CVE-2026-103227 in GPAC
Summary
by MITRE • 09/30/2026
A weakness has been identified in GPAC up to 26.07.0. Affected by this issue is the function gf_dash_resolve_url of the file src/media_tools/dash_client.c of the component DASH Client. This manipulation causes buffer overflow. The attack is possible to be carried out remotely. Upgrading to version abi-16.26 can resolve this issue. Patch name: 4c8e26f278ff63eec57968f7bc696f604bb0cffd. It is recommended to upgrade the affected component.
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Analysis
by VulDB Data Team • 09/30/2026
The vulnerability identified in GPAC versions up to 26.07.0 represents a critical security flaw within the DASH Client module, specifically located in the gf_dash_resolve_url function found in src/media_tools/dash_client.c. This weakness is classified as a buffer overflow, which occurs when the application writes more data to a fixed-length block of memory than it can hold. In this specific context, the issue arises during the processing and resolution of URLs within Dynamic Adaptive Streaming over HTTP (DASH) manifests or related network requests. The gf_dash_resolve_url function appears to fail in properly validating input lengths before copying them into internal buffers, allowing an attacker who controls the URL content to overwrite adjacent memory locations. This type of error is a classic example of CWE-120, Buffer Copy without Checking Size of Input, and often falls under the broader category of CWE-787, Out-of-bounds Write, depending on whether the overflow results in overwriting data or executing arbitrary code through stack smashing techniques.
The operational impact of this vulnerability is severe due to its remote exploitability. Because the flaw resides within a network-facing component responsible for handling streaming protocols, an attacker can trigger the buffer overflow by crafting malicious DASH manifests or redirecting requests to URLs containing oversized strings. Successful exploitation could lead to arbitrary code execution on the affected system, allowing full control over the application environment. This aligns with ATT&CK technique T1203, Exploitation for Client Execution, where adversaries leverage vulnerabilities in client-side software to gain a foothold within a network. The ability to execute remote attacks makes this particularly dangerous in environments where GPAC is used as part of media processing pipelines or streaming services that ingest external content from untrusted sources.
Mitigation strategies primarily focus on immediate patching and defensive configuration changes. The recommended course of action is to upgrade the affected component to version abi-16.26, which incorporates the fix identified by commit hash 4c8e26f278ff63eec57968f7bc696f604bb0cffd. This patch likely introduces bounds checking and input validation mechanisms within the gf_dash_resolve_url function to prevent excessive data from being written into fixed-size buffers. In addition to upgrading, organizations should implement network-level controls such as web application firewalls or deep packet inspection systems that can detect anomalous URL lengths or malformed DASH manifest structures before they reach the vulnerable GPAC instance. Furthermore, developers integrating GPAC should ensure that all input sources are sanitized and validated against expected length constraints prior to being passed to media processing functions, adhering to secure coding practices outlined in CWE-20, Improper Input Validation.