CVE-2026-4046 | iconv crash due to assertion failure with untrusted input

Exp

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.

Published: 2026-03-30 Last update: 2026-04-20 Assigner: 3ff69d7a-14f2-4f67-a097-88dee7810d18 Source: 3ff69d7a-14f2-4f67-a097-88dee7810d18
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-4046 is rated Exploit Available (52/100): CVSS High severity, with low exploitation likelihood (EPSS 0.07%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2026-4046

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2026-4046

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-11 0.05% 0.07% +0.02%
2 2026-04-08 0.05% 0.05% -0.01%
3 2026-04-05 — 0.05% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-4046

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2026-4046

GitHub Security Advisory for CVE-2026-4046

GHSA-g7c4-wv7q-gcc6 · Severity: high — The iconv() function in the GNU C Library versions 2.43 and earlier may crash due to an assertion...

OS Trackers for CVE-2026-4046

vendor priority summary link
debian not yet assigned CVE-2026-4046 not yet assigned priority: Debian including 1 source packages (glibc), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2026-4046
redhat medium — https://access.redhat.com/security/cve/CVE-2026-4046
suse high CVE-2026-4046 severity important: SUSE including 18 source package names (cross-aarch64-linux-glibc-devel, cross-arm-linux-glibc-devel, …), 50 product×package rows across 31 product lines (SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS, SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS, … (31 product lines)): Known Not Affected 46, First Fixed 4. https://www.suse.com/security/cve/CVE-2026-4046/
ubuntu medium CVE-2026-4046 medium priority: Ubuntu including 2 source packages (eglibc, glibc), 12 status rows across 8 suites (bionic, focal, jammy, noble, questing, trusty, upstream, xenial): needs-triage 9, DNE 3. https://ubuntu.com/security/CVE-2026-4046

Affected software / configurations for CVE-2026-4046

Vendor Product Version Raw CPE
gnu glibc <= 2.43 cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*

References for CVE-2026-4046

cvelogic Threat Intelligence