CVE-2026-84243 GNU C Library - Command Injection

GNU C Library >= 2.0 contains a command injection caused by unsafe handling of LANGUAGE environment variable in gettext functions, letting attackers load crafted message catalogs to execute arbitrary code, exploit requires attacker to set LANGUAGE and select a non-C locale.

CVSS base score 7.0 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.30% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Command Injection
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
30 October 2026
Updated
1 November 2026
Weakness
CWE-22

Vendor fix

Update to a version that rejects '..' path components in locale names and properly sanitizes LANGUAGE environment variable.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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