CVE-2026-54417

An integer overflow in the mtar_next function in src/microtar.c in rxi microtar 0.1.0 allows a remote attacker to cause a denial of service (uncontrolled CPU consumption / infinite loop) via a crafted tar archive. mtar_next computes the offset to the next record as round_up(h.size, 512) + sizeof(mtar_raw_header_t) using 32-bit arithmetic.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/rxi/microtar
https://github.com/rxi/microtar/blob/master/src/microtar.c#L239
https://raw.githubusercontent.com/rxi/microtar/master/src/microtar.c

Configurations

No configuration.

History

26 Oct 2026, 11:10

Type	Values Removed	Values Added
Summary		(es) Un desbordamiento de entero en la función mtar_next() en src/microtar.c en rxi microtar 0.1.0 permite a un atacante remoto causar una denegación de servicio (consumo incontrolado de CPU / bucle infinito) a través de un archivo tar manipulado. mtar_next() calcula el desplazamiento al siguiente registro como round_up(h.size, 512) + sizeof(mtar_raw_header_t) usando aritmética de 32 bits. Cuando el campo de tamaño de la cabecera es un múltiplo de 512 en el rango 0xFFFFFC01-0xFFFFFE00 (p. ej. 0xFFFFFE00), la adición se ajusta a 0, por lo que mtar_next() busca la posición del registro actual en lugar de avanzar. Como resultado, mtar_find() y cualquier bucle que itere entradas con mtar_next() se repiten indefinidamente sobre el mismo registro, colgando el proceso al 100% de CPU sin recuperación.

Information

Published : 2026-06-17 14:17

Updated : 2026-10-26 11:10

NVD link : CVE-2026-54417

Mitre link : CVE-2026-54417

CVE.ORG link : CVE-2026-54417

JSON object : View

Products Affected

No product.

CWE

CWE-190

Integer Overflow or Wraparound

CWE-835

Loop with Unreachable Exit Condition ('Infinite Loop')

{"id": "CVE-2026-54417", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-54417", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-06-17T15:01:28.255429Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 8.7, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "affectedData": [{"repo": "https://github.com/rxi/microtar", "vendor": "rxi", "product": "microtar", "versions": [{"status": "affected", "version": "0.1.0", "versionType": "semver"}], "programFiles": ["src/microtar.c"], "collectionURL": "https://github.com/rxi/microtar", "defaultStatus": "affected", "programRoutines": [{"name": "mtar_next"}]}]}], "published": "2026-06-17T14:17:58.540", "references": [{"url": "https://github.com/rxi/microtar", "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"}, {"url": "https://github.com/rxi/microtar/blob/master/src/microtar.c#L239", "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"}, {"url": "https://raw.githubusercontent.com/rxi/microtar/master/src/microtar.c", "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "description": [{"lang": "en", "value": "CWE-190"}, {"lang": "en", "value": "CWE-835"}]}], "descriptions": [{"lang": "en", "value": "An integer overflow in the mtar_next function in src/microtar.c in rxi microtar 0.1.0 allows a remote attacker to cause a denial of service (uncontrolled CPU consumption / infinite loop) via a crafted tar archive. mtar_next computes the offset to the next record as round_up(h.size, 512) + sizeof(mtar_raw_header_t) using 32-bit arithmetic."}, {"lang": "es", "value": "Un desbordamiento de entero en la funci\u00f3n mtar_next() en src/microtar.c en rxi microtar 0.1.0 permite a un atacante remoto causar una denegaci\u00f3n de servicio (consumo incontrolado de CPU / bucle infinito) a trav\u00e9s de un archivo tar manipulado. mtar_next() calcula el desplazamiento al siguiente registro como round_up(h.size, 512) + sizeof(mtar_raw_header_t) usando aritm\u00e9tica de 32 bits. Cuando el campo de tama\u00f1o de la cabecera es un m\u00faltiplo de 512 en el rango 0xFFFFFC01-0xFFFFFE00 (p. ej. 0xFFFFFE00), la adici\u00f3n se ajusta a 0, por lo que mtar_next() busca la posici\u00f3n del registro actual en lugar de avanzar. Como resultado, mtar_find() y cualquier bucle que itere entradas con mtar_next() se repiten indefinidamente sobre el mismo registro, colgando el proceso al 100% de CPU sin recuperaci\u00f3n."}], "lastModified": "2026-10-26T11:10:00.157", "sourceIdentifier": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"}