CVE-2026-71613 in GPAC
Summary
by MITRE • 09/09/2026
Buffer Overflow vulnerability in GPAC c2dee3aff638cd96f9617ac5b17dc2868cd90ef3 allows an attacker to execute arbitrary code via the j2kdec_process() function. Fixed in 9a253a07fd3f6b48022bba74302bf39388dda859.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified within the GPAC multimedia framework, specifically linked to commit c2dee3aff638cd96f9617ac5b17dc2868cd90ef3, represents a critical buffer overflow condition located in the j2kdec_process() function. This component is responsible for decoding JPEG 2000 image streams, a format widely used in digital cinema and high-resolution imaging applications. The root cause of this flaw lies in insufficient boundary checking during the processing of input data structures. When an attacker supplies a specially crafted or malformed JPEG 2000 file, the decoder fails to validate the length of specific fields against the allocated buffer size. This lack of validation allows for writing beyond the bounds of the intended memory region, leading to heap corruption and potential control flow hijacking.
From a technical perspective, this vulnerability aligns with CWE-120, which classifies buffer copies without checking size limits as a classic cause of arbitrary code execution vulnerabilities. The j2kdec_process() function handles various codestream elements such as tile parts and data segments. If the header information indicates a larger segment than what is actually present or if internal calculations result in an offset that exceeds allocated memory, the subsequent write operations will overwrite adjacent heap metadata or other critical variables. This corruption can be exploited to manipulate return addresses on the stack or function pointers within the heap structure, thereby granting the attacker arbitrary code execution capabilities under the context of the application running GPAC.
The operational impact of this vulnerability is severe due to the nature of multimedia processing software which often runs with elevated privileges or processes untrusted content from various sources including web browsers, media players, and document viewers that integrate such libraries. An successful exploitation could lead to complete system compromise, allowing an attacker to install malware, steal sensitive data, or establish a persistent foothold within the network. Furthermore, because JPEG 2000 is used in professional workflows involving digital cinema packages (DCPs), this vulnerability poses a significant risk to content providers and exhibitors who rely on GPAC for validation and playback of cinematic assets. The ability to execute arbitrary code means that maliciously crafted DCPs could serve as effective vectors for initial access against targeted infrastructure.
Mitigation strategies primarily involve updating the GPAC library to version 9a253a07fd3f6b48022bba74302bf39388dda859 or later, where this specific buffer overflow has been addressed through rigorous input validation and bounds checking enhancements. For organizations unable to immediately patch their systems, implementing strict file type filtering at the network perimeter can reduce exposure by blocking potentially malicious JPEG 2000 files before they reach vulnerable applications. Additionally, enabling memory protection mechanisms such as Address Space Layout Randomization (ASLR) and Data Execution Prevention (DEP) can mitigate the likelihood of successful code execution even if the buffer overflow is triggered. Security teams should also monitor for anomalous behavior in processes utilizing GPAC, particularly those involving high-volume image decoding operations, to detect potential exploitation attempts aligned with ATT&CK techniques related to initial access via spearphishing attachment or valid accounts exploiting software vulnerabilities.