What is CVE-2026-54635?

CVE-2026-54635 is a high-severity vulnerability in Nessshon Tonapi, classified under Improper Authentication. CVSS score: 7.5/10. Published 2026-07-28.

How severe is CVE-2026-54635?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Nessshon Tonapi

CVE-2026-54635

pytonapi is a Python SDK for TONAPI that provides REST API, streaming, and webhook access to the TON blockchain. From 2.0.0 to 2.2.0, TonapiWebhookDispatcher fails to validate the Authorization header when a webhook handler is registered w…

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Nessshon Tonapi — versions >= 2.0.0, < 2.2.1

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-54635?: CVE-2026-54635 is a high-severity vulnerability in Nessshon Tonapi, classified under Improper Authentication. CVSS score: 7.5/10. Published 2026-07-28.
How severe is CVE-2026-54635?: High severity. CVSS v3 base score is 7.5 out of 10.