Anubis has a bot protection bypass when a sophisticated attacker asks to pass a challenge of difficulty 0

Open Source Vulnerabilities GO-2025-3424

Anubis has a bot protection bypass when a sophisticated attacker asks to pass a challenge of difficulty 0 in github.com/Xe/x. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. (If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: github.com/Xe/x before v1.11.0-37-gd98d70a.

Open Source Vulnerabilities CVE-2025-24369

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.