CVE-2021-43396 Affecting glibc-langpack-iu package, versions <0:2.34-181.amzn2023.0.1


Severity

Recommended
medium

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.11% (30th percentile)

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  • Snyk IDSNYK-AMZN2023-GLIBCLANGPACKIU-10294210
  • published3 Jun 2025
  • disclosed4 Nov 2021

Introduced: 4 Nov 2021

CVE-2021-43396  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 glibc-langpack-iu to version 0:2.34-181.amzn2023.0.1 or higher.
This issue was patched in ALAS2023-2025-988.

NVD Description

Note: Versions mentioned in the description apply only to the upstream glibc-langpack-iu package and not the glibc-langpack-iu package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

In iconvdata/iso-2022-jp-3.c in the GNU C Library (aka glibc) 2.34, remote attackers can force iconv() to emit a spurious '\0' character via crafted ISO-2022-JP-3 data that is accompanied by an internal state reset. This may affect data integrity in certain iconv() use cases. NOTE: the vendor states "the bug cannot be invoked through user input and requires iconv to be invoked with a NULL inbuf, which ought to require a separate application bug to do so unintentionally. Hence there's no security impact to the bug.

CVSS Base Scores

version 3.1