CVE-2026-32792

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-32792", "assignerOrgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6", "state": "PUBLISHED", "assignerShortName": "NLnet Labs", "dateReserved": "2026-05-07T10:07:51.839Z", "datePublished": "2026-05-20T09:17:47.920Z", "dateUpdated": "2026-05-20T12:16:06.804Z"}, "containers": {"cna": {"title": "Packet of death with DNSCrypt", "datePublic": "2026-05-20T00:00:00.000Z", "affected": [{"vendor": "NLnet Labs", "product": "Unbound", "versions": [{"version": "1.6.2", "status": "affected", "lessThan": "1.25.1", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "NLnet Labs Unbound 1.6.2 up to and including version 1.25.0 has a denial of service vulnerability when compiled with DNSCrypt support ('--enable-dnscrypt'). A bad DNSCrypt query could underflow Unbound's DNSCrypt packet reading procedure that may lead to heap overflow. A malicious actor can exploit the vulnerability with a single bad DNSCrypt query that its decrypted plaintext consists entirely of '0x00' bytes and does not contain the expected '0x80' marker. Unbound would then start reading more bytes than necessary until it finds a non-'0x00' byte. Based on the underlying memory allocator and the memory layout, it could lead to heap overflow while reading followed by a crash. Likelihood of a crash is low, since it relies heavily on the underlying memory allocator and the memory layout. If the heap overflow does not happen, Unbound's later packet checks will deny the packet. Unbound 1.25.1 contains a patch with a fix to bound reading in the given buffer space."}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "Compiled with DNSCrypt"}], "cvssV4_0": {"version": "4.0", "baseScore": 4.6, "baseSeverity": "MEDIUM", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green"}}], "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-166", "description": "CWE-166: Improper Handling of Missing Special Element", "type": "CWE"}, {"lang": "en", "cweId": "CWE-125", "description": "CWE-125: Out-of-bounds Read", "type": "CWE"}]}], "solutions": [{"lang": "en", "value": "This issue is fixed starting with version 1.25.1"}], "timeline": [{"time": "2026-04-16T00:00:00.000Z", "lang": "en", "value": "Issue reported by Andrew Griffiths"}, {"time": "2026-04-17T00:00:00.000Z", "lang": "en", "value": "NLnet Labs shares patch"}, {"time": "2026-04-18T00:00:00.000Z", "lang": "en", "value": "Andrew Griffiths verifies patch"}, {"time": "2026-05-20T00:00:00.000Z", "lang": "en", "value": "Fixes released with version 1.25.1"}], "credits": [{"lang": "en", "value": "Andrew Griffiths (calif.io)", "type": "finder"}], "references": [{"url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-32792.txt", "tags": ["vendor-advisory"]}], "providerMetadata": {"orgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6", "shortName": "NLnet Labs", "dateUpdated": "2026-05-20T09:17:47.920Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-20T12:15:56.617664Z", "id": "CVE-2026-32792", "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": "2026-05-20T12:16:06.804Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-32792", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-20T12:15:56.617664Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-20T12:16:01.439Z"}}], "cna": {"title": "Packet of death with DNSCrypt", "credits": [{"lang": "en", "type": "finder", "value": "Andrew Griffiths (calif.io)"}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "baseScore": 4.6, "baseSeverity": "MEDIUM", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green"}, "scenarios": [{"lang": "en", "value": "Compiled with DNSCrypt"}]}], "affected": [{"vendor": "NLnet Labs", "product": "Unbound", "versions": [{"status": "affected", "version": "1.6.2", "lessThan": "1.25.1", "versionType": "semver"}], "defaultStatus": "unaffected"}], "timeline": [{"lang": "en", "time": "2026-04-16T00:00:00.000Z", "value": "Issue reported by Andrew Griffiths"}, {"lang": "en", "time": "2026-04-17T00:00:00.000Z", "value": "NLnet Labs shares patch"}, {"lang": "en", "time": "2026-04-18T00:00:00.000Z", "value": "Andrew Griffiths verifies patch"}, {"lang": "en", "time": "2026-05-20T00:00:00.000Z", "value": "Fixes released with version 1.25.1"}], "solutions": [{"lang": "en", "value": "This issue is fixed starting with version 1.25.1"}], "datePublic": "2026-05-20T00:00:00.000Z", "references": [{"url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-32792.txt", "tags": ["vendor-advisory"]}], "x_generator": {"engine": "cvelib 1.8.0"}, "descriptions": [{"lang": "en", "value": "NLnet Labs Unbound 1.6.2 up to and including version 1.25.0 has a denial of service vulnerability when compiled with DNSCrypt support ('--enable-dnscrypt'). A bad DNSCrypt query could underflow Unbound's DNSCrypt packet reading procedure that may lead to heap overflow. A malicious actor can exploit the vulnerability with a single bad DNSCrypt query that its decrypted plaintext consists entirely of '0x00' bytes and does not contain the expected '0x80' marker. Unbound would then start reading more bytes than necessary until it finds a non-'0x00' byte. Based on the underlying memory allocator and the memory layout, it could lead to heap overflow while reading followed by a crash. Likelihood of a crash is low, since it relies heavily on the underlying memory allocator and the memory layout. If the heap overflow does not happen, Unbound's later packet checks will deny the packet. Unbound 1.25.1 contains a patch with a fix to bound reading in the given buffer space."