CVE-2026-103680

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-103680", "assignerOrgId": "92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5", "state": "PUBLISHED", "assignerShortName": "fedora", "dateReserved": "2026-10-01T09:06:43.923Z", "datePublished": "2026-10-01T11:34:51.984Z", "dateUpdated": "2026-10-01T14:58:06.254Z"}, "containers": {"cna": {"title": "Tnef: heap buffer overflow in find_free_number() via numbered-backup suffix generation", "metrics": [{"other": {"content": {"value": "Low", "namespace": "https://access.redhat.com/security/updates/classification/"}, "type": "Red Hat severity rating"}}, {"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 3.1, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L", "version": "3.1"}, "format": "CVSS"}], "descriptions": [{"lang": "en", "value": "A flaw was found in tnef. A heap-based buffer overflow can occur in the find_free_number() function when generating numbered backup suffixes for duplicate filenames. When numbered backups are enabled and file overwriting is disabled, an attacker can supply a specially crafted Transport Neutral Encapsulation Format (TNEF) file with an excessive number of colliding attachment filenames, causing the numeric counter to write past the allocated memory buffer. This issue may result in an application crash, leading to a Denial of Service (DoS), or potentially arbitrary code execution."}], "affected": [{"versions": [{"status": "affected", "version": "0", "versionType": "semver", "lessThanOrEqual": "1.4.18"}], "packageName": "tnef", "collectionURL": "https://github.com/verdammelt/tnef", "defaultStatus": "unaffected"}], "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-103680", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2544478", "name": "RHBZ#2544478", "tags": ["issue-tracking", "x_refsource_REDHAT"]}, {"url": "https://github.com/verdammelt/tnef"}], "datePublic": "2026-10-01T00:00:00.000Z", "problemTypes": [{"descriptions": [{"cweId": "CWE-787", "description": "Out-of-bounds Write", "lang": "en", "type": "CWE"}]}], "x_redhatCweChain": "CWE-787: Out-of-bounds Write", "timeline": [{"lang": "en", "time": "2026-09-30T19:37:30.000Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-10-01T00:00:00.000Z", "value": "Made public."}], "credits": [{"lang": "en", "value": "Red Hat would like to thank Julien Ahrens (RCE Security GmbH) for reporting this issue."}], "providerMetadata": {"orgId": "92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5", "shortName": "fedora", "dateUpdated": "2026-10-01T11:34:51.984Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-01T14:57:56.123447Z", "id": "CVE-2026-103680", "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": "2026-10-01T14:58:06.254Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-103680", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-01T14:57:56.123447Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-01T14:58:02.337Z"}}], "cna": {"title": "Tnef: heap buffer overflow in find_free_number() via numbered-backup suffix generation", "credits": [{"lang": "en", "value": "Red Hat would like to thank Julien Ahrens (RCE Security GmbH) for reporting this issue."}], "metrics": [{"other": {"type": "Red Hat severity rating", "content": {"value": "Low", "namespace": "https://access.redhat.com/security/updates/classification/"}}}, {"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 3.1, "attackVector": "NETWORK", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "REQUIRED", "attackComplexity": "HIGH", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}], "affected": [{"versions": [{"status": "affected", "version": "0", "versionType": "semver", "lessThanOrEqual": "1.4.18"}], "packageName": "tnef", "collectionURL": "https://github.com/verdammelt/tnef", "defaultStatus": "unaffected"}], "timeline": [{"lang": "en", "time": "2026-09-30T19:37:30.000Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-10-01T00:00:00.000Z", "value": "Made public."}], "datePublic": "2026-10-01T00:00:00.000Z", "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-103680", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2544478", "name": "RHBZ#2544478", "tags": ["issue-tracking", "x_refsource_REDHAT"]}, {"url": "https://github.com/verdammelt/tnef"}], "x_generator": {"engine": "cvelib 1.8.0"}, "descriptions": [{"lang": "en", "value": "A flaw was found in tnef. A heap-based buffer overflow can occur in the find_free_number() function when generating numbered backup suffixes for duplicate filenames. When numbered backups are enabled and file overwriting is disabled, an attacker can supply a specially crafted Transport Neutral Encapsulation Format (TNEF) file with an excessive number of colliding attachment filenames, causing the numeric counter to write past the allocated memory buffer. This issue may result in an application crash, leading to a Denial of Service (DoS), or potentially arbitrary code execution."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-787", "description": "Out-of-bounds Write"}]}], "providerMetadata": {"orgId": "92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5", "shortName": "fedora", "dateUpdated": "2026-10-01T11:34:51.984Z"}, "x_redhatCweChain": "CWE-787: Out-of-bounds Write"}}, "cveMetadata": {"cveId": "CVE-2026-103680", "state": "PUBLISHED", "dateUpdated": "2026-10-01T14:58:06.254Z", "dateReserved": "2026-10-01T09:06:43.923Z", "assignerOrgId": "92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5", "datePublished": "2026-10-01T11:34:51.984Z", "assignerShortName": "fedora"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"collectionURL": "https://github.com/verdammelt/tnef", "defaultStatus": "unaffected", "packageName": "tnef", "versions": [{"lessThanOrEqual": "1.4.18", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "patrick@puiterwijk.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:tnef_project:tnef:*:*:*:*:*:*:*:*", "matchCriteriaId": "D0971079-1960-4691-BA33-FDECDAAB7233", "versionEndIncluding": "1.4.18", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw was found in tnef. A heap-based buffer overflow can occur in the find_free_number() function when generating numbered backup suffixes for duplicate filenames. When numbered backups are enabled and file overwriting is disabled, an attacker can supply a specially crafted Transport Neutral Encapsulation Format (TNEF) file with an excessive number of colliding attachment filenames, causing the numeric counter to write past the allocated memory buffer. This issue may result in an application crash, leading to a Denial of Service (DoS), or potentially arbitrary code execution."}], "id": "CVE-2026-103680", "lastModified": "2026-10-05T13:42:10.633", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 3.1, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 1.4, "source": "patrick@puiterwijk.org", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-103680", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-01T14:57:56.123447Z", "version": "2.0.3"}}]}, "published": "2026-10-01T12:17:15.810", "references": [{"source": "patrick@puiterwijk.org", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/security/cve/CVE-2026-103680"}, {"source": "patrick@puiterwijk.org", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2544478"}, {"source": "patrick@puiterwijk.org", "tags": ["Product"], "url": "https://github.com/verdammelt/tnef"}], "sourceIdentifier": "patrick@puiterwijk.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "patrick@puiterwijk.org", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "product": "tnef", "vendor": "verdammelt"}], "created": "2026-10-01T12:30:07.585940+00:00", "updated": "2026-10-01T15:35:25.850648+00:00", "vendors": ["verdammelt", "verdammelt$PRODUCT$tnef"]}