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Vulnerability · Published May 3, 2026 · Assigned by VulDB

CVE-2026-7701Telegram Desktop Bot API url_auth_box.cpp RequestButton null pointer dereference

Medium 4.3

In plain English

A medium-severity null pointer dereference in Desktop from Telegram. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.4%top 66.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

A security vulnerability has been detected in Telegram Desktop up to 6.7.5. This vulnerability affects the function RequestButton of the file Telegram/SourceFiles/boxes/url_auth_box.cpp of the component Bot API. The manipulation of the argument login_url leads to null pointer dereference. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used. There is ongoing doubt regarding the real existence of this vulnerability. Upgrading to version 6.7.6 is able to resolve this issue. Upgrading the affected component is recommended. The vendor provides this rationale for the dispute: "[T]he described scenario does not lead to any security issue or vulnerability, and only causes a one-time crash. In the outlined scenario, the targeted user must perform an active action, which doesn't produce any consequences after the app is relaunched."

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12telegram-desktopno fix listedDEBIAN-CVE-2026-7701
Debian:14telegram-desktopno fix listedDEBIAN-CVE-2026-7701
Ubuntu:22.04:LTStelegram-desktopno fix listedUBUNTU-CVE-2026-7701

Affected products (as reported)

VendorProductVersions
Telegram Desktop 6.7.06.7.16.7.26.7.36.7.46.7.5

Weakness: CWE-476, CWE-404 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C

References