CVE-2026-7701Public exploitNetwork attack vector

Client crash via null login URL dereference

Published May 3, 2026 · Updated May 3, 2026

Null pointer dereference in Telegram Desktop 6.7.0 through 6.7.5 allows remote attackers to crash the client through a Bot API login URL. RequestButton in Telegram/SourceFiles/boxes/url_auth_box.cpp dereferences null state reached when a login_url button is opened without connected websites. The targeted user must click the button; Telegram disputes security impact because the result is a one-time crash and relaunch restores service.

CVSS severity4.3
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in Telegram Desktop 6.7.0 through 6.7.5 allows remote attackers to crash the client through a Bot API login URL. RequestButton in Telegram/SourceFiles/boxes/url_auth_box.cpp dereferences null state reached when a login_url button is opened without connected websites. The targeted user must click the button; Telegram disputes security impact because the result is a one-time crash and relaunch restores service.

The record

CVE
CVE-2026-7701
Published
May 3, 2026
Updated
May 3, 2026
Vendor
Telegram
Product
Telegram Desktop
Classifications
CWE-476, CWE-404, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 3, 2026CVE publishedPublication date reported by the CVE source.
  2. May 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.7.0
  2. Affected versionversion=6.7.1
  3. Affected versionversion=6.7.2
  4. Affected versionversion=6.7.3
  5. Affected versionversion=6.7.4
  6. Affected versionversion=6.7.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Telegram · Telegram Desktopversion=6.7.0; version=6.7.1; version=6.7.2; version=6.7.3; version=6.7.4; version=6.7.5

Published CVSS scores

5.0VulDBAV:N/AC:L/Au:N/C:N/I:N/A:P
4.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
5.3VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
CWE-404Improper Resource Shutdown or Release
T1204.001User Execution: Malicious Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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