CVE-2026-54635: nessshon tonapi · Improper Authentication
Affects nessshon tonapiSource CVE Database V5
Not known to be exploited · CVSS 7.5 High : upgrade to 2.2.1 soon.
Data as of 27 Oct 2026, 05:11 UTC
- EPSS
- 0.5% chance of exploitation in 30 days – higher than 43% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 2.2.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 28 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade nessshon tonapi to 2.2.1.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| nessshontonapi | Affected
| Fixed in
|
AI-suggested
Upgrade pytonapi to version 2.2.1 or later, where this authentication bypass vulnerability is fixed. No other mitigations are specified or necessary once the update is applied.
Description
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 with the documented path argument, because setup() stores bearer tokens only under the default suffix paths and never adds the custom path to the token map, so self._tokens.get(path) returns None and the authentication guard is skipped. An unauthenticated remote attacker can POST forged payloads to the custom webhook endpoint and trigger victim-defined handlers. This issue is fixed in version 2.2.1.
References
- github.com/nessshon/tonapi/security/advisories/GHSA-3fcr-jvgp-7f58 (opens in a new tab)
- github.com/nessshon/tonapi/commit/854222b7ee68d3fb7b4d6d899d200f388483bd86 (opens in a new tab)
- github.com/nessshon/tonapi/releases/tag/v2.2.1 (opens in a new tab)
- github.com/pypa/advisory-database/tree/main/vulns/pytonapi/PYSEC-2026-3614.yaml (opens in a new tab)