CVE-2026-25713

Executive Summary

CVE-2026-25713 is a heap buffer overflow vulnerability discovered in the ID3v2 parsing module of MediaArea MediaInfoLib, a widely used, open-source library for extracting technical metadata from multimedia files. Successful exploitation could allow an attacker to execute arbitrary code or cause a denial of service on applications that parse maliciously crafted media files, such as media players, video analyzers, or asset management systems. Given the library's integration into numerous third-party applications, the vulnerability has a high potential blast radius across the digital media ecosystem and currently remains unpatched.

Technical Analysis

The vulnerability resides in the ID3v2 metadata tag parsing logic of MediaInfoLib. ID3v2 tags are structured with a 10-byte header containing a magic identifier ("ID3"), a version byte, a flags byte, and a synchsafe integer representing the tag's total size. The parser subsequently processes a series of frames, each preceded by a 10-byte frame header that defines the frame ID and its size.

The heap buffer overflow is triggered during the allocation and subsequent copy operations when handling an oversized frame size declared in the ID3v2 header. The parser trusts the declared frame size field without sufficient validation against the actual allocated buffer length. When the declared frame size exceeds the bounds of the heap-allocated buffer, a subsequent memcpy operation writes beyond the allocated region, corrupting adjacent heap metadata and adjacent objects.

Specifically, the affected code path is in the frame content extraction function, which calculates a destination pointer based on the header's size field and copies frame data into it. An attacker controls both the frame size field and the accompanying data payload, providing precise control over the overflow's magnitude and content. This enables an attacker to overwrite adjacent heap structures, and with heap grooming techniques, redirect execution flow by corrupting function pointers or object vtables stored on the heap.

The attack surface is any API entry point that accepts an ID3v2-tagged media file. This includes the core static functions in MediaInfoLib (e.g., MediaInfoList::Open, MediaInfo::Open), command-line utilities (mediainfo), and all downstream applications that link against the library, rendering remote file parsing (e.g., via a web service or media player) as the most likely attack vector.

Exploitation Scenarios

The following is a concrete attack chain an adversary would execute to exploit CVE-2026-25713:

Step 1: Reconnaissance & Target Identification The attacker identifies a high-value target application that parses media files using MediaInfoLib, such as a video surveillance dashboard, a digital asset management (DAM) system, or a media server. The attacker fingerprints the target software version by sending benign media files and correlating response headers, error messages, or timing differences, confirming the presence of a vulnerable build of MediaInfoLib.

Step 2: Weaponization & Trigger The attacker crafts a malicious MP3 or MP4 file. The file embeds an ID3v2 tag where the header declares a valid, small total tag size (e.g., 100 bytes) to pass initial size checks, but the first frame within that tag declares a frame size larger than the remaining buffer space (e.g., 0xFFFF). The attacker populates the frame data with a heap-spraying pattern (repeating "A" bytes) followed by forged metadata that will be used to corrupt a heap object. The crafted file is thoroughly tested locally against a copy of the target application to ensure the overflow reliably overwrites a function pointer in the adjacent heap chunk.

Step 3: Payload Execution The attacker delivers the malicious file via a phishing email, a direct download link, or by uploading it to a public-facing web service that automatically parses submissions. When the target application calls MediaInfo::Open() on the file, the parser reads the malicious frame header, allocates a heap buffer sized to the legitimate total tag size, and then performs an out-of-bounds memcpy with the attacker-controlled frame data. The overflow overwrites a vtable pointer or a function pointer used by the application. When the application subsequently invokes that pointer, execution redirects to a ROP chain or shellcode sprayed in the heap, resulting in arbitrary code execution with the privileges of the target application.

Step 4: Post-Exploitation With a foothold established, the attacker executes a second-stage payload to establish persistence, loot credentials from the host or attached storage, or pivot deeper into the network. In a media server environment, the attacker may attempt to move laterally to connected database servers or backup infrastructure.

Impact Assessment

CVSS Score: 7.8 (High) — Based on common attack vectors, this score reflects high impact to confidentiality, integrity, and availability, with the assumption of local or user-interaction required access in the default scoring context. However, when the vulnerable library is used in a server-side parsing context, the effective risk may be higher due to remote exploitation potential without user interaction.

Business Impact: High. MediaInfoLib is a foundational component with a vast installed base, including VLC (via its dependencies), Audacity, and numerous commercial media analysis tools. A successful exploit results in full system compromise of any server or workstation processing a crafted file. For organizations that process user-submitted media (e.g., social platforms, media hosting services, healthcare imaging), this presents a severe and likely remote attack vector, enabling mass compromise of backend infrastructure.

Blast Radius: Any application linking against MediaInfoLib versions prior to a patch. This includes SaaS platforms, desktop media tools, and embedded appliances. The lack of a vendor patch (patch confidence 0/4) elevates every affected deployment to a zero-day risk status, requiring immediate proactive defenses.

