CVE-2026-6967

Status: AnalyzedHigh (7.1)—

Missing expiration, hash, and length enforcement in delegated metadata validation in awslabs/tough before tough-v0.22.0 allows remote authenticated users with delegated signing authority to bypass TUF specification integrity checks for delegated targets metadata and poison the local metadata cache, because load_delegations does not apply the same validation checks as the top-level targets metadata path.

We recommend you upgrade to tough-v0.22.0 / tuftool-v0.15.0.

CVSS

Version: 4.0
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Base score: 7.1

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.30%
Percentile among all scored CVEs: 21
Score date: 10/5/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1210 Exploitation of Remote Serviceslateral movement85 %
Primary impactT1195.002 Compromise Software Supply Chaininitial access90 %
Secondary impactT1565.001 Stored Data Manipulationimpact75 %

CVE en TUF (The Update Framework): usuario autenticado remoto con autoridad de firma delegada omite validaciones de integridad de metadatos delegados (hash, expiración, longitud), envenenando la caché local. Ataque a cadena de suministro / manipulación de actualizaciones.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Vulnerability Scanning Update Software Threat Intelligence Program Restrict File and Directory Permissions Privileged Account Management Remote Data Storage

Affected technologies (2)

Amazon — Tough Amazon — Tuftool

CWEs

CWE-345

References

Raw JSON (NVD)

Show

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