In libexpat through 2.4.9, there is a use-after free caused by overeager destruction of a…
Priority MEDIUM 45CWE-416Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 15 fixed, 4 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.
Summary
In libexpat through 2.4.9, there is a use-after free caused by overeager destruction of a shared DTD in XML_ExternalEntityParserCreate in out-of-memory situations.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.03182 88th percentileScored 2026-11-07
Public exploit Yes 3 exploit referencesTagged by NVD
Fix Partial Red Hat: 11 advisoriesRed Hat: 15 fixed, 4 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
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 · 21
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:* | up to 2.4.9 | Vulnerable | libexpat project |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | 11.0 | Vulnerable | Debian |
| cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* | 35 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:* | 36 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* | 37 | Vulnerable | Fedoraproject |
| cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:h:netapp:h300s:-:*:*:*:*:*:*:* | not specified by NVD | Running on | NetApp |
| cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:h:netapp:h500s:-:*:*:*:*:*:*:* | not specified by NVD | Running on | NetApp |
- cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:* Versions up to 2.4.9 Vulnerable ·libexpat project
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
- cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* Versions 35 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:* Versions 36 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* Versions 37 Vulnerable ·Fedoraproject
- cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:h:netapp:h300s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
- cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:h:netapp:h500s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
Show 11 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:h:netapp:h700s:-:*:*:*:*:*:*:* | not specified by NVD | Running on | NetApp |
| cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:h:netapp:h410s:-:*:*:*:*:*:*:* | not specified by NVD | Running on | NetApp |
| cpe:2.3:o:netapp:h410c_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:h:netapp:h410c:-:*:*:*:*:*:*:* | not specified by NVD | Running on | NetApp |
| cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:* | not specified by NVD | 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:o:netapp:hci_compute_node_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:h:netapp:hci_compute_node:-:*:*:*:*:*:*:* | not specified by NVD | Running on | NetApp |
- cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:h:netapp:h700s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
- cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:h:netapp:h410s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
- cpe:2.3:o:netapp:h410c_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:h:netapp:h410c:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
- cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:* Versions not specified by NVD 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:o:netapp:hci_compute_node_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:h:netapp:hci_compute_node:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
Remediation
Red Hat 11 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-2024:0421 Released 2024-01-25 · Red Hat rating Moderateexpat security update
- Red Hat Enterprise Linux BaseOS EUS (v.8.6) expat-2.2.5-8.el8_6.4, expat-devel-2.2.5-8.el8_6.4
Show 8 more Red Hat advisories
- RHSA-2023:3355 Released 2023-06-05 · Red Hat rating ImportantRed Hat JBoss Core Services Apache HTTP Server 2.4.51 SP2 security update
- JBCS httpd 2.4.51.sp2
- RHSA-2023:0337 Released 2023-01-23 · Red Hat rating Moderateexpat security update
- Red Hat Enterprise Linux AppStream (v. 9) expat-devel-2.4.9-1.el9_1.1
- Red Hat Enterprise Linux BaseOS (v. 9) expat-2.4.9-1.el9_1.1
- RHSA-2023:0103 Released 2023-01-12 · Red Hat rating Moderateexpat security update
- Red Hat Enterprise Linux BaseOS (v. 8) expat-2.2.5-10.el8_7.1, expat-devel-2.2.5-10.el8_7.1
- RHSA-2022:8554 Released 2022-11-21 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux AppStream (v. 8) firefox-102.5.0-1.el8_7
- RHSA-2022:8553 Released 2022-11-21 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox-102.5.0-1.el8_1
- RHSA-2022:8549 Released 2022-11-21 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux AppStream EUS (v.8.4) firefox-102.5.0-1.el8_4
- RHSA-2022:8550 Released 2022-11-21 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox-102.5.0-1.el8_2
- Red Hat Enterprise Linux AppStream E4S (v. 8.2) firefox-102.5.0-1.el8_2
- Red Hat Enterprise Linux AppStream TUS (v. 8.2) firefox-102.5.0-1.el8_2
- RHSA-2022:8548 Released 2022-11-21 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux AppStream EUS (v.8.6) firefox-102.5.0-1.el8_6
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 |
| JBCS httpd 2.4.51.sp2 | Fixed | RHSA-2023:3355 |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2022:8554 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2023:0337 |
| Red Hat Enterprise Linux AppStream AUS (v. 8.2) | Fixed | RHSA-2022:8550 |
| Red Hat Enterprise Linux AppStream E4S (v. 8.1) | Fixed | RHSA-2022:8553 |
| Red Hat Enterprise Linux AppStream E4S (v. 8.2) | Fixed | RHSA-2022:8550 |
| Red Hat Enterprise Linux AppStream EUS (v.8.4) | Fixed | RHSA-2022:8549 |
| Red Hat Enterprise Linux AppStream EUS (v.8.6) | Fixed | RHSA-2022:8548 |
| Red Hat Enterprise Linux AppStream TUS (v. 8.2) | Fixed | RHSA-2022:8550 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2023:0103 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2023:0337 |
| 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 (v.8.6) | Fixed | RHSA-2024:0421 |
| Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) | Fixed | RHSA-2025:22785 |
Not affected: 4 products
- Red Hat Enterprise Linux 8
- 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-2022-43680
- 2026-10-03 Alias added: GHSA-4hjv-8mmr-jxwv
- 2026-10-09 Fix available: RHSA-2023:3355 · Red Hat
- 2026-10-16 Fix available: JBCS httpd 2.4.51.sp2 · Red Hat
References
Exploit 3
Advisory 12
- [debian-lts-announce] 20221028 [SECURITY] [DLA 3165-1] expat security update
- DSA-5266
- GLSA-202210-38
- FEDORA-2022-ae2559a8f4
- FEDORA-2022-3cf0e7ebc7
- FEDORA-2022-f3a939e960
- FEDORA-2022-5f1e2e9016
- FEDORA-2022-49db80f821
- FEDORA-2022-c43235716e
- https://security.netapp.com/advisory/ntap-20221118-0007/
- [oss-security] 20231228 CVE-2022-43680: Apache OpenOffice: "Use after free" fixed in libexpat
- [oss-security] 20240103 CVE-2022-43680: Apache OpenOffice: "Use after free" fixed in libexpat
Sources
- CVE-2022-43680 · CVE Program
- CVE-2022-43680 · NVD
- FIRST EPSS
- GHSA-4hjv-8mmr-jxwv · GitHub Advisory Database · CC BY 4.0
- CVE-2022-43680 · 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