSP (Real Time Streaming Protocol) library. The vulnerability exists in the rtsp_rely_dumps function and can be exploited through local access to cause memory corruption. This flaw allows an attacker with local access and low privileges to manipulate input data, leading to potential confidentiality, integrity, and availability impacts on the affected system.

Critical Impact

Local attackers can exploit this buffer overflow vulnerability in the rtsp_rely_dumps function to cause memory corruption, potentially leading to information disclosure, data modification, or service disruption.

Affected Products

• cijliu librtsp (commit 2ec1a81ad65280568a0c7c16420d7c10fde13b04 and prior)
• All versions using rolling release model without specific version identifiers

Discovery Timeline

• January 18, 2026 - CVE-2026-1108 published to NVD
• January 18, 2026 - Last updated in NVD database

Technical Details for CVE-2026-1108

Vulnerability Analysis

This buffer overflow vulnerability (CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer) affects the rtsp_rely_dumps function within the cijliu librtsp library. The vulnerability occurs when the function fails to properly validate the boundaries of memory operations, allowing specially crafted input to write beyond allocated buffer limits.

The librtsp library handles RTSP protocol operations commonly used in streaming media applications. The rtsp_rely_dumps function appears to be responsible for processing and dumping RTSP relay data, and insufficient bounds checking in this function creates an exploitable condition.

Since librtsp uses a rolling release model without versioned releases, all deployments using commits up to and including 2ec1a81ad65280568a0c7c16420d7c10fde13b04 are potentially affected. The vendor was contacted regarding this disclosure but did not respond.

Root Cause

The root cause of this vulnerability is improper restriction of operations within the bounds of a memory buffer (CWE-119) in the rtsp_rely_dumps function. The function does not adequately validate input length or ensure that write operations remain within allocated memory boundaries. When processing RTSP relay data, the function can be manipulated to write beyond the intended buffer, causing memory corruption.

Attack Vector

The attack requires local access to the vulnerable system. An attacker with low-level privileges can craft malicious input that triggers the buffer overflow condition when processed by the rtsp_rely_dumps function. The vulnerability can be approached locally through:

The exploitation mechanism involves passing specially crafted data to the rtsp_rely_dumps function that exceeds expected buffer boundaries. When the function processes this malicious input without proper bounds checking, it writes beyond allocated memory regions. For detailed technical analysis of the vulnerability and proof-of-concept information, refer to the GitHub PoC Repository.

Detection Methods for CVE-2026-1108

Indicators of Compromise

• Unexpected crashes or segmentation faults in applications using librtsp
• Abnormal memory consumption patterns in processes utilizing the RTSP library
• Core dumps indicating buffer overflow or memory corruption in rtsp_rely_dumps

Detection Strategies

• Monitor application logs for segmentation faults or memory access violations related to librtsp
• Implement runtime memory protection tools (AddressSanitizer, Valgrind) in development and testing environments
• Deploy endpoint detection solutions capable of identifying buffer overflow exploitation attempts

Monitoring Recommendations

• Enable verbose logging for applications utilizing librtsp to capture function call traces
• Configure crash reporting systems to alert on unexpected terminations in RTSP-related processes
• Implement memory integrity monitoring on systems running librtsp-dependent applications

How to Mitigate CVE-2026-1108

Immediate Actions Required

• Audit systems for deployments of cijliu librtsp and identify affected applications
• Restrict local access to systems running vulnerable librtsp instances to authorized users only
• Consider isolating affected applications in sandboxed environments until a fix is available
• Monitor the librtsp repository for security updates addressing this vulnerability

Patch Information

No official patch is currently available from the vendor. The librtsp project uses a rolling release model without versioned releases, and the vendor has not responded to disclosure attempts. Organizations should monitor the VulDB entry and the upstream repository for updates.

Workarounds

• Restrict local access to systems running applications that use librtsp to minimize attack surface
• Implement application-level input validation before data reaches the rtsp_rely_dumps function
• Deploy memory protection mechanisms such as ASLR and stack canaries to complicate exploitation
• Consider replacing librtsp with an alternative RTSP library that is actively maintained with security patches