CVE-2025-35436Network attack vector

Unauthenticated API crash via unchecked email errors

Published Sep 17, 2025 · Updated Sep 17, 2025

Uncaught exception in Thorium before commit 6a65a27 allows remote attackers to crash the API through account-verification email handling. EmailClient::send unwraps recipient parsing, message construction, and SMTP send results instead of returning API errors. Email verification must be enabled, and a malformed address or failed email response can terminate the API service without affecting data confidentiality or integrity.

CVSS severity6.9
Medium
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Uncaught exception in Thorium before commit 6a65a27 allows remote attackers to crash the API through account-verification email handling. EmailClient::send unwraps recipient parsing, message construction, and SMTP send results instead of returning API errors. Email verification must be enabled, and a malformed address or failed email response can terminate the API service without affecting data confidentiality or integrity.

The record

CVE
CVE-2025-35436
Published
Sep 17, 2025
Updated
Sep 17, 2025
Vendor
Cybersecurity and Infrastructure Security Agency (CISA)
Product
Thorium
Classifications
CWE-248, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=1.0.0 <6a65a27

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cybersecurity and Infrastructure Security Agency (CISA) · Thoriumversion=1.0.0 <6a65a27

Published CVSS scores

6.9Cybersecurity and Infrastructure Security AgencyCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
5.3Cybersecurity and Infrastructure Security AgencyCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-248Uncaught Exception
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo