CVE-2026-1465: anyRTC-RTMP Buffer Overflow Vulnerability

CVE-2026-1465 Overview

CVE-2026-1465 is an Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability (CWE-119) affecting the anyrtcIO-Community anyRTC-RTMP-OpenSource project. The vulnerability exists within the third-party faad2-2.7/libfaad modules, specifically in the bits.c and syntax.c program files. This memory buffer vulnerability allows attackers to potentially execute arbitrary code or cause denial of service conditions through improper memory operations.

Critical Impact

Successful exploitation could allow an attacker to execute arbitrary code with the privileges of the application, corrupt memory, or cause the application to crash, affecting all systems running vulnerable versions of anyRTC-RTMP-OpenSource prior to version 1.0.

Affected Products

• anyRTC-RTMP-OpenSource versions before 1.0
• Systems utilizing the bundled third-party faad2-2.7/libfaad library
• Applications integrating anyRTC-RTMP-OpenSource for RTMP streaming functionality

Discovery Timeline

• 2026-01-27 - CVE-2026-1465 published to NVD
• 2026-01-27 - Last updated in NVD database

Technical Details for CVE-2026-1465

Vulnerability Analysis

This vulnerability falls under the category of Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119). The flaw exists in the FAAD2 audio decoder library that is bundled as a third-party component within the anyRTC-RTMP-OpenSource project. The affected files, bits.c and syntax.c, handle bitstream operations and audio syntax parsing respectively.

When processing specially crafted audio data, the vulnerable code fails to properly validate memory boundaries before performing read or write operations. This can lead to out-of-bounds memory access, potentially allowing an attacker to corrupt adjacent memory regions, leak sensitive information, or achieve code execution.

The attack requires local access and user interaction, indicating that exploitation likely involves tricking a user into processing a malicious media file through an application using the vulnerable library.

Root Cause

The root cause stems from insufficient boundary checking in the bits.c and syntax.c files within the FAAD2 library (version 2.7). During audio decoding operations, the code performs memory operations without adequately verifying that the target memory addresses fall within allocated buffer boundaries. This allows specially crafted input to trigger memory access outside the intended buffer limits.

Attack Vector

The attack vector is local and requires user interaction. An attacker would need to craft a malicious audio file or media stream that, when processed by an application using the vulnerable anyRTC-RTMP-OpenSource library, triggers the memory buffer vulnerability. The exploitation scenario typically involves:

1. Creating a specially crafted audio file with malformed syntax data
2. Delivering the malicious file to the target user
3. Waiting for the user to open or process the file using a vulnerable application
4. The bits.c and syntax.c modules process the malformed data, triggering the buffer operation vulnerability

The vulnerability does not currently have known public exploits, though the technical details are available through the GitHub Pull Request Discussion.

Detection Methods for CVE-2026-1465

Indicators of Compromise

• Unexpected crashes or memory corruption errors in applications using anyRTC-RTMP-OpenSource
• Abnormal memory consumption patterns during audio stream processing
• Application crash dumps referencing bits.c or syntax.c in the faad2 library
• Presence of suspicious or malformed audio files targeting FAAD2 decoder vulnerabilities

Detection Strategies

• Monitor for applications crashing with stack traces involving the faad2 library components
• Implement file integrity monitoring for the libfaad library files
• Deploy memory protection mechanisms such as ASLR, DEP, and stack canaries
• Use SentinelOne's behavioral AI engine to detect anomalous memory access patterns

Monitoring Recommendations

• Enable verbose logging for applications utilizing anyRTC-RTMP-OpenSource
• Monitor system logs for segmentation faults or memory access violations
• Track file access patterns for suspicious audio file processing activities
• Implement network monitoring to detect potential delivery of malicious media files

How to Mitigate CVE-2026-1465

Immediate Actions Required

• Upgrade anyRTC-RTMP-OpenSource to version 1.0 or later
• Review the GitHub Pull Request Discussion for detailed patch information
• Audit systems for the presence of vulnerable anyRTC-RTMP-OpenSource versions
• Implement application sandboxing to limit the impact of potential exploitation

Patch Information

The vulnerability affects anyRTC-RTMP-OpenSource versions prior to 1.0. Users should upgrade to version 1.0 or later to remediate this vulnerability. The fix addresses the improper memory boundary checking in the bundled faad2-2.7/libfaad modules. Technical details and patch discussion are available in GitHub Pull Request #166.

Workarounds

• Restrict processing of untrusted audio files through applications using the vulnerable library
• Implement input validation and sanitization for media files before processing
• Run vulnerable applications in isolated environments with limited privileges
• Consider replacing the bundled FAAD2 library with an updated version that includes security fixes

If immediate patching is not possible, organizations should implement defense-in-depth strategies including:

# Example: Restricting file permissions for the vulnerable library
chmod 750 /path/to/anyRTC-RTMP-OpenSource/third_party/faad2-2.7/libfaad/
# Enable memory protections at the OS level where applicable
echo 2 > /proc/sys/kernel/randomize_va_space