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CVE-2026-32829

Estado: ModificadaAlta (8.2)—

lz4_flex is a pure Rust implementation of LZ4 compression/decompression. In versions 0.11.5 and below, and 0.12.0, decompressing invalid LZ4 data can leak sensitive information from uninitialized memory or from previous decompression operations. The library fails to properly validate offset values during LZ4 "match copy operations," allowing out-of-bounds reads from the output buffer. The block-based API functions (`decompress_into`, `decompress_into_with_dict`, and others when `safe-decode` is disabled) are affected, while all frame APIs are unaffected. The impact is potential exposure of sensitive data and secrets through crafted or malformed LZ4 input. This issue has been fixed in versions 0.11.6 and 0.12.1.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad de lectura fuera de límites (CWE-201, CWE-823) en biblioteca LZ4 expuesta en red; el atacante envía datos LZ4 malformados para extraer información sensible de memoria no inicializada o anterior.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account ManagementLimit Access to Resource Over NetworkFilter Network TrafficUpdate SoftwareActive Directory ConfigurationVulnerability Scanning

Tecnologías afectadas (1)

Pseitz — LZ4 Flex

CWE

Referencias

JSON original (NVD)

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      "value": "lz4_flex is a pure Rust implementation of LZ4 compression/decompression. In versions 0.11.5 and below, and 0.12.0,  decompressing invalid LZ4 data can leak sensitive information from uninitialized memory or from previous decompression operations. The library fails to properly validate offset values during LZ4 \"match copy operations,\" allowing out-of-bounds reads from the output buffer. The block-based API functions (`decompress_into`, `decompress_into_with_dict`, and others when `safe-decode` is disabled) are affected, while all frame APIs are unaffected. The impact is potential exposure of sensitive data and secrets through crafted or malformed LZ4 input. This issue has been fixed in versions 0.11.6 and 0.12.1."
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      "lang": "es",
      "value": "lz4_flex es una implementación pura en Rust de compresión/descompresión LZ4. En las versiones 0.11.5 e inferiores, y 0.12.0, la descompresión de datos LZ4 no válidos puede filtrar información sensible de memoria no inicializada o de operaciones de descompresión anteriores. La biblioteca no valida correctamente los valores de desplazamiento durante las 'operaciones de copia de coincidencia' de LZ4, permitiendo lecturas fuera de límites del búfer de salida. Las funciones API basadas en bloques ('decompress_into', 'decompress_into_with_dict', y otras cuando 'safe-decode' está deshabilitado) se ven afectadas, mientras que todas las API de trama no se ven afectadas. El impacto es la exposición potencial de datos sensibles y secretos a través de entradas LZ4 manipuladas o malformadas. Este problema ha sido solucionado en las versiones 0.11.6 y 0.12.1."
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  "lastModified": "2026-09-17T12:17:49.007",
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