Zero‑Day RCE in Telegram’s rlottie Library (CVE‑2026‑111105) Enables Remote Code Execution

Zero‑Day RCE in Telegram’s rlottie Library (CVE‑2026‑111105) Enables Remote Code Execution

What It Is – A numeric‑truncation flaw in Telegram’s rlottie animation library allows an attacker to write before the start of an allocated buffer, leading to remote code execution. User interaction (visiting a malicious page or opening a crafted file) is required to trigger the exploit.

Exploitability – CVSS 7.0 (High). The vulnerability is publicly disclosed as a 0‑day; no public exploit code is known, but the attack path is fully described.

Affected Products – Telegram client applications that embed the rlottie library (all platforms).

Why It Matters for Trust & Control Assurance

• Demonstrates the need for continuous vulnerability‑management controls that capture, assess, and remediate software flaws across the supply chain.
• Provides evidence that a robust control‑mapping process can surface high‑severity gaps before they are leveraged in the wild, supporting defensible audit trails.
• Highlights the importance of secure configuration and user‑interaction safeguards as part of a broader risk‑based assurance posture demanded by enterprise buyers.

Recommended Actions

1. Deploy Telegram’s server‑side validation update immediately and restrict user interaction with untrusted content.
2. Run internal scans to identify any rlottie instances in your environment and verify they are patched.
3. Update your vulnerability‑management playbook to include numeric‑truncation checks for third‑party libraries.

Source: Zero Day Initiative Advisory – ZDI‑26‑757