{"api_version":"1","generated_at":"2026-04-23T00:40:35+00:00","cve":"CVE-2020-26137","urls":{"html":"https://cve.report/CVE-2020-26137","api":"https://cve.report/api/cve/CVE-2020-26137.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2020-26137","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-26137"},"summary":{"title":"CVE-2020-26137","description":"urllib3 before 1.25.9 allows CRLF injection if the attacker controls the HTTP request method, as demonstrated by inserting CR and LF control characters in the first argument of putrequest(). NOTE: this is similar to CVE-2020-26116.","state":"PUBLIC","assigner":"cve@mitre.org","published_at":"2020-09-30 18:15:00","updated_at":"2023-10-08 14:15:00"},"problem_types":["CWE-74"],"metrics":[],"references":[{"url":"https://lists.debian.org/debian-lts-announce/2021/06/msg00015.html","name":"[debian-lts-announce] 20210615 [SECURITY] [DLA 2686-1] python-urllib3 security update","refsource":"MLIST","tags":[],"title":"[SECURITY] [DLA 2686-1] python-urllib3 security update","mime":"text/html","httpstatus":"200","archivestatus":"503"},{"url":"https://lists.debian.org/debian-lts-announce/2023/10/msg00012.html","name":"[debian-lts-announce] 20231008 [SECURITY] [DLA 3610-1] python-urllib3 security update","refsource":"MLIST","tags":[],"title":"[SECURITY] [DLA 3610-1] python-urllib3 security update","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/urllib3/urllib3/pull/1800","name":"https://github.com/urllib3/urllib3/pull/1800","refsource":"MISC","tags":["Patch","Third Party Advisory"],"title":"Raise ValueError if method contains control characters by sethmlarson · Pull Request #1800 · urllib3/urllib3 · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.oracle.com/security-alerts/cpuoct2021.html","name":"https://www.oracle.com/security-alerts/cpuoct2021.html","refsource":"MISC","tags":[],"title":"Oracle Critical Patch Update Advisory - October 2021","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://usn.ubuntu.com/4570-1/","name":"USN-4570-1","refsource":"UBUNTU","tags":[],"title":"USN-4570-1: urllib3 vulnerability | Ubuntu security notices | Ubuntu","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://bugs.python.org/issue39603","name":"https://bugs.python.org/issue39603","refsource":"MISC","tags":["Issue Tracking","Vendor Advisory"],"title":"Issue 39603: [security] http.client: HTTP Header Injection in the HTTP method - Python tracker","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/urllib3/urllib3/commit/1dd69c5c5982fae7c87a620d487c2ebf7a6b436b","name":"https://github.com/urllib3/urllib3/commit/1dd69c5c5982fae7c87a620d487c2ebf7a6b436b","refsource":"MISC","tags":["Patch","Third Party Advisory"],"title":"Raise ValueError if method contains control characters (#1800) · urllib3/urllib3@1dd69c5 · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.oracle.com/security-alerts/cpujul2022.html","name":"N/A","refsource":"N/A","tags":[],"title":"Oracle Critical Patch Update Advisory - July 2022","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-26137","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-26137","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2020","cve_id":"26137","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"canonical","cpe5":"ubuntu_linux","cpe6":"16.04","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"esm","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"26137","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"canonical","cpe5":"ubuntu_linux","cpe6":"18.04","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"lts","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"26137","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"canonical","cpe5":"ubuntu_linux","cpe6":"20.04","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"lts","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"26137","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"debian","cpe5":"debian_linux","cpe6":"9.0","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"26137","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"oracle","cpe5":"communications_cloud_native_core_network_function_cloud_native_environment","cpe6":"22.2.0","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"26137","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"oracle","cpe5":"zfs_storage_appliance_kit","cpe6":"8.8","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"26137","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"python","cpe5":"urllib3","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"26137","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"python","cpe5":"urllib3","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2020-26137","qid":"159199","title":"Oracle Enterprise Linux Security Update for python-urllib3 (ELSA-2021-1631)"},{"cve":"CVE-2020-26137","qid":"159342","title":"Oracle Enterprise Linux Security Update for python27:2.7 (ELSA-2021-1761)"},{"cve":"CVE-2020-26137","qid":"159958","title":"Oracle Enterprise Linux Security Update for python (ELSA-2022-5235)"},{"cve":"CVE-2020-26137","qid":"178673","title":"Debian Security Update for python-urllib3 (DLA 2686-1)"},{"cve":"CVE-2020-26137","qid":"239307","title":"Red Hat Update for python27:2.7 (RHSA-2021:1761)"},{"cve":"CVE-2020-26137","qid":"239324","title":"Red Hat Update for python-urllib3 (RHSA-2021:1631)"},{"cve":"CVE-2020-26137","qid":"240523","title":"Red Hat Update for python (RHSA-2022:5235)"},{"cve":"CVE-2020-26137","qid":"257179","title":"CentOS Security Update for python (CESA-2022:5235)"},{"cve":"CVE-2020-26137","qid":"296070","title":"Oracle Solaris 11.4 Support Repository Update (SRU) 28.82.3 Missing (CPUOCT2020)"},{"cve":"CVE-2020-26137","qid":"352386","title":"Amazon Linux Security Advisory for python-urllib3: ALAS2-2021-1668"},{"cve":"CVE-2020-26137","qid":"377245","title":"Alibaba Cloud Linux Security Update for python (ALINUX2-SA-2022:0032)"},{"cve":"CVE-2020-26137","qid":"377557","title":"Alibaba Cloud Linux Security Update for python27:2.7 (ALINUX3-SA-2022:0112)"},{"cve":"CVE-2020-26137","qid":"501478","title":"Alpine Linux Security Update for py3-urllib3"},{"cve":"CVE-2020-26137","qid":"504334","title":"Alpine Linux Security Update for py3-urllib3"},{"cve":"CVE-2020-26137","qid":"6000046","title":"Debian Security Update for python-urllib3 (DLA 3610-1)"},{"cve":"CVE-2020-26137","qid":"670727","title":"EulerOS Security Update for python-urllib3 (EulerOS-SA-2021-2485)"},{"cve":"CVE-2020-26137","qid":"670783","title":"EulerOS Security Update for python-urllib3 (EulerOS-SA-2021-2541)"},{"cve":"CVE-2020-26137","qid":"670807","title":"EulerOS Security Update for python-urllib3 (EulerOS-SA-2021-2565)"},{"cve":"CVE-2020-26137","qid":"670870","title":"EulerOS Security Update for python-urllib3 (EulerOS-SA-2021-2485)"},{"cve":"CVE-2020-26137","qid":"750482","title":"OpenSUSE Security Update for python-urllib3 (openSUSE-SU-2020:2282-1)"},{"cve":"CVE-2020-26137","qid":"750493","title":"OpenSUSE Security Update for python-urllib3 (openSUSE-SU-2020:2237-1)"},{"cve":"CVE-2020-26137","qid":"750994","title":"SUSE Enterprise Linux Security Update for aws-cli, python-boto3, python-botocore, python-service_identity, python-trustme, python-urllib3 (SUSE-SU-2021:2817-1)"},{"cve":"CVE-2020-26137","qid":"750999","title":"OpenSUSE Security Update for aws-cli, python-boto3, python-botocore, python-service_identity, python-trustme, python-urllib3 (openSUSE-SU-2021:2817-1)"},{"cve":"CVE-2020-26137","qid":"751069","title":"OpenSUSE Security Update for aws-cli, python-boto3, python-botocore, python-service_identity, python-trustme, python-urllib3 (openSUSE-SU-2021:1206-1)"},{"cve":"CVE-2020-26137","qid":"751183","title":"SUSE Enterprise Linux Security Update for python-urllib3 (SUSE-SU-2021:3251-1)"},{"cve":"CVE-2020-26137","qid":"770046","title":"Red Hat OpenShift Container Platform 4.5.27 Packages and Security Update (RHSA-2021:0034)"},{"cve":"CVE-2020-26137","qid":"770108","title":"Red Hat OpenShift Container Platform 4.5 Security Update (RHSA-2021-0034)"},{"cve":"CVE-2020-26137","qid":"900194","title":"CBL-Mariner Linux Security Update for python-urllib3 1.24.2"},{"cve":"CVE-2020-26137","qid":"903598","title":"Common Base Linux Mariner (CBL-Mariner) Security Update for python-urllib3 (3694)"},{"cve":"CVE-2020-26137","qid":"940235","title":"AlmaLinux Security Update for python-urllib3 (ALSA-2021:1631)"},{"cve":"CVE-2020-26137","qid":"940311","title":"AlmaLinux Security Update for python27:2.7 (ALSA-2021:1761)"},{"cve":"CVE-2020-26137","qid":"960310","title":"Rocky Linux Security Update for python-urllib3 (RLSA-2021:1631)"},{"cve":"CVE-2020-26137","qid":"960420","title":"Rocky Linux Security Update for python27:2.7 (RLSA-2021:1761)"},{"cve":"CVE-2020-26137","qid":"980324","title":"Python (pip) Security Update for urllib3 (GHSA-wqvq-5m8c-6g24)"}]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"cve@mitre.org","ID":"CVE-2020-26137","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"n/a","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"urllib3 before 1.25.9 allows CRLF injection if the attacker controls the HTTP request method, as demonstrated by inserting CR and LF control characters in the first argument of putrequest(). NOTE: this is similar to CVE-2020-26116."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"url":"https://bugs.python.org/issue39603","refsource":"MISC","name":"https://bugs.python.org/issue39603"},{"url":"https://github.com/urllib3/urllib3/pull/1800","refsource":"MISC","name":"https://github.com/urllib3/urllib3/pull/1800"},{"url":"https://github.com/urllib3/urllib3/commit/1dd69c5c5982fae7c87a620d487c2ebf7a6b436b","refsource":"MISC","name":"https://github.com/urllib3/urllib3/commit/1dd69c5c5982fae7c87a620d487c2ebf7a6b436b"},{"refsource":"UBUNTU","name":"USN-4570-1","url":"https://usn.ubuntu.com/4570-1/"},{"refsource":"MLIST","name":"[debian-lts-announce] 20210615 [SECURITY] [DLA 2686-1] python-urllib3 security update","url":"https://lists.debian.org/debian-lts-announce/2021/06/msg00015.html"},{"url":"https://www.oracle.com/security-alerts/cpuoct2021.html","refsource":"MISC","name":"https://www.oracle.com/security-alerts/cpuoct2021.html"},{"url":"https://www.oracle.com/security-alerts/cpujul2022.html","refsource":"MISC","name":"https://www.oracle.com/security-alerts/cpujul2022.html"},{"refsource":"MLIST","name":"[debian-lts-announce] 20231008 [SECURITY] [DLA 3610-1] python-urllib3 security update","url":"https://lists.debian.org/debian-lts-announce/2023/10/msg00012.html"}]}},"nvd":{"publishedDate":"2020-09-30 18:15:00","lastModifiedDate":"2023-10-08 14:15:00","problem_types":["CWE-74"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM"},"exploitabilityScore":3.9,"impactScore":2.5},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:P/I:P/A:N","accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"NONE","baseScore":6.4},"severity":"MEDIUM","exploitabilityScore":10,"impactScore":4.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:*","versionEndExcluding":"1.25.9","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:22.2.0:*:*:*:*:*:*:*","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2020","CveId":"26137","Ordinal":"187556","Title":"CVE-2020-26137","CVE":"CVE-2020-26137","Year":"2020"},"notes":[{"CveYear":"2020","CveId":"26137","Ordinal":"1","NoteData":"urllib3 before 1.25.9 allows CRLF injection if the attacker controls the HTTP request method, as demonstrated by inserting CR and LF control characters in the first argument of putrequest(). NOTE: this is similar to CVE-2020-26116.","Type":"Description","Title":null},{"CveYear":"2020","CveId":"26137","Ordinal":"2","NoteData":"2020-09-29","Type":"Other","Title":"Published"},{"CveYear":"2020","CveId":"26137","Ordinal":"3","NoteData":"2021-10-20","Type":"Other","Title":"Modified"}]}}}