CVE-2026-7701 Telegram Desktop Bot API url_auth_box.cpp RequestButton null pointer dereference
A remote attacker can cause a one-time crash in Telegram Desktop via a null pointer dereference in the Bot API, though the vendor disputes its security impact.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-7701?
CVE-2026-7701 is a medium-severity vulnerability in Telegram Desktop, published on 3 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
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."
Which versions are affected by CVE-2026-7701?
How do I fix CVE-2026-7701?
No fix has been published for CVE-2026-7701 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-7701 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7701 exists.
Sources
Also known as DEBIAN-CVE-2026-7701, GHSA-8hhg-crp9-v482, UBUNTU-CVE-2026-7701.