{"dataType": "CVE_RECORD", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2026-25833", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "dateUpdated": "2026-04-01T19:21:41.191Z", "dateReserved": "2026-02-06T00:00:00.000Z", "datePublished": "2026-04-01T00:00:00.000Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-04-01T18:01:26.959Z"}, "descriptions": [{"lang": "en", "value": "Mbed TLS 3.5.0 to 3.6.5 fixed in 3.6.6 and 4.1.0 has a buffer overflow in the x509_inet_pton_ipv6() function"}], "affected": [{"vendor": "n/a", "product": "n/a", "versions": [{"version": "n/a", "status": "affected"}]}], "references": [{"url": "https://mbed-tls.readthedocs.io/en/latest/security-advisories/"}, {"url": "https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-inet-pton/"}], "problemTypes": [{"descriptions": [{"type": "text", "lang": "en", "description": "n/a"}]}]}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-121", "lang": "en", "description": "CWE-121 Stack-based Buffer Overflow"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-04-01T19:21:14.363192Z", "id": "CVE-2026-25833", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-01T19:21:41.191Z"}}]}, "dataVersion": "5.2"}

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.5.0,3.6.5]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "mbedtls", "vendor": "mbed-tls"}], "analysis": {"en": {"generated_at": "2026-04-02T02:53:44.224522+00:00", "value": {"mitigation_remediation": ["Verify your current Mbed TLS version and identify any build that uses 3.5.0\u20133.6.5 or pre\u20114.1.0 releases.", "Upgrade the library to a fixed version, such as Mbed TLS 3.6.6 or newer, or 4.1.0 or newer.", "Rebuild and redeploy your application to ensure the updated library is in use.", "Test the updated integration for functionality and stability.", "Monitor logs for any anomalous behavior and apply additional hardening if necessary."], "summary": {"action": "Immediate Patch", "impact": "Buffer Overflow in IP Parsing"}, "threat_synthesis": {"affected_systems": "Affected versions include Mbed TLS 3.5.0 through 3.6.5 inclusive and any 4.x releases prior to 4.1.0. The library is widely used in embedded systems, IoT devices, and network services, so many products built with these versions may be impacted.", "description_and_impact": "The vulnerability is a buffer overflow in the x509_inet_pton_ipv6 function of the Mbed TLS library. When parsing an IPv6 address, the function copies data into a fixed-size buffer without adequate bounds checking, which can lead to memory corruption. This flaw can potentially allow an attacker to execute arbitrary code or crash the application, compromising integrity and availability.", "risk_and_exploitability": "The CVSS score of 7.5 indicates high severity. No EPSS data is available, and the issue is not listed in the CISA KEV catalog. Based on the description, it is inferred that the overflow occurs when the function processes IPv6 addresses supplied from external input, so the likely attack vector is remote if the library is exposed to network traffic. Successful exploitation would require the attacker to supply a specially crafted IPv6 address to trigger memory corruption, but the precise prerequisites are not detailed in the advisory."}}}}, "created": "2026-04-02T07:51:28.479179+00:00", "updated": "2026-04-03T08:59:11.052859+00:00", "vendors": ["mbed-tls", "mbed-tls$PRODUCT$mbedtls"]}