CVE-2026-15551: Samsung rlottie Buffer Overflow Flaw

CVE-2026-15551 Overview

CVE-2026-15551 is an integer overflow vulnerability in Samsung Open Source rlottie, a library used to render Lottie animations across mobile, desktop, and embedded platforms. The flaw is classified under [CWE-190: Integer Overflow or Wraparound] and can lead to buffer overflow conditions during animation parsing. Exploitation requires local access, low privileges, and user interaction, which limits mass exploitation potential. However, applications that accept untrusted Lottie animation files inherit the risk. A pull request in the upstream Samsung/rlottie repository addresses the underlying arithmetic issue.

Critical Impact
An attacker who convinces a local user to open a crafted Lottie animation can trigger memory corruption and cause the host application to crash or behave unpredictably.

Affected Products

Samsung Open Source rlottie library
Applications embedding vulnerable rlottie builds for Lottie animation rendering
Downstream projects that statically link or bundle unpatched rlottie sources

Discovery Timeline

2026-07-13 - CVE-2026-15551 published to NVD
2026-07-13 - Last updated in NVD database

Technical Details for CVE-2026-15551

Vulnerability Analysis

The vulnerability resides in rlottie, Samsung's open source renderer for Lottie JSON animations. During parsing or geometry computation, an arithmetic operation on attacker-influenced values wraps around the fixed-width integer range. The wrapped result is then used to size a downstream buffer allocation or index calculation. Because the sanity check runs against the truncated value, subsequent memory writes exceed the intended bounds. The result is a heap or stack buffer overflow inside the process that loaded the animation. Impact ranges from application crashes to potential logic corruption, depending on how the overflowed buffer is used. The attack surface is local, since the malicious animation file must be opened by an authenticated user on the affected host. Exploitation complexity is elevated because the attacker must control the specific fields that feed the vulnerable arithmetic and trigger the correct rendering path.

Root Cause

The root cause is unchecked integer arithmetic on values read from an untrusted Lottie asset. Multiplication or addition operations exceed the maximum representable value for the underlying integer type and silently wrap. The upstream fix, submitted as Samsung/rlottie pull request #595, tightens the bounds validation before the arithmetic result is used.

Attack Vector

An attacker crafts a malicious Lottie JSON animation with oversized numeric fields that trigger the integer wraparound. The victim, operating with low privileges, opens the file in an application backed by rlottie. Rendering the animation invokes the vulnerable code path, corrupting memory inside the process. No network access is required, and the attacker must rely on social engineering to deliver the file. See the upstream patch discussion for the specific code path.

Detection Methods for CVE-2026-15551

Indicators of Compromise

Repeated crashes or abnormal terminations of applications that render Lottie animations shortly after opening third-party asset files.
Presence of Lottie JSON files with unusually large numeric fields for dimensions, keyframes, or shape data on user endpoints.
Process memory faults referencing rlottie symbols in crash telemetry or Windows Error Reporting logs.

Detection Strategies

Inventory endpoints and mobile builds that ship rlottie and compare linked versions against the fixed upstream commit.
Hunt for Lottie animation files delivered through email, chat, or web downloads that originate from untrusted sources.
Correlate application crash events with recent file open activity for .json or .lottie assets to surface likely exploitation attempts.

Monitoring Recommendations

Enable exploit protection and crash dump collection on workstations that process user-supplied animation files.
Forward application crash telemetry and file execution events to a centralized analytics platform for retention and triage.
Track software bill of materials (SBOM) entries for rlottie to receive alerts when new upstream advisories are published.

How to Mitigate CVE-2026-15551

Immediate Actions Required

Identify all internal and third-party applications that embed rlottie and record the specific commit or release in use.
Rebuild affected applications against a rlottie version that includes the fix from pull request #595.
Restrict opening of Lottie animation files sourced from untrusted email attachments, chat platforms, or file shares until patches are deployed.

Patch Information

The upstream remediation is tracked in Samsung/rlottie pull request #595, which corrects the integer arithmetic that triggers the wraparound. Downstream vendors must integrate the fixed commit and publish updated builds. Applications that statically link rlottie require a full rebuild and redeployment. Verify the presence of the patch by inspecting the corresponding source files against the merged pull request.

Workarounds

Block or quarantine Lottie animation files from untrusted senders at the email gateway and secure web proxy.
Disable Lottie preview or auto-play features in applications that expose them until a patched build is available.
Run applications that render animations under least-privilege user accounts to constrain the impact of memory corruption.

bash

# Verify the rlottie source tree includes the upstream fix
git -C ./rlottie log --oneline | grep -i "pull/595\|integer overflow"

# Rebuild the library after applying the patched commit
cmake -S ./rlottie -B ./rlottie/build -DCMAKE_BUILD_TYPE=Release
cmake --build ./rlottie/build --target rlottie