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CVE-2026-24904— TrustTunnel has `client_random_prefix` rule bypass via fragmented or partial TLS ClientHello

Quick assessment

Affected
TrustTunnel TrustTunnel
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TrustTunnel是TrustTunnel开源的一个VPN协议软件。 TrustTunnel 0.9.115之前版本存在访问控制错误漏洞，该漏洞源于规则评估逻辑缺陷，可能导致依赖client_random_prefix匹配的规则被跳过。

CVSS 5.3 · Medium EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2026-24904

Vulnerability Information
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Vulnerability Title
TrustTunnel has `client_random_prefix` rule bypass via fragmented or partial TLS ClientHello
Source: CVE Program / CVE List V5
Vulnerability Description
TrustTunnel is an open-source VPN protocol with a rule bypass issue in versions prior to 0.9.115. In `tls_listener.rs`, `TlsListener::listen()` peeks 1024 bytes and calls `extract_client_random(...)`. If `parse_tls_plaintext` fails (for example, a fragmented/partial ClientHello split across TCP writes), `extract_client_random` returns `None`. In `rules.rs`, `RulesEngine::evaluate` only evaluates `client_random_prefix` when `client_random` is `Some(...)`. As a result, when extraction fails (`client_random == None`), any rule that relies on `client_random_prefix` matching is skipped and evaluation falls through to later rules. As an important semantics note: `client_random_prefix` is a match condition only. It does not mean "block non-matching prefixes" by itself. A rule with `client_random_prefix = ...` triggers its `action` only when the prefix matches (and the field is available to evaluate). Non-matches (or `None`) simply do not match that rule and continue to fall through. The vulnerability is fixed in version 0.9.115.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
TrustTunnel 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TrustTunnel是TrustTunnel开源的一个VPN协议软件。 TrustTunnel 0.9.115之前版本存在访问控制错误漏洞，该漏洞源于规则评估逻辑缺陷，可能导致依赖client_random_prefix匹配的规则被跳过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
TrustTunnel TrustTunnel < 0.9.115 -

II. Public POCs for CVE-2026-24904

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III. Intelligence Information for CVE-2026-24904

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Vendor Advisories for CVE-2026-24904 (1)

IV. Related Vulnerabilities

Same product: TrustTunnel
Same vendor: TrustTunnel
Same weakness: CWE-284

V. Comments for CVE-2026-24904

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