# CVE-2021-31320: librlottie0-1: Telegram Android <7.1.0 (2090), Telegram iOS <7.1, and Telegram macOS <7.1 are affected by a Heap Buffer Ove...

CVE-2021-31320 is fixed in librlottie0-1 on 1 platform by librlottie0-1 0~git20200305.a717479+dfsg-1ubuntu0.1~esm1 (version 0~git20200305.a717479+dfsg-1ubuntu0.1~esm1), released May 18, 2021. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-31320
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0122
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 18, 2021

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | librlottie0-1 Ubuntu 20.04 LTS (focal) | 0~git20200305.a717479+dfsg-1ubuntu0.1~esm1 | [librlottie0-1 0~git20200305.a717479+dfsg-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-librlottie0-1-0-git20200305.a717479-dfsg-1ubuntu0.1-esm1.md) | May 18, 2021 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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