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CVE-2026-18355

CVSS 7.5 · YüksekNVD: Awaiting Analysis

Açıklama (NVD)

A heap buffer overflow flaw was found in the SASL I/O layer of 389 Directory Server (389-ds-base). In sasl_io_start_packet(), the wrapped-record length read from the wire is validated only against an upper bound. A small wire length (0, 1, or 2) produces an encrypted_buffer_count below the already-consumed encrypted_buffer_offset, causing an unsigned subtraction underflow in sasl_io_read_packet(). PR_Recv is then requested to read approximately 4 GiB into a 1024-byte heap buffer, resulting in a heap buffer overflow with attacker-controlled content. After a successful SASL bind with integrity protection (SSF > 0), a remote authenticated attacker can cause a denial of service or potentially achieve remote code execution. This flaw is distinct from CVE-2026-11774, whose fix only guards against upper-bound overflow.

Yayın: 07.09.2026 · Son değişiklik: 05.11.2026 · Zayıflık: CWE-191

CVSS 3.1 metrikleri

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Saldırı vektörüAğ (uzaktan)
KarmaşıklıkYüksek
Gereken yetkiDüşük
Kullanıcı etkileşimiGerekmez
KapsamDeğişmez
GizlilikYüksek
BütünlükYüksek
ErişilebilirlikYüksek

Hesaplanan temel puan: 7.5. CVSS hesaplayıcıda incele

Referanslar

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