CVE-2021-31320: Telegram

High severity, CVSS 7.1. EPSS: 1.2% chance of exploitation in the next 30 days.

Telegram Android <7.1.0 (2090), Telegram iOS <7.1, and Telegram macOS <7.1 are affected by a Heap Buffer Overflow in the VGradientCache::generateGradientColorTable function of their custom fork of the rlottie library. A remote attacker might be able to overwrite heap memory out-of-bounds on a victim device via a malicious animated sticker.

Affected products

• Telegram Telegram: before 7.1.0 (fixed in 7.1.0)

Published 2021-05-18. Last modified 2026-06-17.