CVE-2026-39890 — AI Deep Analysis Summary

🚨 **Essence**: PraisonAI (low-code multi-agent framework) has a critical code flaw. 📉 **Consequences**: Remote Code Execution (RCE) is possible due to unsafe YAML parsing. ⚠️ **Impact**: Full system compromise.

🛡️ **CWE**: CWE-502 (Deserialization of Untrusted Data). 🔍 **Flaw**: YAML parser does **not** disable dangerous tags. 🧪 **Result**: Malicious YAML payloads execute arbitrary code.

👤 **Vendor**: Mervin Praison. 📦 **Product**: PraisonAI. 📅 **Affected**: Versions **before 4.5.115**. ✅ **Safe**: v4.5.115 and later.

💻 **Privileges**: Attacker gains **Remote Code Execution**. 🔓 **Data**: Full access to system resources. 🌐 **Scope**: Network-accessible (AV:N), Low complexity (AC:L).

🔓 **Auth**: None required (PR:N). 👁️ **UI**: No user interaction needed (UI:N). 🌍 **Access**: Network vector (AV:N). 📉 **Threshold**: **LOW**. Easy to exploit remotely.

🚫 **Public Exp**: No PoC listed in data. 🕵️ **Wild Exp**: Unconfirmed. ⚠️ **Risk**: Despite no public code, the CVSS is **Critical (9.8)** due to ease of exploitation.

🔍 **Check**: Scan for PraisonAI versions < 4.5.115. 📄 **Inspect**: Look for YAML input handling in agent workflows. 🛠️ **Tool**: Use SAST/DAST tools to detect unsafe YAML deserialization.

✅ **Fixed**: Yes. 📦 **Patch**: Upgrade to **PraisonAI v4.5.115+**. 🔗 **Ref**: [GitHub Advisory](https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-32vr-5gcf-3pw2).

🚧 **Workaround**: If upgrade impossible, **disable YAML loading** for untrusted inputs. 🛑 **Mitigation**: Strictly validate/sanitize all YAML data before parsing. 🚫 **Block**: Restrict network access to the service.

🔥 **Urgency**: **CRITICAL**. 🚨 **Priority**: Patch immediately. 📉 **CVSS**: 9.8 (High). ⏳ **Time**: Vulnerability published April 2026; act fast to prevent RCE.