CVE-2022-2309

{"containers": {"cna": {"affected": [{"product": "lxml/lxml", "vendor": "lxml", "versions": [{"lessThan": "4.9.1", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "value": "NULL Pointer Dereference allows attackers to cause a denial of service (or application crash). This only applies when lxml is used together with libxml2 2.9.10 through 2.9.14. libxml2 2.9.9 and earlier are not affected. It allows triggering crashes through forged input data, given a vulnerable code sequence in the application. The vulnerability is caused by the iterwalk function (also used by the canonicalize function). Such code shouldn't be in wide-spread use, given that parsing + iterwalk would usually be replaced with the more efficient iterparse function. However, an XML converter that serialises to C14N would also be vulnerable, for example, and there are legitimate use cases for this code sequence. If untrusted input is received (also remotely) and processed via iterwalk function, a crash can be triggered."}], "metrics": [{"cvssV3_0": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.0"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-476", "description": "CWE-476 NULL Pointer Dereference", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2022-09-24T01:06:09.000Z", "orgId": "c09c270a-b464-47c1-9133-acb35b22c19a", "shortName": "@huntrdev"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://huntr.dev/bounties/8264e74f-edda-4c40-9956-49de635105ba"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/lxml/lxml/commit/86368e9cf70a0ad23cccd5ee32de847149af0c6f"}, {"name": "GLSA-202208-06", "tags": ["vendor-advisory", "x_refsource_GENTOO"], "url": "https://security.gentoo.org/glsa/202208-06"}, {"tags": ["x_refsource_CONFIRM"], "url": "https://security.netapp.com/advisory/ntap-20220915-0006/"}, {"name": "FEDORA-2022-ed0eeb6a20", "tags": ["vendor-advisory", "x_refsource_FEDORA"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/URHHSIBTPTALXMECRLAC2EVDNAFSR5NO/"}, {"name": "FEDORA-2022-ed17f59c1d", "tags": ["vendor-advisory", "x_refsource_FEDORA"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HGYC6L7ENH5VEGN3YWFBYMGKX6WNS7HZ/"}], "source": {"advisory": "8264e74f-edda-4c40-9956-49de635105ba", "discovery": "EXTERNAL"}, "title": "NULL Pointer Dereference in lxml/lxml", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security@huntr.dev", "ID": "CVE-2022-2309", "STATE": "PUBLIC", "TITLE": "NULL Pointer Dereference in lxml/lxml"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "lxml/lxml", "version": {"version_data": [{"version_affected": "<", "version_value": "4.9.1"}]}}]}, "vendor_name": "lxml"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "NULL Pointer Dereference allows attackers to cause a denial of service (or application crash). This only applies when lxml is used together with libxml2 2.9.10 through 2.9.14. libxml2 2.9.9 and earlier are not affected. It allows triggering crashes through forged input data, given a vulnerable code sequence in the application. The vulnerability is caused by the iterwalk function (also used by the canonicalize function). Such code shouldn't be in wide-spread use, given that parsing + iterwalk would usually be replaced with the more efficient iterparse function. However, an XML converter that serialises to C14N would also be vulnerable, for example, and there are legitimate use cases for this code sequence. If untrusted input is received (also remotely) and processed via iterwalk function, a crash can be triggered."}]}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.0"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-476 NULL Pointer Dereference"}]}]}, "references": {"reference_data": [{"name": "https://huntr.dev/bounties/8264e74f-edda-4c40-9956-49de635105ba", "refsource": "CONFIRM", "url": "https://huntr.dev/bounties/8264e74f-edda-4c40-9956-49de635105ba"}, {"name": "https://github.com/lxml/lxml/commit/86368e9cf70a0ad23cccd5ee32de847149af0c6f", "refsource": "MISC", "url": "https://github.com/lxml/lxml/commit/86368e9cf70a0ad23cccd5ee32de847149af0c6f"}, {"name": "GLSA-202208-06", "refsource": "GENTOO", "url": "https://security.gentoo.org/glsa/202208-06"}, {"name": "https://security.netapp.com/advisory/ntap-20220915-0006/", "refsource": "CONFIRM", "url": "https://security.netapp.com/advisory/ntap-20220915-0006/"}, {"name": "FEDORA-2022-ed0eeb6a20", "refsource": "FEDORA", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/URHHSIBTPTALXMECRLAC2EVDNAFSR5NO/"}, {"name": "FEDORA-2022-ed17f59c1d", "refsource": "FEDORA", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HGYC6L7ENH5VEGN3YWFBYMGKX6WNS7HZ/"}]}, "source": {"advisory": "8264e74f-edda-4c40-9956-49de635105ba", "discovery": "EXTERNAL"}}}, "adp": [{"title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://huntr.dev/bounties/8264e74f-edda-4c40-9956-49de635105ba"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/lxml/lxml/commit/86368e9cf70a0ad23cccd5ee32de847149af0c6f"}, {"name": "GLSA-202208-06", "tags": ["vendor-advisory", "x_refsource_GENTOO", "x_transferred"], "url": "https://security.gentoo.org/glsa/202208-06"}, {"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://security.netapp.com/advisory/ntap-20220915-0006/"}, {"name": "FEDORA-2022-ed0eeb6a20", "tags": ["vendor-advisory", "x_refsource_FEDORA", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/URHHSIBTPTALXMECRLAC2EVDNAFSR5NO/"}, {"name": "FEDORA-2022-ed17f59c1d", "tags": ["vendor-advisory", "x_refsource_FEDORA", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HGYC6L7ENH5VEGN3YWFBYMGKX6WNS7HZ/"}, {"url": "https://lists.debian.org/debian-lts-announce/2024/09/msg00021.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-04T16:09:31.952Z"}}]}, "cveMetadata": {"assignerOrgId": "c09c270a-b464-47c1-9133-acb35b22c19a", "assignerShortName": "@huntrdev", "cveId": "CVE-2022-2309", "datePublished": "2022-07-05T09:00:12.000Z", "dateReserved": "2022-07-05T00:00:00.000Z", "dateUpdated": "2025-11-04T16:09:31.952Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.2"}

{}

{"affected": [{"affectedData": [{"product": "lxml/lxml", "vendor": "lxml", "versions": [{"lessThan": "4.9.1", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "source": "security@huntr.dev"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:lxml:lxml:*:*:*:*:*:*:*:*", "matchCriteriaId": "738BCE63-2B47-4CFA-9915-C3DE1A3AA9A9", "versionEndExcluding": "4.9.1", "vulnerable": true}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*", "matchCriteriaId": "E1774300-F6CA-43CA-A6FD-6A302814FB5D", "versionEndIncluding": "2.9.14", "versionStartIncluding": "2.9.10", "vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*", "matchCriteriaId": "5C675112-476C-4D7C-BCB9-A2FB2D0BC9FD", "vulnerable": true}, {"criteria": "cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*", "matchCriteriaId": "E30D0E6F-4AE8-4284-8716-991DFA48CC5D", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "NULL Pointer Dereference allows attackers to cause a denial of service (or application crash). This only applies when lxml is used together with libxml2 2.9.10 through 2.9.14. libxml2 2.9.9 and earlier are not affected. It allows triggering crashes through forged input data, given a vulnerable code sequence in the application. The vulnerability is caused by the iterwalk function (also used by the canonicalize function). Such code shouldn't be in wide-spread use, given that parsing + iterwalk would usually be replaced with the more efficient iterparse function. However, an XML converter that serialises to C14N would also be vulnerable, for example, and there are legitimate use cases for this code sequence. If untrusted input is received (also remotely) and processed via iterwalk function, a crash can be triggered."}, {"lang": "es", "value": "Una desreferencia de puntero NULL permite a atacantes causar una denegaci\u00f3n de servicio (o bloqueo de la aplicaci\u00f3n).&#xa0;Esto solo se aplica cuando lxml se usa junto con libxml2 versiones 2.9.10 hasta 2.9.14.&#xa0;libxml2 versiones 2.9.9 y anteriores no est\u00e1n afectados.&#xa0;Permite desencadenar bloqueos por medio de datos de entrada falsificados, dada una secuencia de c\u00f3digo vulnerable en la aplicaci\u00f3n.&#xa0;La vulnerabilidad es causada por la funci\u00f3n iterwalk (tambi\u00e9n utilizada por la funci\u00f3n canonicalize).&#xa0;Dicho c\u00f3digo no deber\u00eda tener un uso generalizado, dado que parsing + iterwalk generalmente se reemplazar\u00eda con la funci\u00f3n iterparse m\u00e1s eficiente.&#xa0;Sin embargo, un convertidor XML que serializa a C14N tambi\u00e9n ser\u00eda vulnerable, por ejemplo, y existen casos de uso leg\u00edtimos para esta secuencia de c\u00f3digo.