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EulerOS 2.0 SP15 : glibc (EulerOS-SA-2026-2483)

critical Nessus Plugin ID 323210

Synopsis

The remote EulerOS host is missing multiple security updates.

Description

According to the versions of the glibc packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

 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._x000D_
 _x000D_ 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.(CVE-2026-5928)

 Calling the scanf family of functions with a %mc (malloc'd character match) in the GNU C Library version 2.7 to version 2.43 with a format width specifier with an explicit width greater than 1024 could result in a one byte heap buffer overflow.(CVE-2026-5450)

 The iconv() function in the GNU C Library versions 2.43 and earlier may crash due to an assertion failure when converting inputs from the IBM1390 or IBM1399 character sets, which may be used to remotely crash an application._x000D_
 _x000D_
 _x000D_
 _x000D_ This vulnerability can be trivially mitigated by removing the IBM1390 and IBM1399 character sets from systems that do not need them.(CVE-2026-4046)

 Calling gethostbyaddr or gethostbyaddr_r with a configured nsswitch.conf that specifies the library's DNS backend in the GNU C Library version 2.34 to version 2.43 could, with a crafted response from the configured DNS server, result in a violation of the DNS specification that causes the application to treat a non-answer section of the DNS response as a valid answer.(CVE-2026-4437)

 Calling gethostbyaddr or gethostbyaddr_r with a configured nsswitch.conf that specifies the library's DNS backend in the GNU C library version 2.34 to version 2.43 could result in an invalid DNS hostname being returned to the caller in violation of the DNS specification.(CVE-2026-4438)

Tenable has extracted the preceding description block directly from the EulerOS glibc security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected glibc packages.

See Also

http://www.nessus.org/u?93931685

Plugin Details

Severity: Critical

ID: 323210

File Name: EulerOS_SA-2026-2483.nasl

Version: 1.1

Type: Local

Published: 6/27/2026

Updated: 6/27/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-5450

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:huawei:euleros:glibc-locale-archive, p-cpe:/a:huawei:euleros:glibc-help, p-cpe:/a:huawei:euleros:glibc, p-cpe:/a:huawei:euleros:libnsl, p-cpe:/a:huawei:euleros:nscd, p-cpe:/a:huawei:euleros:glibc-common, p-cpe:/a:huawei:euleros:glibc-locale-source, p-cpe:/a:huawei:euleros:glibc-devel, p-cpe:/a:huawei:euleros:glibc-debugutils, cpe:/o:huawei:euleros:2.0, p-cpe:/a:huawei:euleros:glibc-all-langpacks

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/EulerOS/release, Host/EulerOS/rpm-list, Host/EulerOS/sp

Excluded KB Items: Host/EulerOS/uvp_version

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/26/2026

Vulnerability Publication Date: 3/20/2026

Reference Information

CVE: CVE-2026-4046, CVE-2026-4437, CVE-2026-4438, CVE-2026-5450, CVE-2026-5928