{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-5448", "assignerOrgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27", "state": "PUBLISHED", "assignerShortName": "wolfSSL", "dateReserved": "2026-04-02T20:24:47.039Z", "datePublished": "2026-04-09T23:18:15.780Z", "dateUpdated": "2026-04-09T23:18:15.780Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27", "shortName": "wolfSSL", "dateUpdated": "2026-04-09T23:18:15.780Z"}, "title": "1-2 Byte Buffer Overflow in wolfSSL_X509_notAfter/notBefore", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-122", "description": "CWE-122 Heap-based Buffer Overflow", "type": "CWE"}]}], "affected": [{"vendor": "wolfSSL", "product": "wolfSSL", "repo": "https://github.com/wolfSSL/wolfssl", "versions": [{"status": "affected", "version": "0", "lessThan": "5.9.1", "versionType": "server"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "X.509 date buffer overflow in wolfSSL_X509_notAfter / wolfSSL_X509_notBefore. A buffer overflow may occur when parsing date fields from a crafted X.509 certificate via the compatibility layer API. This is only triggered when calling these two APIs directly from an application, and does not affect TLS or certificate verify operations in wolfSSL.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>X.509 date buffer overflow in wolfSSL_X509_notAfter / wolfSSL_X509_notBefore. A buffer overflow may occur when parsing date fields from a crafted X.509 certificate via the compatibility layer API. This is only triggered when calling these two APIs directly from an application, and does not affect TLS or certificate verify operations in wolfSSL.</p>"}]}], "references": [{"url": "https://github.com/wolfSSL/wolfssl/pull/10071"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "ADJACENT", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "GREEN", "version": "4.0", "baseSeverity": "LOW", "baseScore": 2.3, "vectorString": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/U:Green"}}], "credits": [{"lang": "en", "value": "Sunwoo Lee, Korea Institute of Energy Technology (KENTECH)", "type": "finder"}, {"lang": "en", "value": "Seunghyun Yoon, Korea Institute of Energy Technology (KENTECH)", "type": "finder"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.1"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "X.509 date buffer overflow in wolfSSL_X509_notAfter / wolfSSL_X509_notBefore. A buffer overflow may occur when parsing date fields from a crafted X.509 certificate via the compatibility layer API. This is only triggered when calling these two APIs directly from an application, and does not affect TLS or certificate verify operations in wolfSSL."}], "id": "CVE-2026-5448", "lastModified": "2026-04-10T00:16:35.890", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "ADJACENT", "availabilityRequirement": "NOT_DEFINED", "baseScore": 2.3, "baseSeverity": "LOW", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "GREEN", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/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:Green", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "facts@wolfssl.com", "type": "Secondary"}]}, "published": "2026-04-10T00:16:35.890", "references": [{"source": "facts@wolfssl.com", "url": "https://github.com/wolfSSL/wolfssl/pull/10071"}], "sourceIdentifier": "facts@wolfssl.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}], "source": "facts@wolfssl.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,5.9.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "wolfSSL", "source": "cna", "vendor": "wolfSSL"}, "product": "wolfssl", "vendor": "wolfssl"}], "analysis": {"en": {"generated_at": "2026-04-10T00:21:30.139292+00:00", "value": {"mitigation_remediation": ["Update wolfSSL to the latest release containing the fix for the X.509 date buffer overflow", "Verify that application code no longer directly calls the vulnerable notAfter/notBefore API functions", "Monitor logs and stability indicators for signs of memory corruption or unexpected crashes"], "summary": {"action": "Apply Patch", "impact": "Memory Corruption (Buffer Overflow)"}, "threat_synthesis": {"affected_systems": "The affected product is the wolfSSL SSL/TLS library. No specific version information is provided, so any release containing the unpatched functions may be vulnerable. All installations of wolfSSL that use the compatibility layer functions for certificate date parsing should be considered at risk.", "description_and_impact": "The vulnerability is a 1\u2011to\u20112\u2011byte buffer overflow that occurs when parsing the notAfter and notBefore fields of an X.509 certificate via the compatibility layer API. This flaw could corrupt memory in the calling application, potentially leading to crashes or arbitrary code execution if exploited. However, the impact is limited to code that directly invokes these APIs and does not affect TLS or certificate verification paths.", "risk_and_exploitability": "The CVSS score of 2.3 signifies low overall severity, and the vulnerability is not listed in the CISA KEV catalog, with no EPSS data available. Exploitation requires an attacker to supply a crafted certificate to an application that calls the vulnerable API functions directly. Because TLS and routine certificate verification are unaffected, the likelihood of widespread exploitation is low, but the defect can still compromise the stability or integrity of the vulnerable application."}}}}, "created": "2026-04-10T08:36:26.757540+00:00", "updated": "2026-04-10T09:27:26.448384+00:00", "vendors": ["wolfssl", "wolfssl$PRODUCT$wolfssl"]}