What is CVE-2022-40303?

CVE-2022-40303 is a high-severity vulnerability in Apple Ipados, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2022-11-23.

How severe is CVE-2022-40303?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2022-40303 known to be exploited?

7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Integer overflow in Apple Ipados

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.

Vulnerability class: Integer Overflow

Published 2022-11-23 · last modified 2026-10-14.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.414 (98.7th percentile), scored 2026-10-18.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.230 · newest: 0.414 · change: +0.184

Affected products

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

Public proof-of-concept exploits

References

gitlab.gnome.org/GNOME/libxml2/-/tags/v2.10.3 (Third Party Advisory, Release Notes)
gitlab.gnome.org/GNOME/libxml2/-/commit/c846986356fc149915a74972bf198abc266bc2c0 (Patch, Third Party Advisory)
security.netapp.com/advisory/ntap-20221209-0003/ (Third Party Advisory)
support.apple.com/kb/HT213534 (Third Party Advisory)
support.apple.com/kb/HT213533 (Third Party Advisory)
support.apple.com/kb/HT213531 (Third Party Advisory)
support.apple.com/kb/HT213536 (Third Party Advisory)
support.apple.com/kb/HT213535 (Third Party Advisory)
seclists.org/fulldisclosure/2022/Dec/21 (mailing-list, Mailing List, Third Party Advisory)
seclists.org/fulldisclosure/2022/Dec/25 (mailing-list, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2022-40303?: CVE-2022-40303 is a high-severity vulnerability in Apple Ipados, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2022-11-23.
How severe is CVE-2022-40303?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2022-40303 known to be exploited?: 7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.