Integer Underflow Affecting lib389 package, versions <2.8.2~git10.030ada7a6-150700.3.25.1


Severity

Recommended
0.0
high
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.84% (56th percentile)

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  • Snyk IDSNYK-SLES157-LIB389-20251034
  • published29 Sept 2026
  • disclosed28 Sept 2026

Introduced: 28 Sep 2026

NewCVE-2026-18355  (opens in a new tab)
CWE-191  (opens in a new tab)

How to fix?

Upgrade SLES:15.7 lib389 to version 2.8.2~git10.030ada7a6-150700.3.25.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream lib389 package and not the lib389 package as distributed by SLES. See How to fix? for SLES:15.7 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1