CVE-2026-49510: Samsung rlottie Buffer Overflow Flaw

CVE-2026-49510 Overview

CVE-2026-49510 is an integer overflow vulnerability [CWE-190] in Samsung's open source rlottie library. The library renders Lottie animations parsed from JSON-based vector graphics. The flaw exists in rlottie versions prior to commit 21292665023e5074b38254432716866d00f1985f.

An attacker who supplies a crafted animation file can trigger an integer overflow during parsing or rendering. The condition requires local access and user interaction. Successful exploitation can cause high-impact availability loss and limited integrity impact in the affected process.

Critical Impact

A crafted Lottie animation file can trigger an integer overflow in rlottie, leading to process crashes and possible memory corruption in applications that embed the library.

Affected Products

• Samsung rlottie open source animation library
• All rlottie builds before commit 21292665023e5074b38254432716866d00f1985f
• Downstream applications and platforms that statically or dynamically link affected rlottie versions

Discovery Timeline

• 2026-06-04 - CVE-2026-49510 published to NVD
• 2026-06-04 - Last updated in NVD database

Technical Details for CVE-2026-49510

Vulnerability Analysis

The vulnerability is an integer overflow or wraparound condition [CWE-190] inside rlottie. rlottie is Samsung's C++ engine for rendering Adobe After Effects animations exported as Lottie JSON. The library performs arithmetic on attacker-controlled values drawn from animation metadata, such as frame counts, layer dimensions, path point counts, and gradient stops.

When one of these values is large enough, an arithmetic operation wraps past the maximum value of its integer type. The wrapped result is then used in downstream allocation or indexing logic. This yields an undersized buffer or an out-of-range offset that subsequent code does not validate.

The issue resolves to high availability impact and low integrity impact, but no direct confidentiality impact. Exploitation requires local attack vector and user interaction, which aligns with the typical workflow of opening a malicious animation file in a viewer or editor.

Root Cause

The root cause is missing validation of integer arithmetic on untrusted inputs parsed from Lottie JSON. Size calculations multiply or add attacker-controlled fields without checking for overflow before passing the result to allocation or loop bounds. The fix is delivered in upstream commit 21292665023e5074b38254432716866d00f1985f. See the Samsung rlottie pull request for the corrective changes.

Attack Vector

An attacker crafts a malicious Lottie JSON file with field values designed to overflow internal size calculations. The victim opens the file in an application that uses a vulnerable rlottie build. Parsing the file triggers the overflow, which leads to a denial of service through process termination and may corrupt adjacent memory in the rendering process.

No code or proof-of-concept exploit is published for this CVE at the time of writing. Refer to the upstream Samsung rlottie pull request 592 for the specific code paths that were hardened.

Detection Methods for CVE-2026-49510

Indicators of Compromise

• Unexpected crashes or abnormal termination of applications that load .json or .lottie animation files
• Presence of Lottie JSON files with extreme numeric values in fields such as ip, op, w, h, or layer point counts
• Application crash dumps referencing rlottie symbols, parser functions, or vector graphics rendering routines

Detection Strategies

• Inventory all software that bundles rlottie and identify versions built before commit 21292665023e5074b38254432716866d00f1985f
• Hunt endpoint telemetry for processes loading librlottie modules that subsequently crash or exit abnormally
• Inspect Lottie JSON content with a schema validator that bounds numeric ranges before files reach the parser

Monitoring Recommendations

• Monitor process crash events on endpoints that render user-supplied animations, including messaging, design, and media applications
• Log file ingestion events for .json and .lottie files originating from external sources such as email attachments or downloads
• Track software bill of materials (SBOM) data to flag new builds that still embed pre-patch rlottie commits

How to Mitigate CVE-2026-49510

Immediate Actions Required

• Update rlottie to a build that includes commit 21292665023e5074b38254432716866d00f1985f or later
• Rebuild and redeploy any downstream application that statically links rlottie
• Restrict ingestion of Lottie animation files from untrusted sources until patched builds are deployed

Patch Information

The upstream fix is merged in the Samsung rlottie repository. Apply the changes from the Samsung rlottie pull request 592 or pull a tagged release that contains commit 21292665023e5074b38254432716866d00f1985f. Downstream vendors that ship rlottie should rebuild their packages against the patched source.

Workarounds

• Block or quarantine inbound Lottie JSON files at email and web gateways until applications are updated
• Sandbox processes that render third-party animation content to contain crashes and limit memory corruption impact
• Disable Lottie animation features in applications where the feature is non-essential and configurable