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-166", "description": "CWE-166: Improper Handling of Missing Special Element"}, {"lang": "en", "type": "CWE", "cweId": "CWE-125", "description": "CWE-125: Out-of-bounds Read"}]}], "providerMetadata": {"orgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6", "shortName": "NLnet Labs", "dateUpdated": "2026-05-20T09:17:47.920Z"}}}, "cveMetadata": {"cveId": "CVE-2026-32792", "state": "PUBLISHED", "dateUpdated": "2026-05-20T12:16:06.804Z", "dateReserved": "2026-05-07T10:07:51.839Z", "assignerOrgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6", "datePublished": "2026-05-20T09:17:47.920Z", "assignerShortName": "NLnet Labs"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Unbound", "vendor": "NLnet Labs", "versions": [{"lessThan": "1.25.1", "status": "affected", "version": "1.6.2", "versionType": "semver"}]}], "source": "sep@nlnetlabs.nl"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*", "matchCriteriaId": "E2A7CA69-1A30-44D8-A0FF-2A4853C6F6D9", "versionEndExcluding": "1.25.1", "versionStartIncluding": "1.6.2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "NLnet Labs Unbound 1.6.2 up to and including version 1.25.0 has a denial of service vulnerability when compiled with DNSCrypt support ('--enable-dnscrypt'). A bad DNSCrypt query could underflow Unbound's DNSCrypt packet reading procedure that may lead to heap overflow. A malicious actor can exploit the vulnerability with a single bad DNSCrypt query that its decrypted plaintext consists entirely of '0x00' bytes and does not contain the expected '0x80' marker. Unbound would then start reading more bytes than necessary until it finds a non-'0x00' byte. Based on the underlying memory allocator and the memory layout, it could lead to heap overflow while reading followed by a crash. Likelihood of a crash is low, since it relies heavily on the underlying memory allocator and the memory layout. If the heap overflow does not happen, Unbound's later packet checks will deny the packet. Unbound 1.25.1 contains a patch with a fix to bound reading in the given buffer space."}, {"lang": "es", "value": "NLnet Labs Unbound 1.6.2 hasta e incluyendo la versi\u00f3n 1.25.0 tiene una vulnerabilidad de denegaci\u00f3n de servicio cuando se compila con soporte para DNSCrypt ('--enable-dnscrypt'). Una consulta DNSCrypt incorrecta podr\u00eda causar un underflow en el procedimiento de lectura de paquetes DNSCrypt de Unbound que puede llevar a un desbordamiento de mont\u00edculo. Un actor malicioso puede explotar la vulnerabilidad con una \u00fanica consulta DNSCrypt incorrecta cuyo texto plano descifrado consiste enteramente en bytes '0x00' y no contiene el marcador '0x80' esperado. Unbound entonces comenzar\u00eda a leer m\u00e1s bytes de los necesarios hasta que encuentre un byte que no sea '0x00'. Basado en el asignador de memoria subyacente y la disposici\u00f3n de la memoria, podr\u00eda llevar a un desbordamiento de mont\u00edculo durante la lectura seguido de un fallo. La probabilidad de un fallo es baja, ya que depende en gran medida del asignador de memoria subyacente y de la disposici\u00f3n de la memoria. Si el desbordamiento de mont\u00edculo no ocurre, las comprobaciones posteriores de paquetes de Unbound denegar\u00e1n el paquete. Unbound 1.25.1 contiene un parche con una correcci\u00f3n para limitar la lectura en el espacio de b\u00fafer dado."}], "id": "CVE-2026-32792", "lastModified": "2026-07-24T10:10:00.197", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 4.6, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "UNREPORTED", "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:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/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": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "sep@nlnetlabs.nl", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-32792", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-20T12:15:56.617664Z", "version": "2.0.3"}}]}, "published": "2026-05-20T10:16:26.277", "references": [{"source": "sep@nlnetlabs.nl", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-32792.txt"}], "sourceIdentifier": "sep@nlnetlabs.nl", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-166"}], "source": "sep@nlnetlabs.nl", "type": "Secondary"}]}

{"bugzilla": {"description": "unbound: Packet of death with DNSCrypt", "id": "2479779", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479779"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["A flaw was found in Unbound. A remote attacker can exploit this vulnerability by sending a specially crafted DNSCrypt query. This malicious query, when processed, causes Unbound to read beyond its allocated memory, leading to a heap overflow. This can result in a denial of service (DoS) by crashing the Unbound service."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-32792", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "unbound", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Fix deferred", "package_name": "unbound", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "unbound", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "unbound", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "unbound", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "unbound", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-05-26T03:43:23Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-32792\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-32792"], "statement": "This Moderate impact denial of service vulnerability affects Unbound instances compiled with DNSCrypt support. A specially crafted DNSCrypt query could lead to a heap overflow and service crash. However, the likelihood of a crash is low due to reliance on specific memory layouts and subsequent packet checks that may prevent successful exploitation.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.6.2,1.25.1)"}}], "enrichment": {"confidence": 97.0, "confidence_source": "matching", "scores": [{"score": 97.0, "source": "matching"}]}, "original": {"product": "Unbound", "source": "cna", "vendor": "NLnet Labs"}, "product": "unbound", "vendor": "nlnetlabs"}], "created": "2026-05-20T12:00:12.502282+00:00", "updated": "2026-05-21T08:15:06.075357+00:00", "vendors": ["nlnetlabs", "nlnetlabs$PRODUCT$unbound"]}