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


- **Severity:** Medium 5.7 (`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`)
- **Exploited in the wild:** Not known
- **Fix available:** Yes
- **Published:** 27 Mar 2025
- **Updated:** 14 Oct 2025
- **Also known as:** GHSA-v4wr-j3w6-mxqc

## What is CVE-2025-2886?

CVE-2025-2886 is a medium-severity vulnerability in AWS tough, published on 27 Mar 2025. 

### 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.

Weakness: CWE-670 (Always-Incorrect Control Flow Implementation)

## Which versions are affected by CVE-2025-2886?

2 open source packages ship an affected version, including tough. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `tough` | crates.io | All versions | 0.20.0 |
| `tough` | crates.io | All versions | 0.20.0 |

Products: Amazon Tough.

## How do I fix CVE-2025-2886?

Upgrade tough to 0.20.0 or later.

## Is CVE-2025-2886 being exploited?

There is no known exploitation of CVE-2025-2886 in the wild and no public exploit code.

## Other vulnerabilities in AWS tough

- [CVE-2020-15093](https://insights.sbomify.com/CVE-2020-15093/): Improper verification of signature threshold in tough (high 8.6)
- [CVE-2021-41149](https://insights.sbomify.com/CVE-2021-41149/): Improper sanitization of target names in tough (high 8.2)
- [CVE-2021-41150](https://insights.sbomify.com/CVE-2021-41150/): Improper sanitization of delegated role names in tough (high 8.2)
- [CVE-2026-6967](https://insights.sbomify.com/CVE-2026-6967/): Missing Delegated Metadata Validation in awslabs/tough (high 7.1)
- [CVE-2026-6968](https://insights.sbomify.com/CVE-2026-6968/): Multiple Path Traversal Variants in awslabs/tough (high 7.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-2886 and fix it if it is affected.

What it is: CVE-2025-2886 is a medium-severity vulnerability in AWS tough, published on 27 Mar 2025. 
Exploitation: There is no known exploitation of CVE-2025-2886 in the wild and no public exploit code.

Affected packages and fixed versions:
- tough (crates.io): affected all versions; fixed in 0.20.0
- tough (crates.io): affected all versions; fixed in 0.20.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-2886/ (Markdown: https://insights.sbomify.com/CVE-2025-2886/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-2886
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-2886
- OSV: https://osv.dev/vulnerability/CVE-2025-2886

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-2886/
Summaries are generated and may contain mistakes; the official description above is the record.