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CVE-2026-55537— PraisonAI: Webhook SSRF via DNS fail-open in `JobSubmitRequest.validate_webhook_url()` — bypass of CVE-2026-40114

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.

MervinPraison PraisonAI是MervinPraison个人开发者的一个机器学习智能体平台。 MervinPraison PraisonAI 4.6.58之前版本存在安全漏洞，该漏洞源于对webhook_url验证不当，可能导致攻击者通过DNS更改将请求定向到内部服务。

CVSS 7.1 · High EPSS 0.27% · P17

Affected Version Matrix 1

VendorProduct Version RangeStatus
MervinPraison PraisonAI < 4.6.58 affected
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I. Basic Information for CVE-2026-55537

Vulnerability Information
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Vulnerability Title
PraisonAI: Webhook SSRF via DNS fail-open in `JobSubmitRequest.validate_webhook_url()` — bypass of CVE-2026-40114
Source: CVE Program / CVE List V5
Vulnerability Description
PraisonAI is a multi-agent teams system. Prior to praisonai 4.6.58, JobSubmitRequest.validate_webhook_url() accepts webhook_url when resolution raises socket.gaierror because the exception path uses except socket.gaierror: pass. JobExecutor._send_webhook() later performs a fresh lookup, allowing DNS changes to direct the request to an internal service. This issue is fixed in version 4.6.58.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
MervinPraison PraisonAI 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MervinPraison PraisonAI是MervinPraison个人开发者的一个机器学习智能体平台。 MervinPraison PraisonAI 4.6.58之前版本存在安全漏洞，该漏洞源于对webhook_url验证不当，可能导致攻击者通过DNS更改将请求定向到内部服务。
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 -

II. Public POCs for CVE-2026-55537

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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 · 9899 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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III. Intelligence Information for CVE-2026-55537

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Patches & Fixes for CVE-2026-55537 (2)

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-2026-55526 8.5 HIGH PraisonAI: SSRF protection bypass in `spider_tools._host_is_blocked()` via DNS-resolved ho
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-2026-55527 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-367

V. Comments for CVE-2026-55537

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