CVE-2026-19389 in Red Hat
Summary
by MITRE • 08/10/2026
Multiple integer overflow and underflow vulnerabilities were found in the GStreamer gst-plugins-ugly ASF demuxer (asfdemux) when parsing header objects from crafted ASF, WMV, or WMA files. Insufficient validation of attacker-controlled length and size values can bypass bounds checks and cause out-of-bounds heap reads. This can result in application crash, denial of service, or limited information disclosure when untrusted media is processed.
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Analysis
by VulDB Data Team • 08/10/2026
The vulnerability resides within the GStreamer gst-plugins-ugly ASF demuxer component, specifically in the asfdemux module responsible for parsing Advanced Systems Format files including wmv and wma media containers. This represents a critical security flaw that affects multimedia processing applications relying on GStreamer for format handling. The integer overflow and underflow conditions occur during the parsing of header objects within these crafted media files, where attacker-controlled values are not adequately validated before being used in memory operations.
The technical exploitation involves manipulating length and size fields within ASF file headers to trigger arithmetic overflow or underflow conditions in the demuxer's parsing logic. When these unvalidated values are used to calculate buffer sizes or array indices, they can result in heap memory access violations that bypass normal bounds checking mechanisms. The vulnerability specifically targets heap-based memory operations where the malicious input causes calculations to wrap around to small values or negative numbers, leading to out-of-bounds reads from heap-allocated buffers.
From an operational perspective, this vulnerability creates multiple attack vectors for remote exploitation through media file manipulation. An attacker can craft malicious ASF, WMV, or WMA files that when processed by vulnerable applications will trigger the integer overflow conditions, resulting in application crashes or denial of service scenarios. The limited information disclosure aspect suggests that successful exploitation might allow attackers to read adjacent heap memory regions, potentially exposing sensitive data or application state information.
The vulnerability maps directly to CWE-190 which describes integer overflow and underflow conditions, and aligns with ATT&CK technique T1203 for Exploitation for Client Execution. Applications using GStreamer's asfdemux component for processing untrusted media content are at risk, particularly those in web browsers, media players, or content management systems that automatically parse multimedia files without proper input validation.
Mitigation strategies include immediate patching of the affected GStreamer components to implement proper bounds checking and input validation for all length and size fields in ASF file headers. Developers should employ defensive programming practices including explicit range checks before arithmetic operations, use of safe integer arithmetic libraries, and comprehensive testing with fuzzed media files to identify similar vulnerabilities. Additionally, implementing sandboxing mechanisms for media processing and restricting file format support to only trusted sources can provide additional layers of protection against exploitation attempts.
The vulnerability demonstrates the importance of rigorous input validation in multimedia processing components, as these systems often handle untrusted data from various sources without adequate sanitization. System administrators should monitor for updated versions of GStreamer packages and ensure all media processing applications are patched promptly to prevent exploitation by threat actors targeting multimedia parsing vulnerabilities.