xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert…
Priority HIGH 75CWE-668Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 21 fixed, 1 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat.
Summary
xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator characters into namespace URIs.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.35271 98th percentileScored 2026-11-07
Fix Partial Red Hat: 20 advisoriesRed Hat: 21 fixed, 1 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- 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 · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:* | before 2.4.5 | 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:a:oracle:http_server:12.2.1.3.0:*:*:*:*:*:*:* | 12.2.1.3.0 | Vulnerable | Oracle |
| cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:* | 12.2.1.4.0 | Vulnerable | Oracle |
| cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:* | 8.8 | Vulnerable | Oracle |
| cpe:2.3:a:siemens:sinema_remote_connect_server:*:*:*:*:*:*:*:* | before 3.1 | Vulnerable | Siemens |
- cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:* Versions before 2.4.5 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:a:oracle:http_server:12.2.1.3.0:*:*:*:*:*:*:* Versions 12.2.1.3.0 Vulnerable ·Oracle
- cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:* Versions 12.2.1.4.0 Vulnerable ·Oracle
- cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:* Versions 8.8 Vulnerable ·Oracle
- cpe:2.3:a:siemens:sinema_remote_connect_server:*:*:*:*:*:*:*:* Versions before 3.1 Vulnerable ·Siemens
Remediation
Red Hat 20 advisories
- RHSA-2022:7811 Released 2022-11-08 · Red Hat rating Importantmingw-expat security update
- Red Hat CodeReady Linux Builder (v. 8) mingw-expat-2.4.8-1.el8, mingw32-expat-2.4.8-1.el8, mingw64-expat-2.4.8-1.el8
- 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-2022:1309 Released 2022-04-12 · Red Hat rating Importantexpat security update
- Red Hat Enterprise Linux Server (v. 6 ELS) expat-2.0.1-14.el6_10, expat-devel-2.0.1-14.el6_10
Show 17 more Red Hat advisories
- RHSA-2022:1263 Released 2022-04-07 · Red Hat rating ImportantRHV-H security update (redhat-virtualization-host) 4.3.22
- RHEL 7-based RHEV-H for RHEV 4 (build requirements) redhat-virtualization-host-4.3.22-20220330.1.el7_9, redhat-virtualization-host-image-update-4.3.22-20220330.1.el7_9
- Red Hat Virtualization 4 Hypervisor for RHEL 7 redhat-virtualization-host-4.3.22-20220330.1.el7_9, redhat-virtualization-host-image-update-4.3.22-20220330.1.el7_9
- 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-2022:1070 Released 2022-03-28 · Red Hat rating Importantexpat security update
- Red Hat Enterprise Linux BaseOS EUS (v. 8.2) expat-2.2.5-3.el8_2.2, expat-devel-2.2.5-3.el8_2.2
- RHSA-2022:1068 Released 2022-03-28 · Red Hat rating Importantexpat security update
- Red Hat Enterprise Linux BaseOS E4S (v. 8.1) expat-2.2.5-3.el8_1.1, expat-devel-2.2.5-3.el8_1.1
- RHSA-2022:1053 Released 2022-03-24 · Red Hat rating ImportantRed Hat Virtualization Host security and enhancement update [ovirt-4.4.10] Async #2
- Red Hat Virtualization 4 Hypervisor for RHEL 8 redhat-virtualization-host-4.4.10-202203211649_8.5, redhat-virtualization-host-image-update-4.4.10-202203211649_8.5
- RHSA-2022:1012 Released 2022-03-22 · Red Hat rating Importantexpat security update
- Red Hat Enterprise Linux BaseOS EUS (v.8.4) expat-2.2.5-4.el8_4.2, expat-devel-2.2.5-4.el8_4.2
- 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
- RHSA-2022:0850 Released 2022-03-14 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux Client (v. 7) thunderbird-91.7.0-2.el7_9
- Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-91.7.0-2.el7_9
- Red Hat Enterprise Linux Workstation (v. 7) thunderbird-91.7.0-2.el7_9
- RHSA-2022:0853 Released 2022-03-14 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux AppStream EUS (v.8.4) thunderbird-91.7.0-2.el8_4
- RHSA-2022:0845 Released 2022-03-14 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux AppStream (v. 8) thunderbird-91.7.0-2.el8_5
- RHSA-2022:0847 Released 2022-03-14 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux AppStream E4S (v. 8.1) thunderbird-91.7.0-2.el8_1
