CVE-2026-6477
Estado: ModificadaAlta (8.8)—
Use of inherently dangerous function PQfn(..., result_is_int=0, ...) in PostgreSQL libpq lo_export(), lo_read(), lo_lseek64(), and lo_tell64() functions allows the server superuser to overwrite a client stack buffer with an arbitrarily-large response. Like gets(), PQfn(..., result_is_int=0, ...) stores arbitrary-length, server-determined data into a buffer of unspecified size. Because both the \lo_export command in psql and pg_dump call lo_read(), the server superuser can overwrite pg_dump or psql stack memory. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Puntuación base: 8.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.45%
- Percentil entre todas las CVEs puntuadas: 37
- Fecha de la puntuación: 6/10/2026
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.
- Explotación
T1203Exploitation for Client Executionexecution85 % - Impacto principal
T1059Command and Scripting Interpreterexecution80 % - Impacto secundario
T1068Exploitation for Privilege Escalationprivilege escalation70 %
Vector CVSS con UI:R (interacción del usuario abriendo comando \lo_export o pg_dump) indica T1203. Buffer overflow permite ejecución de código arbitrario (T1059) e implícitamente escalada si el superuser es comprometido (T1068).
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
Tecnologías afectadas (1)
CWE
- CWE-242
- CWE-120
Referencias
- https://www.postgresql.org/support/security/CVE-2026-6477/
- https://access.redhat.com/errata/RHSA-2026:21182
- https://access.redhat.com/errata/RHSA-2026:22878
- https://access.redhat.com/errata/RHSA-2026:26181
- https://access.redhat.com/errata/RHSA-2026:26203
- https://access.redhat.com/errata/RHSA-2026:26204
- https://access.redhat.com/errata/RHSA-2026:26524
- https://access.redhat.com/errata/RHSA-2026:26525
- https://access.redhat.com/errata/RHSA-2026:26561
- https://access.redhat.com/errata/RHSA-2026:27718
- https://access.redhat.com/errata/RHSA-2026:27738
- https://access.redhat.com/errata/RHSA-2026:27741
- https://access.redhat.com/errata/RHSA-2026:27742
- https://access.redhat.com/errata/RHSA-2026:27743
- https://access.redhat.com/errata/RHSA-2026:28037
- https://access.redhat.com/errata/RHSA-2026:28143
- https://access.redhat.com/errata/RHSA-2026:28208
- https://access.redhat.com/errata/RHSA-2026:28999
- https://access.redhat.com/errata/RHSA-2026:29212
- https://access.redhat.com/errata/RHSA-2026:29815
- https://access.redhat.com/errata/RHSA-2026:29904
- https://access.redhat.com/errata/RHSA-2026:29953
- https://access.redhat.com/errata/RHSA-2026:32983
- https://access.redhat.com/errata/RHSA-2026:32994
- https://access.redhat.com/errata/RHSA-2026:33441
- https://access.redhat.com/errata/RHSA-2026:33497
- https://access.redhat.com/errata/RHSA-2026:34043
- https://access.redhat.com/errata/RHSA-2026:34362
- https://access.redhat.com/errata/RHSA-2026:34363
- https://access.redhat.com/errata/RHSA-2026:35880
- https://access.redhat.com/errata/RHSA-2026:42555
- https://access.redhat.com/errata/RHSA-2026:44308
- https://access.redhat.com/errata/RHSA-2026:44391
- https://access.redhat.com/errata/RHSA-2026:44420
- https://access.redhat.com/errata/RHSA-2026:44481
- https://access.redhat.com/errata/RHSA-2026:47090
- https://access.redhat.com/errata/RHSA-2026:49521
- https://access.redhat.com/errata/RHSA-2026:49908
- https://access.redhat.com/errata/RHSA-2026:49909
- https://access.redhat.com/errata/RHSA-2026:50779
- https://access.redhat.com/errata/RHSA-2026:50863
- https://access.redhat.com/errata/RHSA-2026:54760
- https://access.redhat.com/errata/RHSA-2026:58981
- https://access.redhat.com/security/cve/CVE-2026-6477
- https://bugzilla.redhat.com/show_bug.cgi?id=2477442
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6477.json
JSON original (NVD)
Mostrar
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