CVE-2022-40303

An issue was discovered in libxml2 before 2.10.3. When parsing a multi-gigabyte XML document with the XML_PARSE_HUGE parser option enabled, several integer counters can overflow. This results in an attempt to access an array at a negative 2GB offset, typically leading to a segmentation fault.

Published: 2022-11-23 Last update: 2025-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2022-40303 is rated High Risk (69.1/100): CVSS High severity, with high exploitation likelihood (EPSS 24.21%, 98th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +24.03% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2022-40303

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 2026-06-15 0.18% 24.21% +24.03%
2 2026-02-22 0.15% 0.18% +0.03%
3 2025-12-24 — 0.15% —

Full EPSS history (20 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-40303

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 [email protected]
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-2022-40303

OS Trackers for CVE-2022-40303

vendor priority summary link
alpine — CVE-2022-40303: 2 source package rows (libxml2, libxml2.13); 68 state rows across 7 repos (3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 8, open 60. https://security.alpinelinux.org/vuln/CVE-2022-40303
debian not yet assigned CVE-2022-40303 not yet assigned priority: Debian including 1 source packages (libxml2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2022-40303
gentoo high CVE-2022-40303: 1 GLSA(s) (202210-39), 1 atom(s) (dev-libs/libxml2); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2022-40303
redhat medium — https://access.redhat.com/security/cve/CVE-2022-40303
suse high CVE-2022-40303 severity important: SUSE including 391 source package names (0.23.0.3.2.368:libxml2-2-2.9.7-150000.3.51.1, 1.1.0-build4.19.12:libxml2-2-2.9.7-150000.3.51.1, …), 856 product×package rows across 262 product lines (Container bci/bci-init, Container bci/dotnet-aspnet, … (262 product lines)): Fixed 721, Known Affected 110, Known Not Affected 25. https://www.suse.com/security/cve/CVE-2022-40303/
ubuntu medium CVE-2022-40303 medium priority: Ubuntu including 1 source packages (libxml2), 8 status rows across 8 suites (bionic, focal, jammy, kinetic, lunar, trusty, upstream, xenial): released 7, not-affected 1. https://ubuntu.com/security/CVE-2022-40303

Affected software / configurations for CVE-2022-40303

Vendor Product Version Raw CPE
xmlsoft libxml2 < 2.10.3 cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*
netapp active_iq_unified_manager — cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vsphere:*:*
netapp clustered_data_ontap — cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:*
netapp clustered_data_ontap_antivirus_connector — cpe:2.3:a:netapp:clustered_data_ontap_antivirus_connector:-:*:*:*:*:*:*:*
netapp netapp_manageability_sdk — cpe:2.3:a:netapp:netapp_manageability_sdk:-:*:*:*:*:*:*:*
netapp ontap_select_deploy_administration_utility — cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*
netapp snapmanager — cpe:2.3:a:netapp:snapmanager:-:*:*:*:*:hyper-v:*:*
apple ipados < 15.7.2 cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
apple iphone_os < 15.7.2 cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
apple macos >= 11.0, < 11.7.2 cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*
apple macos >= 12.0, < 12.6.2 cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*
apple tvos < 16.2 cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*
apple watchos < 9.2 cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*
netapp h300s_firmware — cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:*
netapp h500s_firmware — cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:*
netapp h700s_firmware — cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:*
netapp h410s_firmware — cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:*
netapp h410c_firmware — cpe:2.3:o:netapp:h410c_firmware:-:*:*:*:*:*:*:*

References for CVE-2022-40303

URL Tags
http://seclists.org/fulldisclosure/2022/Dec/21 Mailing List Third Party Advisory
http://seclists.org/fulldisclosure/2022/Dec/24 Mailing List Third Party Advisory
http://seclists.org/fulldisclosure/2022/Dec/25 Mailing List Third Party Advisory
http://seclists.org/fulldisclosure/2022/Dec/26 Mailing List Third Party Advisory
http://seclists.org/fulldisclosure/2022/Dec/27
https://gitlab.gnome.org/GNOME/libxml2/-/commit/c846986356fc149915a74972bf198abc266bc2c0 Patch Third Party Advisory
https://gitlab.gnome.org/GNOME/libxml2/-/tags/v2.10.3 Release Notes Third Party Advisory
https://security.netapp.com/advisory/ntap-20221209-0003/ Third Party Advisory
https://support.apple.com/kb/HT213531 Third Party Advisory
https://support.apple.com/kb/HT213533 Third Party Advisory
https://support.apple.com/kb/HT213534 Third Party Advisory
https://support.apple.com/kb/HT213535 Third Party Advisory
https://support.apple.com/kb/HT213536 Third Party Advisory
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