- RHSA-2022:0843 Released 2022-03-14 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux AppStream EUS (v. 8.2) thunderbird-91.7.0-2.el8_2
- RHSA-2022:0824 Released 2022-03-10 · Red Hat rating Criticalfirefox security and bug fix update
- Red Hat Enterprise Linux Client (v. 7) firefox-91.7.0-3.el7_9
- Red Hat Enterprise Linux Client Optional (v. 7) firefox-91.7.0-3.el7_9
- Red Hat Enterprise Linux Server (v. 7) firefox-91.7.0-3.el7_9
- Red Hat Enterprise Linux Server Optional (v. 7) firefox-91.7.0-3.el7_9
- Red Hat Enterprise Linux Workstation (v. 7) firefox-91.7.0-3.el7_9
- Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-91.7.0-3.el7_9
- RHSA-2022:0817 Released 2022-03-10 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux AppStream EUS (v.8.4) firefox-91.7.0-3.el8_4
- RHSA-2022:0818 Released 2022-03-10 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux AppStream (v. 8) firefox-91.7.0-3.el8_5
- RHSA-2022:0816 Released 2022-03-10 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux AppStream EUS (v. 8.2) firefox-91.7.0-3.el8_2
- RHSA-2022:0815 Released 2022-03-10 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox-91.7.0-3.el8_1
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 8 | Affected | No fix yet |
| RHEL 7-based RHEV-H for RHEV 4 (build requirements) | Fixed | RHSA-2022:1263 |
| Red Hat CodeReady Linux Builder (v. 8) | Fixed | RHSA-2022:7811 |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2022:0818, RHSA-2022:0845 |
| Red Hat Enterprise Linux AppStream E4S (v. 8.1) | Fixed | RHSA-2022:0815, RHSA-2022:0847 |
| Red Hat Enterprise Linux AppStream EUS (v. 8.2) | Fixed | RHSA-2022:0816, RHSA-2022:0843 |
| Red Hat Enterprise Linux AppStream EUS (v.8.4) | Fixed | RHSA-2022:0817, RHSA-2022:0853 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2022:0951 |
| Red Hat Enterprise Linux BaseOS E4S (v. 8.1) | Fixed | RHSA-2022:1068 |
| Red Hat Enterprise Linux BaseOS EUS (v. 8.2) | Fixed | RHSA-2022:1070 |
| Red Hat Enterprise Linux BaseOS EUS (v.8.4) | Fixed | RHSA-2022:1012 |
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2022:0824, RHSA-2022:0850, RHSA-2022:1069 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2022:0824, RHSA-2022:1069 |
| Red Hat Enterprise Linux ComputeNode Optional (v. 7) | Fixed | RHSA-2022:1069 |
| Red Hat Enterprise Linux Server (v. 6 ELS) | Fixed | RHSA-2022:1309 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2022:0824, RHSA-2022:1069 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2022:0824, RHSA-2022:0850, RHSA-2022:1069 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2022:0824, RHSA-2022:0850, RHSA-2022:1069 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2022:0824, RHSA-2022:1069 |
| Red Hat JBoss Core Services | Fixed | RHSA-2022:7144 |
| Red Hat Virtualization 4 Hypervisor for RHEL 7 | Fixed | RHSA-2022:1263 |
| Red Hat Virtualization 4 Hypervisor for RHEL 8 | Fixed | RHSA-2022:1053 |
Not affected: 5 products
- RHEL 7-based RHEV-H for RHEV 4 (build requirements)
- RHEL 8-based RHEV-H for RHEV 4 (build requirements)
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat Virtualization 4 Hypervisor for RHEL 8
Timeline
- 2026-10-02 Threatist record created from CVE-2022-25236
- 2026-10-03 Alias added: GHSA-3c6c-gjpg-qq92
- 2026-10-09 Fix available: RHSA-2022:7144 · Red Hat
- 2026-10-09 Fix available: Red Hat JBoss Core Services · Red Hat
References
Patch 2
Advisory 9
- [oss-security] 20220219 Expat 2.4.5 released, includes 5 security fixes
- DSA-5085
- FEDORA-2022-04f206996b
- FEDORA-2022-3d9d67f558
- [debian-lts-announce] 20220307 [SECURITY] [DLA 2935-1] expat security update
- https://security.netapp.com/advisory/ntap-20220303-0008/
- http://packetstormsecurity.com/files/167238/Zoom-XMPP-Stanza-Smuggling-Remote-Code-Execution.html
- https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf
- GLSA-202209-24
Sources
- CVE-2022-25236 · CVE Program
- CVE-2022-25236 · NVD
- FIRST EPSS
- GHSA-3c6c-gjpg-qq92 · GitHub Advisory Database · CC BY 4.0
- CVE-2022-25236 · Red Hat security data · CC BY 4.0
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