CVE-2026-7701
MediumCVSS 4.3Exploitation Probability (EPSS)
Low risk33th percentile - higher than 33% of all known CVEs
Summary
In Telegram Desktop up to 6.7.5, the RequestButton function in url_auth_box.cpp of the Bot API component, when manipulating the login_url argument, leads to a null pointer dereference. The attack can be initiated remotely and the exploit has been publicly disclosed. There is ongoing doubt about the real existence of this vulnerability, and the vendor states it only causes a one-time crash without security consequences.
Risk Assessment
A potential attacker could remotely crash the application on the victim's device, causing temporary unavailability. The vendor disputes a real security threat, stating it requires active user action and has no lasting effects.
Recommendation
Upgrade Telegram Desktop to version 6.7.6, which resolves the issue. Exercise caution when interacting with unknown login links.
Other vulnerabilities in Telegram Desktop
See all- CVE-2026-107181High
Telegram Desktop before 7.2.9 contains an IPC record-separator injection vulnerability in Core::Sandbox that allows remote attackers to inject OPEN: records via crafted tg:// links containing unescaped semicolons. Attackers can reach the interpret: scheme handler to upload local files, including tdata session keys, to an attacker channel, enabling account takeover.
- CVE-2021-47793High
Telegram Desktop 2.9.2 contains a denial of service vulnerability that allows attackers to crash the application by sending an oversized message payload. Attackers can generate a 9 million byte buffer and paste it into the messaging interface to trigger an application crash.
- CVE-2026-94488High
Telegram Desktop before 6.9.4 allows XSS in the HTML exporter. This occurs in button.text.toUtf8 in export_output_html.cpp. Exploitation cannot occur unless HTML export was used by a victim, but the exploit payload can be exported if a message were forwarded into a group by a member.
Original NVD description (English source)
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."
Vulnerability data from NVD (NIST) · CISA KEV · EPSS