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CVE-2026-55526— PraisonAI: SSRF protection bypass in `spider_tools._host_is_blocked()` via DNS-resolved hostnames (`127.0.0.1.nip.io`)

Quick assessment

Affected
MervinPraison PraisonAI
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mervin Praison PraisonAI是Mervin Praison个人开发者开源的一个低代码多智能体协作框架。 Mervin Praison PraisonAI 4.6.58之前版本和praisonaiagents 1.6.58之前版本存在安全漏洞，该漏洞源于spider_tools._host_is_blocked()在获取页面之前未解析普通主机名，导致类似127.0.0.1.nip.io的主机名通过验证并解析到回环地址，可能允许内部HTTP访问。

CVSS 8.5 · High EPSS 0.36% · P27

Affected Version Matrix 2

VendorProduct Version RangeStatus
MervinPraison PraisonAI < 4.6.58 affected
MervinPraison praisonaiagents < 1.6.58 affected
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I. Basic Information for CVE-2026-55526

Vulnerability Information
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Vulnerability Title
PraisonAI: SSRF protection bypass in `spider_tools._host_is_blocked()` via DNS-resolved hostnames (`127.0.0.1.nip.io`)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不恰当地信任反向DNS
Source: CVE Program / CVE List V5
Vulnerability Title
Mervin Praison PraisonAI 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mervin Praison PraisonAI是Mervin Praison个人开发者开源的一个低代码多智能体协作框架。 Mervin Praison PraisonAI 4.6.58之前版本和praisonaiagents 1.6.58之前版本存在安全漏洞，该漏洞源于spider_tools._host_is_blocked()在获取页面之前未解析普通主机名，导致类似127.0.0.1.nip.io的主机名通过验证并解析到回环地址，可能允许内部HTTP访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
MervinPraison PraisonAI < 4.6.58 -
MervinPraison praisonaiagents < 1.6.58 -

II. Public POCs for CVE-2026-55526

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AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
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claude_code · 8828 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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POC zip download
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III. Intelligence Information for CVE-2026-55526

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Patches & Fixes for CVE-2026-55526 (1)

Vendor Advisories for CVE-2026-55526 (1)

Same Patch Batch · MervinPraison · 2026-08-25 · 17 CVEs total

CVE-2026-55536 9.1 CRITICAL Browser Server WebSocket origin validation bypass via unanchored regex (patch bypass of CV
CVE-2026-55541 8.8 HIGH PraisonAI: `--api-key` flag on `praisonai serve` is not properly enforced
CVE-2026-55534 8.6 HIGH PraisonAI serve agents --api-key is ignored, allowing unauthenticated remote agent executi
CVE-2026-55539 8.6 HIGH PraisonAI: [Auth Bypass] PraisonAI async Jobs API (`/api/v1/runs`) has no authentication —
CVE-2026-55528 8.2 HIGH praisonaiagents: AgentServer declares auth_token but never enforces it on any route (CWE-8
CVE-2026-55533 8.2 HIGH PraisonAI: Authentication fail-open in Recipe server allows unauthenticated access when AP
CVE-2026-55532 7.6 HIGH PraisonAI: Origin-validation bypass (startswith prefix match) enables unauthenticated cros
CVE-2026-55525 7.5 HIGH PraisonAI: SSRF via redirect-following in praisonaiagents web_crawl
CVE-2026-55538 7.3 HIGH PraisonAI: [Auth Bypass] `praisonai serve agents --api-key` is silently ignored — agent-in
CVE-2026-55537 7.1 HIGH PraisonAI: Webhook SSRF via DNS fail-open in `JobSubmitRequest.validate_webhook_url()` — b
CVE-2026-55527 7.1 HIGH PraisonAI: Arbitrary file write via unsanitized `user_id` in `FileMemory.__init__()` — pat
CVE-2026-55540 7.1 HIGH PraisonAI: [Path Traversal] agent tools escape the configured workspace via symlinks
CVE-2026-55529 6.9 MEDIUM PraisonAI: Origin validation bypass in MCP HTTP Stream transport allows browser-mediated u
CVE-2026-55535 6.8 MEDIUM PraisonAI: Server-Side Request Forgery via DNS rebinding bypass in webhook_url validation
CVE-2026-55531 6.5 MEDIUM PraisonAI: Unauthenticated unbounded session accumulation in the PraisonAI MCP HTTP server
CVE-2026-55530 6.1 MEDIUM PraisonAI: ast_grep_rewrite rewrites arbitrary files without the @require_approval gate en

IV. Related Vulnerabilities

Same product: PraisonAI
Same vendor: MervinPraison
Same weakness: CWE-350

V. Comments for CVE-2026-55526

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