Crush Bug Telegram (2025)

The "crush bug" (often misspelled "crash bug") refers to specific exploits or system errors that cause the Telegram application to freeze or shut down unexpectedly. These usually involve malicious text strings, media files, or links that overwhelm the app's processing capabilities. Common Types of Telegram "Crush" Bugs Malicious Links:

A known exploit involved sending specific external links that, when clicked or even previewed, forced the app to terminate. Media Overload:

Pasting multiple images with text descriptions or viewing large volumes of stickers/GIFs for 15–20 seconds has historically caused iOS and Desktop versions to crash. Large Text Spam:

Copying large images from browsers can sometimes paste massive volumes of raw text instead, causing the app to hang or crash while attempting to process the data. Interface Glitches:

Random crashes have been reported when using specific UI elements, such as tapping the search button on older iOS versions or interacting with scheduled message buttons that were canceled on another device. How to Resolve App Crashes

If your Telegram app is repeatedly crashing, follow these standard troubleshooting steps:

Images are being pasted as a huge text · Issue #26188 - GitHub

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The "crush bug" in Telegram typically refers to a variety of software vulnerabilities or "text bombs" that cause the application—and sometimes the entire device—to freeze, lag, or crash crush bug telegram

. These bugs often exploit how the app processes specific character strings, media files, or interface actions. Significant Telegram Crash Bugs (2024–2026)

Recent reports highlight high-risk vulnerabilities and functional bugs that lead to application failure: "EvilVideo" Vulnerability (CVE-2024-7014) : Discovered in

, this zero-day exploit allowed attackers to send malicious files disguised as videos on Telegram for Android. While it primarily aimed to install malware, it could lead to crashes if the system failed to handle the payload. A successor, EvilLoader , emerged in March 2025 , disguising files as videos to execute malicious code. Animated Sticker Zero-Click (2026) March 2026

, researchers identified a critical vulnerability where simply receiving an animated sticker could trigger remote code execution and potential device compromise on Android and Linux. Unicode "Text Bombs"

: Like other messaging apps, Telegram has historically been susceptible to specific character strings (such as certain Telugu or Sindhi characters) that overload the rendering engine, causing immediate crashes when the message is viewed or pasted. Common Functional "Crush" Issues

Many users report crashes triggered by specific app interactions rather than malicious attacks: Paste Crash

: A recurring issue where pasting formatted text from apps like Apple Notes or ChatGPT causes Telegram to exit immediately. UI Interaction Bugs Right-Click/Long-Press

: Clicking on certain messages in private groups or right-clicking on text inputs has been known to trigger segmentation faults. Emoji Hovering

: In some desktop versions (e.g., v6.7), simply hovering over an emoji caused the app to close due to rendering regressions. Specific Characters

: Typing specific letters (e.g., a capital 'O' in older versions) or accent characters can sometimes trigger a crash after the app has been open for a period. The "crush bug" (often misspelled "crash bug") refers

Telegram crashes when typing a capital letter O into any chat. #4259

This write-up describes a hypothetical or recently discovered "crush bug" (a type of denial-of-service or application-hang bug) affecting Telegram clients. This is intended for educational purposes, bug bounty reporting, or security research documentation.

Bug Title: Application Crash via Malformed Media Metadata / Character Sequence

Target: Telegram Desktop (Windows/macOS/Linux) and Telegram Mobile (Android/iOS).Vulnerability Type: Client-Side Denial of Service (DoS).Severity: Medium (Local/Remote Hang). 1. Executive Summary

A vulnerability was identified where sending a specifically crafted string of Unicode characters (or a malformed .tgs animated sticker file) causes the Telegram client to enter an infinite loop or experience a buffer overflow, resulting in an immediate application crash. The "crush" occurs as soon as the message is rendered in the chat view, even without user interaction. 2. Technical Analysis

The bug stems from how the Telegram UI engine parses specific Right-to-Left (RTL) override characters combined with complex emoji sequences.

Root Cause: The text-rendering engine fails to calculate the bounding box for a sequence of 10,000+ invisible zero-width joiners.

Memory Impact: CPU usage spikes to 100% on a single core as the layout engine attempts to paginate the message, eventually leading to a SIGSEGV (segmentation fault) or an "Application Not Responding" (ANR) state on mobile devices. 3. Proof of Concept (PoC)

To reproduce the crash, an attacker sends the following payload:

The Payload: [Buffer_of_5000_ZeroWidth_Chars] + [RTL_Override] + [Complex_Emoji_Sequence] Are you referring to a bug (software glitch)

Delivery: The payload is sent to a group or via Direct Message.

Trigger: The moment the victim scrolls to the message or receives a notification containing the preview text, the client freezes. 4. Impact

Group Disruption: An attacker can effectively "lock" a group chat for all members until the malicious message is deleted via the API or a different platform (e.g., Web K/Z which might be immune).

Persistence: If the message is the latest in a chat, the app may crash immediately upon startup during the initial synchronization of the message list. 5. Remediation & Mitigation

For Developers: Implement strict length limits on invisible character sequences and sanitize metadata before passing it to the layout engine. Use "lazy loading" for complex text blocks to prevent main-thread blocking.

For Users: If caught in a crash loop, log in via Telegram Web and delete the offending message. Disable "Message Previews" in notification settings to prevent background crashes. Desktop) or format it as an official GitHub Issue report?

How Does a Crush Bug Work on Telegram?

Telegram is built on the MTProto protocol, with separate clients for Android, iOS, Desktop (Windows/macOS/Linux), and Web. Each client has its own rendering engine for messages. A crush bug often exploits differences between these clients.

Here are the most common types of crush bugs found in Telegram:

✅ Turn Off Link Previews (Temporarily)

On Telegram Desktop: Settings > Advanced > Disable link preview generation. This stops the app from fetching dangerous previews.

5. Database Corruption via Sync

Some advanced crush bugs don’t crash the app once—they corrupt the local message database. Every time you reopen Telegram and it tries to sync that specific message, the app crashes again in an endless loop.

Real-world example (2023-2024): A known crush bug circulated in crypto trading groups. The message contained a single Arabic character followed by 2,000 invisible joining characters. Any Telegram user on Android v9.4.2 or below would see their app freeze and close immediately upon opening the chat.

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