CVE-2026-4046

iconv crash due to assertion failure with untrusted input

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

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. This vulnerability can be trivially mitigated by removing the IBM1390 and IBM1399 character sets from systems that do not need them.

La función iconv() en la Biblioteca C de GNU versiones 2.43 y anteriores puede colapsar debido a un fallo de aserción al convertir entradas de los conjuntos de caracteres IBM1390 o IBM1399, lo que puede ser utilizado para colapsar una aplicación de forma remota. Esta vulnerabilidad puede mitigarse trivialmente al eliminar los conjuntos de caracteres IBM1390 e IBM1399 de los sistemas que no los necesiten.

*Credits: Rocket Ma

CVSS Scores

CISAv3.1 7.5

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

Poc

Automatable

Yes

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2026-03-12 CVE Reserved
2026-03-30 CVE Published
2026-04-20 CVE Updated
2026-05-11 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-617: Reachable Assertion

CAPEC

CAPEC-153: Input Data Manipulation

References (3)

URL	Tag	Source
https://sourceware.org/bugzilla/show_bug.cgi?id=33980	Issue Tracking
https://inbox.sourceware.org/libc-announce/76814edf-cf7f-47ec-979d-2dce0a2c76bf@gotplt.org/T/#u	Mailing List

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0007;hb=HEAD	2026-04-01

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
The GNU C Library Search vendor "The GNU C Library"		Glibc Search vendor "The GNU C Library" for product "Glibc"				>= 2.3.3 <= 2.43 Search vendor "The GNU C Library" for product "Glibc" and version " >= 2.3.3 <= 2.43"		en		Affected