TI-2025-02521 Aliases CVE-2025-2886 GHSA-v4wr-j3w6-mxqc

Terminating targets role delegations are not respected in tough

LOW 26CWE-670Published 2025-03-27 · Updated 2025-10-14

Key facts

Attack vector: Network
Privileges required: High
User interaction: Passive
Attack complexity: High
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: None · High · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.

Summary

Missing validation of terminating delegation causes the client to continue searching the defined delegation list, even after searching a terminating delegation. This could cause the client to fetch a target from an incorrect source, altering the target contents. Users should upgrade to tough version 0.20.0 or later and ensure any forked or derivative code is patched to incorporate the new fixes.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00332 26th percentileScored 2026-11-07

Fix Fixed tough (AWS): 0.20.0tough (crates.io): 0.20.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
AWS	tough	0.1.0 to before 0.20.0	0.20.0	Patch available	CNA
—	tough (crates.io)	before 0.20.0	0.20.0	Patch available	GHSA-v4wr-j3w6-mxqc

tough VendorAWS Affected 0.1.0 to before 0.20.0 Fixed in 0.20.0 Patch available CNA
tough (crates.io) Vendor— Affected before 0.20.0 Fixed in 0.20.0 Patch available GHSA-v4wr-j3w6-mxqc

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:amazon:tough::::::rust::*	before 0.20.0	Vulnerable	AWS

cpe:2.3:a:amazon:tough:*:*:*:*:*:rust:*:* Versions before 0.20.0 Vulnerable ·AWS

Remediation

Fix · CNA tough (AWS) Fixed in 0.20.0
Fix · GHSA-v4wr-j3w6-mxqc tough (crates.io) Fixed in 0.20.0 Advisory →

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Advisory · 2025-03-27
AWS tough — aws.amazon.com/security/security-bulletins/AWS-2025-007
4 records Highest priority Priority LOW 4 LOW
Other records, highest priority first
- TI-2025-02523 Improper timestamp caching during snapshot rollback in toughPriority LOW 26
- TI-2025-02522 Failure to detect delegated target rollback in toughPriority LOW 26
- TI-2025-02520 Root metadata version not validated in toughPriority LOW 26
Show all 4 records → Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2025-2886
2026-10-03 Alias added: GHSA-v4wr-j3w6-mxqc

References

Patch 1

https://github.com/awslabs/tough/releases/tag/tough-v0.20.0

Advisory 3

Other 3

TI-2020-11868 Improper verification of signature threshold in tough CVSS 3.1HIGH 8.6
TI-2021-17989 Improper sanitization of delegated role names in tough CVSS 3.1HIGH 8.2
TI-2021-17988 Improper sanitization of target names in tough CVSS 3.1HIGH 8.2
TI-2026-06100 Multiple Path Traversal Variants in awslabs/tough CVSS 4.0HIGH 7.1
TI-2026-06099 Missing Delegated Metadata Validation in awslabs/tough CVSS 4.0HIGH 7.1
TI-2026-06098 Signature Threshold Bypass in awslabs/tough Delegated Roles CVSS 4.0HIGH 7.0

See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences