{"api_version":"1","generated_at":"2026-04-26T15:29:21+00:00","cve":"CVE-2026-5246","urls":{"html":"https://cve.report/CVE-2026-5246","api":"https://cve.report/api/cve/CVE-2026-5246.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-5246","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-5246"},"summary":{"title":"Cesanta Mongoose P-384 Public Key mongoose.c mg_tls_verify_cert_signature authorization","description":"A vulnerability was determined in Cesanta Mongoose up to 7.20. Affected is the function mg_tls_verify_cert_signature of the file mongoose.c of the component P-384 Public Key Handler. Executing a manipulation can lead to authorization bypass. The attack can be executed remotely. Attacks of this nature are highly complex. The exploitability is told to be difficult. The exploit has been publicly disclosed and may be utilized. Upgrading to version 7.21 is able to address this issue. This patch is called 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1. The affected component should be upgraded. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.","state":"PUBLISHED","assigner":"VulDB","published_at":"2026-04-02 10:16:17","updated_at":"2026-04-03 16:10:52"},"problem_types":["CWE-285","CWE-639","CWE-639 Authorization Bypass","CWE-285 Improper Authorization"],"metrics":[{"version":"4.0","source":"cna@vuldb.com","type":"Secondary","score":"6.3","severity":"MEDIUM","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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","data":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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":6.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"PROOF_OF_CONCEPT","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"}},{"version":"4.0","source":"CNA","type":"DECLARED","score":"6.3","severity":"MEDIUM","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P","data":{"baseScore":6.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P","version":"4.0"}},{"version":"3.1","source":"cna@vuldb.com","type":"Primary","score":"5.6","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","baseScore":5.6,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"LOW"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"5.6","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C","data":{"baseScore":5.6,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C","version":"3.1"}},{"version":"3.0","source":"CNA","type":"DECLARED","score":"5.6","severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C","data":{"baseScore":5.6,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C","version":"3.0"}},{"version":"2.0","source":"cna@vuldb.com","type":"Secondary","score":"5.1","severity":"","vector":"AV:N/AC:H/Au:N/C:P/I:P/A:P","data":{"version":"2.0","vectorString":"AV:N/AC:H/Au:N/C:P/I:P/A:P","baseScore":5.1,"accessVector":"NETWORK","accessComplexity":"HIGH","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL"}},{"version":"2.0","source":"CNA","type":"DECLARED","score":"5.1","severity":"","vector":"AV:N/AC:H/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C","data":{"baseScore":5.1,"vectorString":"AV:N/AC:H/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C","version":"2.0"}}],"references":[{"url":"https://vuldb.com/submit/770104","name":"https://vuldb.com/submit/770104","refsource":"cna@vuldb.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/cesanta/mongoose/releases/tag/7.21","name":"https://github.com/cesanta/mongoose/releases/tag/7.21","refsource":"cna@vuldb.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://vuldb.com/vuln/354827","name":"https://vuldb.com/vuln/354827","refsource":"cna@vuldb.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://vuldb.com/vuln/354827/cti","name":"https://vuldb.com/vuln/354827/cti","refsource":"cna@vuldb.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/cesanta/mongoose/","name":"https://github.com/cesanta/mongoose/","refsource":"cna@vuldb.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/cesanta/mongoose/commit/0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1","name":"https://github.com/cesanta/mongoose/commit/0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1","refsource":"cna@vuldb.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-5246","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-5246","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Cesanta","product":"Mongoose","version":"affected 7.0","platforms":[]},{"source":"CNA","vendor":"Cesanta","product":"Mongoose","version":"affected 7.1","platforms":[]},{"source":"CNA","vendor":"Cesanta","product":"Mongoose","version":"affected 7.2","platforms":[]},{"source":"CNA","vendor":"Cesanta","product":"Mongoose","version":"affected 7.3","platforms":[]},{"source":"CNA","vendor":"Cesanta","product":"Mongoose","version":"affected 7.4","platforms":[]},{"source":"CNA","vendor":"Cesanta","product":"Mongoose","version":"affected 7.5","platforms":[]},{"source":"CNA","vendor":"Cesanta","product":"Mongoose","version":"affected 7.6","platforms":[]},{"source":"CNA","vendor":"Cesanta","product":"Mongoose","version":"affected 7.7","platforms":[]},{"source":"CNA","vendor":"Cesanta","product":"Mongoose","version":"affected 7.8","platforms":[]},{"source":"CNA","vendor":"Cesanta","product":"Mongoose","version":"affected 7.9","platforms":[]},{"source":"CNA","vendor":"Cesanta","product":"Mongoose","version":"affected 7.10","platforms":[]},{"source":"CNA","vendor":"Cesanta","product":"Mongoose","version":"affected 7.11","platforms":[]},{"source":"CNA","vendor":"Cesanta","product":"Mongoose","version":"affected 7.12","platforms":[]},{"source":"CNA","vendor":"Cesanta","product":"Mongoose","version":"affected 7.13","platforms":[]},{"source":"CNA","vendor":"Cesanta","product":"Mongoose","version":"affected 7.14","platforms":[]},{"source":"CNA","vendor":"Cesanta","product":"Mongoose","version":"affected 7.15","platforms":[]},{"source":"CNA","vendor":"Cesanta","product":"Mongoose","version":"affected 7.16","platforms":[]},{"source":"CNA","vendor":"Cesanta","product":"Mongoose","version":"affected 7.17","platforms":[]},{"source":"CNA","vendor":"Cesanta","product":"Mongoose","version":"affected 7.18","platforms":[]},{"source":"CNA","vendor":"Cesanta","product":"Mongoose","version":"affected 7.19","platforms":[]},{"source":"CNA","vendor":"Cesanta","product":"Mongoose","version":"affected 7.20","platforms":[]},{"source":"CNA","vendor":"Cesanta","product":"Mongoose","version":"unaffected 7.21","platforms":[]}],"timeline":[{"source":"CNA","time":"2026-04-02T00:00:00.000Z","lang":"en","value":"Advisory disclosed"},{"source":"CNA","time":"2026-04-02T02:00:00.000Z","lang":"en","value":"VulDB entry created"},{"source":"CNA","time":"2026-04-02T09:48:27.000Z","lang":"en","value":"VulDB entry last update"}],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"CNA","value":"the_evilsocket (VulDB User)","lang":"en"},{"source":"CNA","value":"VulDB CNA Team","lang":"en"}],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"5246","cve":"CVE-2026-5246","epss":"0.000450000","percentile":"0.138070000","score_date":"2026-04-07","updated_at":"2026-04-08 00:03:39"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-5246","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-04-02T13:06:36.226342Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-04-02T13:07:02.788Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"cpes":["cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*"],"modules":["P-384 Public Key Handler"],"product":"Mongoose","vendor":"Cesanta","versions":[{"status":"affected","version":"7.0"},{"status":"affected","version":"7.1"},{"status":"affected","version":"7.2"},{"status":"affected","version":"7.3"},{"status":"affected","version":"7.4"},{"status":"affected","version":"7.5"},{"status":"affected","version":"7.6"},{"status":"affected","version":"7.7"},{"status":"affected","version":"7.8"},{"status":"affected","version":"7.9"},{"status":"affected","version":"7.10"},{"status":"affected","version":"7.11"},{"status":"affected","version":"7.12"},{"status":"affected","version":"7.13"},{"status":"affected","version":"7.14"},{"status":"affected","version":"7.15"},{"status":"affected","version":"7.16"},{"status":"affected","version":"7.17"},{"status":"affected","version":"7.18"},{"status":"affected","version":"7.19"},{"status":"affected","version":"7.20"},{"status":"unaffected","version":"7.21"}]}],"credits":[{"lang":"en","type":"reporter","value":"the_evilsocket (VulDB User)"},{"lang":"en","type":"coordinator","value":"VulDB CNA Team"}],"descriptions":[{"lang":"en","value":"A vulnerability was determined in Cesanta Mongoose up to 7.20. Affected is the function mg_tls_verify_cert_signature of the file mongoose.c of the component P-384 Public Key Handler. Executing a manipulation can lead to authorization bypass. The attack can be executed remotely. Attacks of this nature are highly complex. The exploitability is told to be difficult. The exploit has been publicly disclosed and may be utilized. Upgrading to version 7.21 is able to address this issue. This patch is called 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1. The affected component should be upgraded. