PT-2026-3165 · Telegram · Telegram Desktop

Aryan Chehreghani · Published 2026-01-15 · Updated 2026-01-30 · CVE-2021-47793

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Telegram Desktop version 2.9.2

Description Telegram Desktop version 2.9.2 contains a denial of service issue that allows attackers to crash the application. This is achieved by sending an oversized message payload, specifically a 9 million byte buffer, which is pasted into the messaging interface. This action triggers an application crash.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

DoS

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

CVE-2021-47793

Affected Products

Telegram Desktop

References · 9

• 🔥 https://exploit-db.com/exploits/50247 · Exploit
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-47793 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-47793 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-47793 · Security Note
• https://osv.dev/vulnerability/CVE-2021-47793 · Vendor Advisory
• https://telegram.org · Note
• https://vulncheck.com/advisories/telegram-desktop-denial-of-service-poc · Note
• https://t.me/cveNotify/150345 · Telegram Post
• https://twitter.com/CVEnew/status/2012126497033584893 · Twitter Post