CVE-2026-47320 Overview
CVE-2026-47320 affects Samsung's open source rlottie library, a platform-independent library for rendering vector-based Lottie animations. The vulnerability combines two flaws: access of an uninitialized pointer and uncontrolled recursion [CWE-674]. Attackers can trigger these defects through crafted serialized animation data, manipulating pointers and supplying oversized payloads.
Exploitation requires local access and user interaction, such as opening a malicious animation file. Successful exploitation can corrupt pointer state and exhaust process resources through unbounded recursion.
The issue affects rlottie versions before commit eae37633fda13ac05b25c6c95aacea4bc33c80a3.
Critical Impact
Local attackers can crash applications or manipulate process memory by delivering crafted Lottie animation payloads that trigger uninitialized pointer access and unbounded recursive parsing.
Affected Products
- Samsung rlottie library before commit eae37633fda13ac05b25c6c95aacea4bc33c80a3
- Applications and platforms that embed vulnerable rlottie builds for Lottie animation rendering
- Downstream consumers integrating rlottie through statically or dynamically linked builds
Discovery Timeline
- 2026-06-04 - CVE-2026-47320 published to NVD
- 2026-06-04 - Last updated in NVD database
Technical Details for CVE-2026-47320
Vulnerability Analysis
The vulnerability resides in rlottie's deserialization of Lottie animation data. Two distinct defects coexist within the same code path. First, the parser accesses a pointer before initialization, returning unpredictable memory contents to subsequent logic. Second, the parser recursively descends into nested animation structures without enforcing a depth limit.
An attacker who supplies an oversized serialized payload can drive the parser into deep recursion, exhausting stack space and terminating the host process. The uninitialized pointer access creates a secondary corruption path where attacker-controlled values may influence dereference operations downstream.
The upstream fix is tracked in the Samsung rlottie GitHub Pull Request, which introduces bounds and initialization handling.
Root Cause
The root cause is missing validation during deserialization. The parser does not initialize a pointer field before use and does not cap recursive descent on nested animation nodes. These omissions align with [CWE-674] Uncontrolled Recursion semantics and undefined-behavior risks from uninitialized memory.
Attack Vector
The attack vector is local and requires user interaction. An attacker delivers a crafted Lottie animation file to a victim application that embeds rlottie. When the application parses the malicious payload, the recursive descent exhausts the stack and the uninitialized pointer is dereferenced, producing a denial-of-service condition and potential integrity impact.
No verified proof-of-concept code is published. See the upstream pull request for the technical fix details.
Detection Methods for CVE-2026-47320
Indicators of Compromise
- Repeated crashes or abnormal terminations in applications that render Lottie animations, particularly those linking rlottie
- Lottie or JSON animation files with abnormally deep nesting or unusually large serialized structures
- Stack overflow signals or segmentation faults in process telemetry tied to rlottie parsing routines
Detection Strategies
- Inventory all applications and software bundles linking rlottie and compare their commit or release version against eae37633fda13ac05b25c6c95aacea4bc33c80a3
- Inspect inbound Lottie JSON files for excessive nesting depth, oversized arrays, and malformed pointer references before passing them to the renderer
- Enable crash reporting and core-dump collection on systems running animation viewers or applications embedding rlottie
Monitoring Recommendations
- Monitor endpoint telemetry for repeated process crashes correlated with animation file opens
- Track file delivery channels (email, messaging, downloads) for .json or .lottie files with anomalous size
- Audit software bills of materials (SBOMs) for the vulnerable rlottie commit range
How to Mitigate CVE-2026-47320
Immediate Actions Required
- Update rlottie to a build that includes commit eae37633fda13ac05b25c6c95aacea4bc33c80a3 or later
- Rebuild and redeploy any downstream applications that statically link the vulnerable library
- Restrict acceptance of untrusted Lottie animation files until patched builds are deployed
Patch Information
The upstream fix is merged in Samsung rlottie Pull Request #593. Consumers must rebuild against the fixed commit. No vendor-supplied binary advisory is referenced in the NVD record.
Workarounds
- Block or sandbox Lottie animation rendering in untrusted contexts until patched
- Apply input validation at the application layer to reject Lottie files exceeding reasonable size and depth thresholds
- Disable automatic rendering of animation attachments in messaging and document viewers where feasible
# Verify rlottie commit in a local build
cd rlottie
git log --oneline | grep eae37633fda13ac05b25c6c95aacea4bc33c80a3
# Update to fixed revision
git fetch origin
git checkout eae37633fda13ac05b25c6c95aacea4bc33c80a3
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
