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No exploitation reportedFix available

CVE-2023-40403

No exploitation reported by the sources we read.

  • Published2023-09-27
  • Fixed in13.6 · 12.7

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The issue was addressed with improved memory handling. This issue is fixed in macOS Ventura 13.6, tvOS 17, iOS 16.7 and iPadOS 16.7, macOS Monterey 12.7, watchOS 10, iOS 17 and iPadOS 17, macOS Sonoma 14. Processing web content may disclose sensitive information.

Timeline

dates in UTC
  1. 2023-09-2715:19CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-40403?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-40403?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Apple macos
BranchAffectedFixed in
13.x≥ 13.0, < 13.613.6
12.x≥ 12.0.0, < 12.712.7
Apple ipados
BranchAffectedFixed in
16.7< 16.716.7
Apple iphone os
BranchAffectedFixed in
16.7< 16.716.7

2 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libxsltAlmaLinux:9all versions · fixed in 1.1.34-14.el9_7.1and 1 other package
  • libxsltAlmaLinux:8all versions · fixed in 1.1.32-6.2.el8_10and 1 other package

Vendor advisories

  • RHSA-2026:10065 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Update Infrastructure 5.1 security update

Full record on NVD

Fix

  1. Update Apple macos to 13.6 · 12.7
  2. Vendor fix Red Hat Product Security RHSA-2026:10065 · 1 productThe container images provided by this release, apart from the installer, should be deployed using rhui-installer utility. See the official documentation for more details.
  3. Workaround from the vendor Red Hat Product Security RHSA-2026:10065 · 4 productsMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Published
2023-09-27
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2023-40403?

The issue was addressed with improved memory handling. This issue is fixed in macOS Ventura 13.6, tvOS 17, iOS 16.7 and iPadOS 16.7, macOS Monterey 12.7, watchOS 10, iOS 17 and iPadOS 17, macOS Sonoma 14. Processing web content may disclose sensitive information.

Is CVE-2023-40403 actively exploited?

Active exploitation of CVE-2023-40403 has not been confirmed. Its EPSS score was 1.3% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-40403?

CVE-2023-40403 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

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