CVE-2026-24904

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 83% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
55(Attend)
EG Risk 55/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

January 29, 2026

Last Modified

June 17, 2026

Advisory Details (2)

Auto-updated Aug 9, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit.
github Patch Available🟡 PoC Available

`client_random_prefix` rule bypass via fragmented or partial TLS ClientHello · Advisory · TrustTunnel/TrustTunnel · GitHub

https://github.com/TrustTunnel/TrustTunnel/security/advisories/GHSA-fqh7-r5gf-3r87
github_commit Patch Available

commit aa5060145506 (TrustTunnel/TrustTunnel)

Patch available: TrustTunnel/TrustTunnel v0.9.115 (contains commit aa5060145506)

https://github.com/TrustTunnel/TrustTunnel/commit/aa5060145506952b9431b0ed3edb52bb6c08d9a6

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 24× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 159 total refreshes for this CVE.

  1. 2026-09-20 20:15 UTCEPSS rescore
  2. 2026-09-19 00:00 UTCOSV refresh
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  75. 2026-06-30 23:22 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-24904?
CVE-2026-24904 is a medium vulnerability published on January 29, 2026. TrustTunnel is an open-source VPN protocol with a rule bypass issue in versions prior to 0.9.115. In tlslistener.rs, TlsListener::listen() peeks 1024 bytes and calls extractclientrandom(...). If parsetlsplaintext fails (for example, a fragmented/partial ClientHello split across TCP writes),…
When was CVE-2026-24904 disclosed?
CVE-2026-24904 was first published in the National Vulnerability Database on January 29, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-24904 actively exploited?
CVE-2026-24904 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 80.9% of all scored CVEs.
What is the CVSS score of CVE-2026-24904?
CVE-2026-24904 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-24904?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-24904, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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