In doProlog in xmlparse.c in Expat (aka libexpat) before 2.4.3, an integer overflow exists for m_groupSize.
Priority HIGH 70CWE-190Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 15 fixed, 4 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-190 and the CVSS impact.
Summary
In doProlog in xmlparse.c in Expat (aka libexpat) before 2.4.3, an integer overflow exists for m_groupSize.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.04465 91st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 6 advisoriesRed Hat: 15 fixed, 4 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 10
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:* | before 2.4.3 | Vulnerable | libexpat project |
| cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:hci_baseboard_management_controller:h610c:*:*:*:*:*:*:* | h610c | Vulnerable | NetApp |
| cpe:2.3:a:netapp:hci_baseboard_management_controller:h610s:*:*:*:*:*:*:* | h610s | Vulnerable | NetApp |
| cpe:2.3:a:netapp:hci_baseboard_management_controller:h615c:*:*:*:*:*:*:* | h615c | Vulnerable | NetApp |
| cpe:2.3:a:netapp:oncommand_workflow_automation:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:solidfire_\&_hci_management_node:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:tenable:nessus:*:*:*:*:*:*:*:* | before 8.15.3; 10.0.0 to before 10.1.1 | Vulnerable | Tenable |
| cpe:2.3:a:siemens:sinema_remote_connect_server:*:*:*:*:*:*:*:* | before 3.1 | Vulnerable | Siemens |
- cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:* Versions before 2.4.3 Vulnerable ·libexpat project
- cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:hci_baseboard_management_controller:h610c:*:*:*:*:*:*:* Versions h610c Vulnerable ·NetApp
- cpe:2.3:a:netapp:hci_baseboard_management_controller:h610s:*:*:*:*:*:*:* Versions h610s Vulnerable ·NetApp
- cpe:2.3:a:netapp:hci_baseboard_management_controller:h615c:*:*:*:*:*:*:* Versions h615c Vulnerable ·NetApp
- cpe:2.3:a:netapp:oncommand_workflow_automation:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:solidfire_\&_hci_management_node:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:tenable:nessus:*:*:*:*:*:*:*:* Versions before 8.15.3; 10.0.0 to before 10.1.1 Vulnerable ·Tenable
- cpe:2.3:a:siemens:sinema_remote_connect_server:*:*:*:*:*:*:*:* Versions before 3.1 Vulnerable ·Siemens
Remediation
Red Hat 6 advisories
- RHSA-2025:22871 Released 2025-12-09 · Red Hat rating Importantexpat security update
- Red Hat Enterprise Linux BaseOS AUS (v. 8.2) expat-2.2.10-1.el8_2
- RHSA-2025:22785 Released 2025-12-04 · Red Hat rating Importantexpat security update
- Red Hat Enterprise Linux BaseOS AUS (v.8.4) expat-2.2.10-1.el8_4
- Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) expat-2.2.10-1.el8_4
- RHSA-2022:7692 Released 2022-11-08 · Red Hat rating Moderatexmlrpc-c security update
- Red Hat CodeReady Linux Builder (v. 8) xmlrpc-c-c++-1.51.0-8.el8, xmlrpc-c-client++-1.51.0-8.el8, xmlrpc-c-devel-1.51.0-8.el8
- Red Hat Enterprise Linux BaseOS (v. 8) xmlrpc-c-1.51.0-8.el8, xmlrpc-c-client-1.51.0-8.el8
Show 3 more Red Hat advisories
- RHSA-2022:7144 Released 2022-10-26 · Red Hat rating ImportantRed Hat JBoss Core Services Apache HTTP Server 2.4.51 security update
- Red Hat JBoss Core Services
- RHSA-2022:1069 Released 2022-03-28 · Red Hat rating Importantexpat security update
- Red Hat Enterprise Linux Client (v. 7) expat-2.1.0-14.el7_9
- Red Hat Enterprise Linux Client Optional (v. 7) expat-devel-2.1.0-14.el7_9, expat-static-2.1.0-14.el7_9
- Red Hat Enterprise Linux ComputeNode Optional (v. 7) expat-devel-2.1.0-14.el7_9, expat-static-2.1.0-14.el7_9
- Red Hat Enterprise Linux Server (v. 7) expat-2.1.0-14.el7_9, expat-2.1.0-14.el7_9.ppc, expat-devel-2.1.0-14.el7_9 +1
- Red Hat Enterprise Linux Server Optional (v. 7) expat-static-2.1.0-14.el7_9, expat-static-2.1.0-14.el7_9.ppc
- Red Hat Enterprise Linux Workstation (v. 7) expat-2.1.0-14.el7_9, expat-devel-2.1.0-14.el7_9
- Red Hat Enterprise Linux Workstation Optional (v. 7) expat-static-2.1.0-14.el7_9
- RHSA-2022:0951 Released 2022-03-16 · Red Hat rating Importantexpat security update
- Red Hat Enterprise Linux BaseOS (v. 8) expat-2.2.5-4.el8_5.3, expat-devel-2.2.5-4.el8_5.3
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix yet |
| Red Hat Enterprise Linux 8 | Affected | No fix yet |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat CodeReady Linux Builder (v. 8) | Fixed | RHSA-2022:7692 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | — |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2022:0951, RHSA-2022:7692 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | — |
| Red Hat Enterprise Linux BaseOS AUS (v. 8.2) | Fixed | RHSA-2025:22871 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.4) | Fixed | RHSA-2025:22785 |
| Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) | Fixed | RHSA-2025:22785 |
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2022:1069 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2022:1069 |
| Red Hat Enterprise Linux ComputeNode Optional (v. 7) | Fixed | RHSA-2022:1069 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2022:1069 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2022:1069 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2022:1069 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2022:1069 |
| Red Hat JBoss Core Services | Fixed | RHSA-2022:7144 |
Not affected: 4 products
- Red Hat Enterprise Linux 9
- Red Hat Enterprise Linux BaseOS AUS (v. 8.2)
- Red Hat Enterprise Linux BaseOS AUS (v.8.4)
- Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
Timeline
- 2026-10-02 Threatist record created from CVE-2021-46143
- 2026-10-03 Alias added: GHSA-j6g2-cvhq-p8xr
- 2026-10-09 Fix available: RHSA-2022:7144 · Red Hat
- 2026-10-16 EPSS moved to the 90th–95th percentile
- 2026-10-16 Fix available: Red Hat JBoss Core Services · Red Hat
References
Patch 3
Sources
- CVE-2021-46143 · CVE Program
- CVE-2021-46143 · NVD
- FIRST EPSS
- GHSA-j6g2-cvhq-p8xr · GitHub Advisory Database · CC BY 4.0
- CVE-2021-46143 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences