CVE-2026-5928 Affecting glibc-locale-base package, versions <2.40-160000.5.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.05% (16th percentile)

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  • Snyk IDSNYK-SLES1600-GLIBCLOCALEBASE-16962136
  • published28 May 2026
  • disclosed18 May 2026

Introduced: 18 May 2026

NewCVE-2026-5928  (opens in a new tab)

How to fix?

Upgrade SLES:16.0.0 glibc-locale-base to version 2.40-160000.5.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream glibc-locale-base package and not the glibc-locale-base package as distributed by SLES. See How to fix? for SLES:16.0.0 relevant fixed versions and status.

Calling the ungetwc function on a FILE stream with wide characters encoded in a character set that has overlaps between its single byte and multi-byte character encodings, in the GNU C Library version 2.43 or earlier, may result in an attempt to read bytes before an allocated buffer, potentially resulting in unintentional disclosure of neighboring data in the heap, or a program crash.

A bug in the wide character pushback implementation (_IO_wdefault_pbackfail in libio/wgenops.c) causes ungetwc() to operate on the regular character buffer (fp->_IO_read_ptr) instead of the actual wide-stream read pointer (fp->_wide_data->_IO_read_ptr). The program crash may happen in cases where fp->_IO_read_ptr is not initialized and hence points to NULL. The buffer under-read requires a special situation where the input character encoding is such that there are overlaps between single byte representations and multibyte representations in that encoding, resulting in spurious matches. The spurious match case is not possible in the standard Unicode character sets.

CVSS Base Scores

version 3.1