How severe is CVE-2026-6967?

CVE-2026-6967 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability low.

Is CVE-2026-6967 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-6967?

CVE-2026-6967 primarily affects Amazon Tough. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-6967?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-6967 have an EU (EUVD) identifier?

Yes. CVE-2026-6967 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25628.

When was CVE-2026-6967 published?

CVE-2026-6967 was published on 2026-04-24 and last updated on 2026-06-17.

CVE-2026-6967

CVE-2026-6967 is a medium-severity vulnerability in Amazon Tough with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-345.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v4: 7.1
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-25628
Weakness: CWE-345
Affected product: Amazon Tough
Published: 2026-04-24
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-6967?: 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.
How severe is CVE-2026-6967?: CVE-2026-6967 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability low.
Is CVE-2026-6967 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-6967?: CVE-2026-6967 primarily affects Amazon Tough. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-6967?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-6967 have an EU (EUVD) identifier?: Yes. CVE-2026-6967 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25628.
When was CVE-2026-6967 published?: CVE-2026-6967 was published on 2026-04-24 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:amazon:tough:*:*:*:*:*:rust:*:*
cpe:2.3:a:amazon:tuftool:*:*:*:*:*:rust:*:*

More vulnerabilities in Amazon Tough

CVE-2020-15093 — High (CVSS 8.6): The tough library (Rust/crates.io) prior to version 0.7.1 does not properly verify the threshold of cryptographic…
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CVE-2026-6966 — Medium (CVSS 5.3): Improper verification of cryptographic signature uniqueness in delegated role validation in awslabs/tough before…
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