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product."}],"metrics":[{"cvssV4_0":{"baseScore":6.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P","version":"4.0"}},{"cvssV3_1":{"baseScore":5.6,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C","version":"3.1"}},{"cvssV3_0":{"baseScore":5.6,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C","version":"3.0"}},{"cvssV2_0":{"baseScore":5.1,"vectorString":"AV:N/AC:H/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C","version":"2.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-639","description":"Authorization Bypass","lang":"en","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-285","description":"Improper Authorization","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-04-02T09:45:11.602Z","orgId":"1af790b2-7ee1-4545-860a-a788eba489b5","shortName":"VulDB"},"references":[{"name":"VDB-354827 | Cesanta Mongoose P-384 Public Key mongoose.c mg_tls_verify_cert_signature authorization","tags":["vdb-entry","technical-description"],"url":"https://vuldb.com/vuln/354827"},{"name":"VDB-354827 | CTI Indicators (IOB, IOC, IOA)","tags":["signature","permissions-required"],"url":"https://vuldb.com/vuln/354827/cti"},{"name":"Submit #770104 | Cesanta Mongoose 7.20 Authorization Bypass","tags":["third-party-advisory"],"url":"https://vuldb.com/submit/770104"},{"tags":["patch"],"url":"https://github.com/cesanta/mongoose/commit/0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1"},{"tags":["patch"],"url":"https://github.com/cesanta/mongoose/releases/tag/7.21"},{"tags":["product"],"url":"https://github.com/cesanta/mongoose/"}],"tags":["x_open-source"],"timeline":[{"lang":"en","time":"2026-04-02T00:00:00.000Z","value":"Advisory disclosed"},{"lang":"en","time":"2026-04-02T02:00:00.000Z","value":"VulDB entry created"},{"lang":"en","time":"2026-04-02T09:48:27.000Z","value":"VulDB entry last update"}],"title":"Cesanta Mongoose P-384 Public Key mongoose.c mg_tls_verify_cert_signature authorization"}},"cveMetadata":{"assignerOrgId":"1af790b2-7ee1-4545-860a-a788eba489b5","assignerShortName":"VulDB","cveId":"CVE-2026-5246","datePublished":"2026-04-02T09:45:11.602Z","dateReserved":"2026-03-31T14:45:56.419Z","dateUpdated":"2026-04-02T13:07:02.788Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-04-02 10:16:17","lastModifiedDate":"2026-04-03 16:10:52","problem_types":["CWE-285","CWE-639","CWE-639 Authorization Bypass","CWE-285 Improper Authorization"],"metrics":{"cvssMetricV40":[{"source":"cna@vuldb.com","type":"Secondary","cvssData":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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":6.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"PROOF_OF_CONCEPT","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":"cna@vuldb.com","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","baseScore":5.6,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"LOW"},"exploitabilityScore":2.2,"impactScore":3.4}],"cvssMetricV2":[{"source":"cna@vuldb.com","type":"Secondary","cvssData":{"version":"2.0","vectorString":"AV:N/AC:H/Au:N/C:P/I:P/A:P","baseScore":5.1,"accessVector":"NETWORK","accessComplexity":"HIGH","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL"},"baseSeverity":"MEDIUM","exploitabilityScore":4.9,"impactScore":6.4,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"5246","Ordinal":"1","Title":"Cesanta Mongoose P-384 Public Key mongoose.c mg_tls_verify_cert_","CVE":"CVE-2026-5246","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"5246","Ordinal":"1","NoteData":"A vulnerability was determined in Cesanta Mongoose up to 7.20. Affected is the function mg_tls_verify_cert_signature of the file mongoose.c of the component P-384 Public Key Handler. Executing a manipulation can lead to authorization bypass. The attack can be executed remotely. Attacks of this nature are highly complex. The exploitability is told to be difficult. The exploit has been publicly disclosed and may be utilized. Upgrading to version 7.21 is able to address this issue. This patch is called 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1. The affected component should be upgraded. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.","Type":"Description","Title":"Cesanta Mongoose P-384 Public Key mongoose.c mg_tls_verify_cert_"}]}}}