Vulnerability · Published Mar 27, 2025 · Assigned by AMZN

CVE-2025-2886Terminating targets role delegations are not respected in tough

Medium 5.7

In plain English

A medium-severity security flaw in tough from AWS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities).

Severity (CVSS 4.0)5.7Medium

Exploit odds (30 days)0.3%top 73.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
AWS	tough	0.1.0 – before 0.20.0

Weakness: CWE-670 · Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

References

https://github.com/awslabs/tough/security/advisories/GHSA-v4wr-j3w6-mxqc vendor-advisory
https://aws.amazon.com/security/security-bulletins/AWS-2025-007/ vendor-advisory
https://github.com/awslabs/tough/releases/tag/tough-v0.20.0 patch