CVE-2026-4046Network attack vector

Application crash via lost iconv conversion state

Published Mar 30, 2026 · Updated Mar 30, 2026

Reachable assertion in GNU Project glibc 2.3.3 through 2.43 allows remote attackers to crash applications during iconv conversion. The IBM1390 and IBM1399 paths in ibm1364.c restart conversion instead of retaining a pending character when output ends between two UCS-4 code points, reaching an assertion. Exploitation requires an application to convert attacker-controlled data with either codec at that buffer boundary; the bounded consequence is termination of that application.

CVSS severity7.5
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in GNU Project glibc 2.3.3 through 2.43 allows remote attackers to crash applications during iconv conversion. The IBM1390 and IBM1399 paths in ibm1364.c restart conversion instead of retaining a pending character when output ends between two UCS-4 code points, reaching an assertion. Exploitation requires an application to convert attacker-controlled data with either codec at that buffer boundary; the bounded consequence is termination of that application.

The record

CVE
CVE-2026-4046
Published
Mar 30, 2026
Updated
Mar 30, 2026
Vendor
The GnuPG Project
Product
glibc
Classifications
CWE-617, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.3.3 <*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The GnuPG Project · glibcversion=2.3.3 <*

Published CVSS scores

5.3Oracle LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5SUSECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7SUSECVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5CISACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5Canonical UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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