PT-2026-35079 · Pypi · Tuftool+1

1Seal + 1 · CVE-2026-6966 · Published 2026-04-24 · Updated 2026-05-21

Positive Technologies (AI Summary)

CVSS v4.0

7.0

High

Base vector

AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N

Name of the Vulnerable Software and Affected Versions awslabs/tough versions prior to 0.22.0

Description Improper verification of cryptographic signature uniqueness in delegated role validation allows remote authenticated users to bypass the TUF signature threshold requirement by duplicating a valid signature. This can cause the client to accept forged delegated role metadata.

Recommendations Upgrade to tough-v0.22.0 / tuftool-v0.15.0.

Exploit

Fix

Improper Verification of Cryptographic Signature

Weakness Enumeration

CWE-347

Related Identifiers

CVE-2026-6966

GHSA-8M7C-8M39-RV4X

Affected Products

Tough

Tuftool

References · 16

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6966.json · Exploit
• https://github.com/awslabs/tough/releases/tag/tough-v0.22.0 · Patch
• https://github.com/awslabs/tough/releases/tag/tuftool-v0.15.0 · Patch
• https://github.com/awslabs/tough/security/advisories/GHSA-8m7c-8m39-rv4x · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-6966 · Security Note
• https://crates.io/crates/tuftool/0.15.0 · Patch
• https://crates.io/crates/tough/0.22.0 · Patch
• https://osv.dev/vulnerability/GHSA-8m7c-8m39-rv4x · Vendor Advisory
• https://aws.amazon.com/security/security-bulletins/2026-019-aws · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-6966 · Vendor Advisory
• https://github.com/awslabs/tough · Note
• https://twitter.com/CVEnew/status/2047798562055209431 · Twitter Post
• https://twitter.com/lyrie_ai/status/2057378682373632222 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2047841418572390898 · Twitter Post
• https://twitter.com/lyrie_ai/status/2057378681459286022 · Twitter Post