Numeric Truncation Vulnerability in Telegram's rlottie Library

CVE-2026-111105

What is CVE-2026-111105?

CVE-2026-111105 is a numeric truncation vulnerability identified in the rlottie library utilized by Telegram, a widely-used messaging platform. This vulnerability arises due to improper validation of user-supplied data, permitting an attacker to manipulate the handling of data in memory. Specifically, it allows for a scenario where code can be executed before the start of an allocated buffer, leading to potential remote code execution. For organizations using Telegram, this vulnerability poses a significant risk, as it could enable malicious actors to run arbitrary code within the context of the Telegram application on a user's system. The requirement for user interaction—such as visiting a malicious site or opening a compromised file—does not diminish the threat, as many users may inadvertently perform such actions.

Potential impact of CVE-2026-111105

1. Remote Code Execution: Attackers could exploit this vulnerability to execute arbitrary code on affected installations of Telegram, which could lead to full compromise of the user’s device.

2. Data Integrity and Privacy Risks: Successful exploitation may allow attackers to access sensitive data transmitted through Telegram or stored on the device, thus jeopardizing user confidentiality and data integrity.

3. Widespread Distribution: Given Telegram's large user base, the exploitation of this vulnerability could have cascading effects, leading to further dissemination of malware and affecting a vast number of users and systems across various sectors.

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