&#xa0;Si se recibe una entrada que no es de confianza (tambi\u00e9n de forma remota) y se procesa por medio de la funci\u00f3n iterwalk, se puede desencadenar un bloqueo"}], "id": "CVE-2022-2309", "lastModified": "2026-06-17T04:41:40.237", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.0"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "security@huntr.dev", "type": "Secondary"}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2022-07-05T10:15:08.763", "references": [{"source": "security@huntr.dev", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/lxml/lxml/commit/86368e9cf70a0ad23cccd5ee32de847149af0c6f"}, {"source": "security@huntr.dev", "tags": ["Exploit", "Issue Tracking", "Patch", "Third Party Advisory"], "url": "https://huntr.dev/bounties/8264e74f-edda-4c40-9956-49de635105ba"}, {"source": "security@huntr.dev", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HGYC6L7ENH5VEGN3YWFBYMGKX6WNS7HZ/"}, {"source": "security@huntr.dev", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/URHHSIBTPTALXMECRLAC2EVDNAFSR5NO/"}, {"source": "security@huntr.dev", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202208-06"}, {"source": "security@huntr.dev", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20220915-0006/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/lxml/lxml/commit/86368e9cf70a0ad23cccd5ee32de847149af0c6f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Issue Tracking", "Patch", "Third Party Advisory"], "url": "https://huntr.dev/bounties/8264e74f-edda-4c40-9956-49de635105ba"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2024/09/msg00021.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HGYC6L7ENH5VEGN3YWFBYMGKX6WNS7HZ/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/URHHSIBTPTALXMECRLAC2EVDNAFSR5NO/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202208-06"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20220915-0006/"}], "sourceIdentifier": "security@huntr.dev", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "security@huntr.dev", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2022:8226", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "python-lxml-0:4.6.5-3.el9", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2022-11-15T00:00:00Z"}], "bugzilla": {"description": "lxml: NULL Pointer Dereference in lxml", "id": "2107571", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2107571"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-476", "details": ["NULL Pointer Dereference allows attackers to cause a denial of service (or application crash). This only applies when lxml is used together with libxml2 2.9.10 through 2.9.14. libxml2 2.9.9 and earlier are not affected. It allows triggering crashes through forged input data, given a vulnerable code sequence in the application. The vulnerability is caused by the iterwalk function (also used by the canonicalize function). Such code shouldn't be in wide-spread use, given that parsing + iterwalk would usually be replaced with the more efficient iterparse function. However, an XML converter that serialises to C14N would also be vulnerable, for example, and there are legitimate use cases for this code sequence. If untrusted input is received (also remotely) and processed via iterwalk function, a crash can be triggered.", "A NULL Pointer dereference vulnerability found in lxml, caused by the iterwalk function (also used by the canonicalize function). This flaw can lead to a crash when the incorrect parser input occurs together with usages."], "name": "CVE-2022-2309", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "python38:3.8/python-lxml", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "python39:3.9/python-lxml", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "python-lxml", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "inkscape:flatpak/python-lxml", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:rhel_software_collections:3", "fix_state": "Not affected", "package_name": "rh-python38-python-lxml", "product_name": "Red Hat Software Collections"}], "public_date": "2022-07-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-2309\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-2309"], "threat_severity": "Moderate"}

{}