Description

Stack-based buffer overflow vulnerability in Samsung Opensource rLottie allows attackers to overflow buffers, leading to memory corruption when rendering crafted vector animations. This issue affects rLottie: 480a2ad0c5d2e45458c545b8213279e9e8b71e39.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "4.4",
  "pubDate": "2026-09-15T09:16:45.743Z",
  "pubdate": "2026-09-15T09:16:45.743Z",
  "executiveSummary": "A critical stack-based buffer overflow vulnerability exists within the Samsung Opensource rLottie library, specifically impacting commit version 480a2ad0c5d2e45458c545b8213279e9e8b71e39.\nThe vulnerability stems from improper bounds checking during the processing of vector animation files. By supplying a maliciously crafted animation file, an attacker can trigger a memory corruption event.\nSuccessful exploitation of this vulnerability allows for arbitrary memory overwriting, which may lead to application crashes (Denial of Service) or potential arbitrary code execution, depending on the attacker's ability to control the instruction pointer.\nThis issue represents a significant risk to any application integrating rLottie for rendering vector animations, as the attack vector is facilitated by the standard file-parsing pipeline of the library.\nNo specific authentication or escalated privileges are required for an attacker to initiate the exploitation process; however, the attacker must successfully convince a user or automated system to process a specially crafted Lottie animation file.",
  "technicalDetails": "The vulnerability is a classic stack-based buffer overflow occurring within the rLottie rendering engine's internal data processing routines. It occurs when the library handles malformed or maliciously structured vector animation data. The root cause is identified as the failure to validate the length of input data before copying it into a fixed-size buffer allocated on the stack.\nDuring the parsing and rendering stage, the library utilizes internal buffers to store segments of the vector animation definition. If the crafted animation file contains metadata or path data that exceeds the pre-allocated buffer size, the library performs a memory copy operation that does not respect boundary constraints. This causes the overflow to overwrite adjacent stack memory.\nThe exploitation flow initiates when the target application attempts to render a malicious vector animation file. Upon parsing, the vulnerable function reads the input payload and fails to verify that the size of the source data conforms to the destination buffer capacity. As the data is written to the stack, it overwrites critical data structures, including saved base pointers and the return address. If an attacker can precisely control the content of the overflow, they can redirect the execution flow of the application to arbitrary memory addresses, potentially executing shellcode or utilizing return-oriented programming (ROP) chains to bypass security protections such as DEP (Data Execution Prevention) or ASLR (Address Space Layout Randomization).\nThe vulnerable component is the rLottie animation parsing and rendering logic, which lacks sufficient sanitization routines when handling complex vector definitions. Because this logic is executed in the context of the rendering process, any memory corruption directly impacts the stability and security of the host application. The specific commit identified (480a2ad0c5d2e45458c545b8213279e9e8b71e39) represents the state of the codebase containing the flawed logic. The impact is broad, as the parser is typically invoked automatically whenever a file is loaded for display, meaning the attack requires minimal user interaction beyond the initial delivery of the vector file. Post-exploitation, the attacker may achieve remote code execution, enabling them to compromise the confidentiality, integrity, and availability of the local system environment where the rendering process resides."
}