CVE-2026-21900

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{"affected": [{"affectedData": [{"product": "CryptoLib", "vendor": "nasa", "versions": [{"status": "affected", "version": "< 1.4.3"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:nasa:cryptolib:*:*:*:*:*:*:*:*", "matchCriteriaId": "AE1BE91E-2901-42AF-BC66-762CFA7A2582", "versionEndExcluding": "1.4.3", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "CryptoLib provides a software-only solution using the CCSDS Space Data Link Security Protocol - Extended Procedures (SDLS-EP) to secure communications between a spacecraft running the core Flight System (cFS) and a ground station. Prior to version 1.4.3, an out-of-bounds heap read vulnerability in cryptography_encrypt() occurs when parsing JSON metadata from KMC server responses. The flawed strtok iteration pattern uses ptr + strlen(ptr) + 1 which reads one byte past allocated buffer boundaries when processing short or malformed metadata strings. This issue has been patched in version 1.4.3."}, {"lang": "es", "value": "CryptoLib proporciona una soluci\u00f3n \u00fanicamente de software utilizando el Protocolo de Seguridad de Enlace de Datos Espaciales CCSDS - Procedimientos Extendidos (SDLS-EP) para asegurar las comunicaciones entre una nave espacial que ejecuta el Sistema de Vuelo central (cFS) y una estaci\u00f3n terrestre. Antes de la versi\u00f3n 1.4.3, una vulnerabilidad de lectura de pila fuera de l\u00edmites en cryptography_encrypt() ocurre al analizar metadatos JSON de las respuestas del servidor KMC. El patr\u00f3n de iteraci\u00f3n defectuoso de strtok utiliza ptr + strlen(ptr) + 1, que lee un byte m\u00e1s all\u00e1 de los l\u00edmites del b\u00fafer asignado al procesar cadenas de metadatos cortas o malformadas. Este problema ha sido parcheado en la versi\u00f3n 1.4.3."}], "id": "CVE-2026-21900", "lastModified": "2026-06-17T10:19:07.017", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "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": 8.2, "baseSeverity": "HIGH", "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": "NOT_DEFINED", "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: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:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-21900", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-01-13T17:16:31.457731Z", "version": "2.0.3"}}]}, "published": "2026-01-10T01:16:18.263", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/nasa/CryptoLib/commit/2372efd3da1ccb226b4297222e25f41ecc84821d"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/nasa/CryptoLib/releases/tag/v1.4.3"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/nasa/CryptoLib/security/advisories/GHSA-4g6v-36fv-qcvw"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/nasa/CryptoLib/security/advisories/GHSA-4g6v-36fv-qcvw"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"analysis": {"en": {"generated_at": "2026-04-18T16:35:41.650755+00:00", "value": {"mitigation_remediation": ["Upgrade CryptoLib to version 1.4.3 or later.", "Validate all JSON metadata before passing it to cryptography_encrypt, checking for unexpected length or format.", "If an upgrade cannot be performed immediately, monitor KMC traffic for malformed responses and isolate the CryptoLib process from untrusted KMC inputs to mitigate potential memory disclosure."], "summary": {"action": "Apply Patch", "impact": "Memory Disclosure"}, "threat_synthesis": {"affected_systems": "The affected product is NASA\u2019s CryptoLib, which implements the CCSDS Space Data Link Security Protocol for spacecraft and ground station communication. All releases prior to v1.4.3 are impacted. The patch was released in version 1.4.3 and is available via the official GitHub releases page.", "description_and_impact": "CryptoLib\u2019s cryptography_encrypt function parses JSON metadata received from a KMC server. A flawed iteration using ptr + strlen(ptr) + 1 reads one byte past the buffer boundary for short or malformed strings, leading to an out\u2011of\u2011bounds heap read. This vulnerability is identified as CWE\u2011125 and carries a CVSS score of 8.2. The primary consequence is the potential exposure of sensitive data and possible software instability.", "risk_and_exploitability": "The EPSS score is below 1%, indicating a low probability of exploitation. CryptoLib is not listed in the CISA KEV catalog, and no public exploits are currently known. Successful exploitation would require the attacker to control or influence the KMC server\u2019s response to craft short or malformed metadata, enabling them to trigger the out\u2011of\u2011bounds read and potentially leak memory contents or cause a crash."}}}}, "created": "2026-01-12T14:36:45.879461+00:00", "updated": "2026-04-18T16:45:05.220076+00:00", "vendors": ["nasa", "nasa$PRODUCT$cryptolib"]}