Vulnerability · Published Oct 15, 2026 · Assigned by zdi

CVE-2026-111105Telegram rlottie Numeric Truncation Remote Code Execution Vulnerability

High 7.0

In plain English

A high-severity security flaw in Telegram from Telegram. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).

Severity (CVSS 3.0)7.0High

Exploit odds (30 days)0.2%top 92.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Telegram rlottie Numeric Truncation Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Telegram. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the rlottie library. The issue results from the lack of proper validation of user-supplied data, which can result in a write before the start of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-30207.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Ubuntu:26.10	rlottie	no fix listed	UBUNTU-CVE-2026-111105

Affected products (as reported)

Vendor	Product	Versions
Telegram	Telegram	6.6.2

Weakness: CWE-197 · Vector: CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References

ZDI-26-757 x_research-advisory