{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-70368", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-08-04T07:03:23.572Z", "datePublished": "2026-08-04T13:52:25.255Z", "dateUpdated": "2026-08-04T14:21:27.297Z"}, "containers": {"cna": {"title": "Stunnel: stack-based out-of-bounds read/write in stunnel s_vlog via oversized log message", "metrics": [{"other": {"content": {"value": "Moderate", "namespace": "https://access.redhat.com/security/updates/classification/"}, "type": "Red Hat severity rating"}}, {"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L", "version": "3.1"}, "format": "CVSS"}], "descriptions": [{"lang": "en", "value": "A stack-based out-of-bounds read vulnerability exists in the \"s_vlog\" function of stunnel, when handling oversized log messages via \"vsnprintf\". A remote attacker with network access to a stunnel service can send protocol inputs that trigger a log message longer than 1024 bytes, leading to an out-of-bounds stack read and a potential crash. In certain corner cases, the same vulnerability could be used to replace a series of trailing \"\\n\" characters with \"\\0\"."}], "affected": [{"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "stunnel", "defaultStatus": "affected", "cpes": ["cpe:/o:redhat:enterprise_linux:10"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 6", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "stunnel", "defaultStatus": "unaffected", "cpes": ["cpe:/o:redhat:enterprise_linux:6"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 7", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "stunnel", "defaultStatus": "unaffected", "cpes": ["cpe:/o:redhat:enterprise_linux:7"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "stunnel", "defaultStatus": "affected", "cpes": ["cpe:/o:redhat:enterprise_linux:8"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "stunnel", "defaultStatus": "affected", "cpes": ["cpe:/o:redhat:enterprise_linux:9"]}], "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-70368", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2462029", "name": "RHBZ#2462029", "tags": ["issue-tracking", "x_refsource_REDHAT"]}], "datePublic": "2026-08-04T10:30:31.438Z", "problemTypes": [{"descriptions": [{"cweId": "CWE-125", "description": "Out-of-bounds Read", "lang": "en", "type": "CWE"}]}], "x_redhatCweChain": "CWE-125: Out-of-bounds Read", "workarounds": [{"lang": "en", "value": "To mitigate this issue, avoid exposing stunnel services to untrusted clients. Restrict access to these services to trusted networks only."}], "timeline": [{"lang": "en", "time": "2026-04-26T18:03:12.000Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-08-04T10:30:31.438Z", "value": "Made public."}], "credits": [{"lang": "en", "value": "This issue was discovered by Found by AISLE in partnership with Red Hat."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-08-04T13:52:25.255Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-04T14:21:17.494804Z", "id": "CVE-2026-70368", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"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": "2026-08-04T14:21:27.297Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-70368", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-04T14:21:17.494804Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-04T14:21:23.598Z"}}], "cna": {"title": "Stunnel: stack-based out-of-bounds read/write in stunnel s_vlog via oversized log message", "credits": [{"lang": "en", "value": "This issue was discovered by Found by AISLE in partnership with Red Hat."}], "metrics": [{"other": {"type": "Red Hat severity rating", "content": {"value": "Moderate", "namespace": "https://access.redhat.com/security/updates/classification/"}}}, {"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}], "affected": [{"cpes": ["cpe:/o:redhat:enterprise_linux:10"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "packageName": "stunnel", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:6"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 6", "packageName": "stunnel", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:7"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 7", "packageName": "stunnel", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:8"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "packageName": "stunnel", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:9"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "packageName": "stunnel", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}], "timeline": [{"lang": "en", "time": "2026-04-26T18:03:12.000Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-08-04T10:30:31.438Z", "value": "Made public."}], "datePublic": "2026-08-04T10:30:31.438Z", "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-70368", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2462029", "name": "RHBZ#2462029", "tags": ["issue-tracking", "x_refsource_REDHAT"]}], "workarounds": [{"lang": "en", "value": "To mitigate this issue, avoid exposing stunnel services to untrusted clients. Restrict access to these services to trusted networks only."}], "x_generator": {"engine": "cvelib 1.8.0"}, "descriptions": [{"lang": "en", "value": "A stack-based out-of-bounds read vulnerability exists in the \"s_vlog\" function of stunnel, when handling oversized log messages via \"vsnprintf\". A remote attacker with network access to a stunnel service can send protocol inputs that trigger a log message longer than 1024 bytes, leading to an out-of-bounds stack read and a potential crash. In certain corner cases, the same vulnerability could be used to replace a series of trailing \"\\n\" characters with \"\\0\"."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-125", "description": "Out-of-bounds Read"}]}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-08-04T13:52:25.255Z"}, "x_redhatCweChain": "CWE-125: Out-of-bounds Read"}}, "cveMetadata": {"cveId": "CVE-2026-70368", "state": "PUBLISHED", "dateUpdated": "2026-08-04T14:21:27.297Z", "dateReserved": "2026-08-04T07:03:23.572Z", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "datePublished": "2026-08-04T13:52:25.255Z", "assignerShortName": "redhat"}, "dataVersion": "5.2"}

{}

{"acknowledgement": "This issue was discovered by Found by AISLE in partnership with Red Hat.", "bugzilla": {"description": "stunnel: Stack-based out-of-bounds read/write in stunnel s_vlog via oversized log message", "id": "2462029", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2462029"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L", "status": "draft"}, "cwe": "CWE-125", "details": ["A stack-based out-of-bounds read vulnerability exists in the \"s_vlog\" function of stunnel, when handling oversized log messages via \"vsnprintf\". A remote attacker with network access to a stunnel service can send protocol inputs that trigger a log message longer than 1024 bytes, leading to an out-of-bounds stack read and a potential crash. In certain corner cases, the same vulnerability could be used to replace a series of trailing \"\\n\" characters with \"\\0\"."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, avoid exposing stunnel services to untrusted clients. Restrict access to these services to trusted networks only."}, "name": "CVE-2026-70368", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "stunnel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "stunnel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "stunnel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "stunnel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "stunnel", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-04T10:30:31Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-70368\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-70368"], "statement": "This Moderate impact vulnerability affects stunnel services if their configuration allows long attacker-controlled log messages. Server-side IMAP protocol negotiation (\"protocol = imap\") is known to be affected, where a remote, unauthenticated attacker can trigger a denial-of-service by sending an oversized IMAP command. Reliable integrity impact or code execution as a result of this issue would be very difficult and likely impractical. This issue specifically affects \"stunnel\" 5.79 and lower when exposed to untrusted networks.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 85.0, "confidence_source": "inferred", "scores": [{"score": 85.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "stunnel", "vendor": "stunnel"}], "created": "2026-08-04T14:00:03.706545+00:00", "updated": "2026-08-04T14:00:03.706585+00:00", "vendors": ["stunnel", "stunnel$PRODUCT$stunnel"]}