Detection Guidance

Sigma Rule

title: Potential CVE-2026-25713 Exploitation via MediaInfoLib ID3v2 Parsing
id: 8f2d9b0e-37c4-4a91-bf3c-11c4e89a6f58
status: experimental
description: Detects suspicious crash patterns or malformed ID3v2 headers processed by applications linked against MediaInfoLib.
logsource:
  category: process_creation
  product: windows
detection:
  selection_crash:
    EventID: 1000  # Application Error
    Application Name|endswith:
      - 'mediainfo.exe'
      - 'vlc.exe'
    Faulting Module|contains: 'MediaInfo.dll'
  selection_log:
    EventID: 1001  # Windows Error Reporting
    Report Description|contains: 'MediaInfo'
  condition: selection_crash or selection_log
level: high
falsepositives:
  - Legitimate malformed media files causing crashes
tags:
  - attack.t1203
  - cve.2026.25713

YARA Rule

rule CVE_2026_25713_Malicious_ID3v2_Frame
{
    meta:
        author = "ValterIT SOC"
        description = "Detects ID3v2 headers with anomalous frame sizes indicative of CVE-2026-25713 heap overflow attempts."
        cve = "CVE-2026-25713"
        date = "2026-01-01"

    strings:
        // Look for ID3v2 magic and version 2.3/2.4
        $id3v2_magic = "ID3"
        // Synchsafe size format: 0x00 0x00 0x0X 0xXX
        $synchsafe1 = { 00 00 00 ?? }
        $synchsafe2 = { 00 00 ?? ?? }
        // Typical frame header IDs (e.g., TIT2, APIC, TXXX)
        $frame_id_tit2 = "TIT2"
        $frame_id_apic = "APIC"
        $frame_id_txxx = "TXXX"
        // Anomalously large size field (e.g., 0xFF FF FF FF)
        $large_size = { FF FF FF FF }

    condition:
        uint16(0) == 0x4944 and // "ID"
        $id3v2_magic at 0 and
        ($synchsafe1 at 6 or $synchsafe2 at 6) and
        any of ($frame_id_*) and
        $large_size and
        filesize > 20
}

Suricata IDS Rule

alert http any any -> any any (msg:"CVE-2026-25713 - MediaInfoLib ID3v2 Heap Overflow Attempt"; flow:established,to_server; content:"ID3"; http_client_body; depth:3; content:"FF FF FF FF"; http_client_body; distance:6; within:4; reference:cve,2026-25713; classtype:attempted-admin; sid:2026025713; rev:1;)

Elastic Detection

// Detect process crashes linked to MediaInfo.dll, indicating a likely exploitation attempt
sequence with maxspan=5m
  [ process where event.action == "start" and process.name in ("mediainfo.exe", "vlc.exe") ]
  [ file where event.action == "opened" and file.extension in ("mp3", "mp4", "m4a") ]
  [ process where event.action == "crash" and process.name in ("mediainfo.exe", "vlc.exe")
      and process.command_line contains "MediaInfo" ]

Splunk SPL Query

index=windows source="WinEventLog:Application"
| search EventCode=1000 OR EventCode=1002
| rex field=_raw "(?i)Application Name:\s+(?<app>[^\r\n]+)"
| rex field=_raw "(?i)Faulting Module:\s+(?<module>[^\r\n]+)"
| where match(app, "(?i)mediainfo|vlc") OR match(module, "(?i)mediainfo")
| table _time, host, app, module, Message
| sort _time desc
| eval alert_status = "Suspected CVE-2026-25713 Exploitation"

Wazuh OSSEC Rule

<group name="media_parsing,">
  <rule id="958225" level="12">
    <if_sid>5000000</if_sid>
    <match>MediaInfo</match>
    <description>CVE-2026-25713: MediaInfoLib ID3v2 parsing heap overflow - suspected attack/exploitation attempt</description>
    <group>cve-2026-25713,</group>
    <mitre>
      <id>T1203</id>
    </mitre>
  </rule>
</group>

Mitigation & Patch Guidance

Patch Confidence: 0/4 (UNPATCHED) — No upstream patch, vendor advisory, or fixed version is currently available. The following actions are required:

1) Immediate Mitigations:

• Ingress Filtering: If media files are uploaded to servers, implement strict file validation and sanitization at the proxy layer. Reject files containing ID3v2 tags if business logic allows.
• Isolation: Run applications that process untrusted media in sandboxed containers or VMs with minimal privileges and no persistent network access.
• Local User Restriction: For desktop applications, enforce a security policy that blocks opening media files from untrusted sources (email attachments, downloads) until a patch is available.
• Memory Integrity: Enable exploitation mitigations at the OS level, such as ASLR, DEP, and Control Flow Guard (CFG) on Windows, or hardened heap settings on Linux.

2) Patch/Upgrade Steps:

• Monitor the MediaArea GitHub repository (github.com/MediaArea/MediaInfoLib) and official security advisories daily for a patch.
• Subscribe to the vendor’s security release newsletter for immediate notification.
• When a patch is released, prioritize upgrading all systems linking against MediaInfoLib. For package-based distributions, apply the updated package as soon as it is published.
• For applications with hard-coded library copies, recompile the application against the patched library version as soon as it’s available.

3) Long-Term Hardening:

• Implement a Software Bill of Materials (SBOM) process to automatically alert on vulnerable dependencies.
• Integrate MediaInfoLib in a standalone, network-isolated microservice that performs metadata extraction, ensuring no other corporate data shares the processing environment.
• Establish a proactive monitoring rule set for heap corruption crashes across all production media-processing endpoints.

References

1. NVD Entry: CVE-2026-25713
2. Vendor Repository (monitor for patches): MediaArea/MediaInfoLib - GitHub
3. CISA Known Exploited Vulnerabilities Catalog: CISA KEV — CVE currently not listed.
4. OSV Database Entry (if applicable): OSV.dev search for CVE-2026-25713.
5. MITRE ATT&CK Technique T1203: Exploitation for Client Execution

Currently, there is no evidence of CVE-2026-25713 being exploited in the wild (EPSS percentile 10.9%), nor any disclosure of exploit code. However, as an unpatched vulnerability with a clear attack vector, it remains a high-priority target for both security researchers and malicious actors.