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CVE-2026-20643· NVD / CVE Program· CNA apple

A cross-origin issue in the Navigation API was addressed with improved input validation.

Noroxi assessment

Priority: Monitor (action score 21/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.36% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: webkit2gtk3 (AlmaLinux:8) 2.52.3-1.el8_10; webkit2gtk3-devel (AlmaLinux:8) 2.52.3-1.el8_10; webkit2gtk3-jsc (AlmaLinux:8) 2.52.3-1.el8_10.

Low priority for now. Upgrade to webkit2gtk3 (AlmaLinux:8) 2.52.3-1.el8_10; webkit2gtk3-devel (AlmaLinux:8) 2.52.3-1.el8_10; webkit2gtk3-jsc (AlmaLinux:8) 2.52.3-1.el8_10 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A cross-origin issue in the Navigation API was addressed with improved input validation. This issue is fixed in Background Security Improvements for iOS, iPadOS, and macOS, Safari 26.4, iOS 18.7.7 and iPadOS 18.7.7, iOS 26.4 and iPadOS 26.4, macOS Tahoe 26.4, visionOS 26.4. Processing maliciously crafted web content may bypass Same Origin Policy.

MediumCVSS 5.4 · v3.1—Proof of concept Fix available
Published
Mar 17, 2026
Updated
Aug 17, 2026
EPSS
0.3% · 28th percentile

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.4 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-20643

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
appleipados
appleiphone os
applemacos

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • apple ipadosbefore 26.3.1
  • apple iphone osbefore 26.3.1
  • apple macosbefore 26.3.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (apple). Independent of NVD's CPE analysis and usually ahead of it.

  • Apple iOS and iPadOS

    • before 18.7.7affected
    • before 26.3.1 (a)affected
    • before 26.4affected

  • Apple macOS

    • before 26.3.1 (a)affected
    • before 26.3.2 (a)affected
    • before 26.4affected

  • Apple Safari

    • before 26.4affected

  • Apple visionOS

    • before 26.4affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8webkit2gtk3before 2.52.3-1.el8_102.52.3-1.el8_10
AlmaLinux:8webkit2gtk3-develbefore 2.52.3-1.el8_102.52.3-1.el8_10
AlmaLinux:8webkit2gtk3-jscbefore 2.52.3-1.el8_102.52.3-1.el8_10
AlmaLinux:8webkit2gtk3-jsc-develbefore 2.52.3-1.el8_102.52.3-1.el8_10
AlmaLinux:9webkit2gtk3before 2.52.3-1.el9_82.52.3-1.el9_8
AlmaLinux:9webkit2gtk3before 2.52.3-0.el9_7.12.52.3-0.el9_7.1
AlmaLinux:9webkit2gtk3-develbefore 2.52.3-0.el9_7.12.52.3-0.el9_7.1
AlmaLinux:9webkit2gtk3-develbefore 2.52.3-1.el9_82.52.3-1.el9_8
AlmaLinux:9webkit2gtk3-jscbefore 2.52.3-1.el9_82.52.3-1.el9_8
AlmaLinux:9webkit2gtk3-jscbefore 2.52.3-0.el9_7.12.52.3-0.el9_7.1
AlmaLinux:9webkit2gtk3-jsc-develbefore 2.52.3-1.el9_82.52.3-1.el9_8
AlmaLinux:9webkit2gtk3-jsc-develbefore 2.52.3-0.el9_7.12.52.3-0.el9_7.1
Debian:12webkit2gtkall versions—
Debian:12wpewebkitall versions—
Debian:13webkit2gtkbefore 2.52.3-2~deb13u12.52.3-2~deb13u1
Debian:14webkit2gtkbefore 2.52.1-12.52.1-1
Debian:14wpewebkitbefore 2.52.1-12.52.1-1
openSUSE:Leap 16.0webkit2gtk3before 2.52.1-160000.1.12.52.1-160000.1.1
openSUSE:Leap 16.0webkit2gtk3-soup2before 2.52.1-160000.1.12.52.1-160000.1.1
openSUSE:Leap 16.0webkit2gtk4before 2.52.1-160000.1.12.52.1-160000.1.1
Red Hat:enterprise_linux:8::appstreamwebkit2gtk3before 0:2.52.3-1.el8_100:2.52.3-1.el8_10
Red Hat:enterprise_linux:8::appstreamwebkit2gtk3-debuginfobefore 0:2.52.3-1.el8_100:2.52.3-1.el8_10
Red Hat:enterprise_linux:8::appstreamwebkit2gtk3-debugsourcebefore 0:2.52.3-1.el8_100:2.52.3-1.el8_10
Red Hat:enterprise_linux:8::appstreamwebkit2gtk3-develbefore 0:2.52.3-1.el8_100:2.52.3-1.el8_10

+96

Same product

apple: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-30860An integer overflow was addressed with improved input validation.KEV
    84Now
  • CVE-2025-43300An out-of-bounds write issue was addressed with improved bounds checking.KEV
    80Now
  • CVE-2023-41064A buffer overflow issue was addressed with improved memory handling.KEV
    77This week
  • CVE-2023-32434An integer overflow was addressed with improved input validation.KEV
    76This week
  • CVE-2025-24085A use after free issue was addressed with improved memory management.KEV
    75This week
  • CVE-2023-41993The issue was addressed with improved checks.KEV
    72This week

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:webkit2gtk32.52.3-1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:webkit2gtk3-devel2.52.3-1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:webkit2gtk3-jsc2.52.3-1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:webkit2gtk3-jsc-devel2.52.3-1.el8_10 · AlmaLinux:8Package registry (OSV)
debian:webkit2gtk2.52.3-2~deb13u1 · Debian:13Package registry (OSV)
debian:wpewebkit2.52.1-1 · Debian:14Package registry (OSV)
opensuse:webkit2gtk32.52.1-150600.12.63.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:webkit2gtk3-soup22.52.1-150600.12.63.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:webkit2gtk42.52.1-150600.12.63.1 · openSUSE:Leap 15.6Package registry (OSV)
red hat:webkit2gtk30:2.52.3-1.el8_10 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:webkit2gtk3-debuginfo0:2.52.3-1.el8_10 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:webkit2gtk3-debugsource0:2.52.3-1.el8_10 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:webkit2gtk3-devel0:2.52.3-1.el8_10 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:webkit2gtk3-devel-debuginfo0:2.52.3-1.el8_10 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:webkit2gtk3-jsc0:2.52.3-1.el8_10 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:webkit2gtk3-jsc-debuginfo0:2.52.3-1.el8_10 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:webkit2gtk3-jsc-devel0:2.52.3-1.el8_10 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:webkit2gtk3-jsc-devel-debuginfo0:2.52.3-1.el8_10 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:webkitgtk40:2.52.3-1.el7_9 · Red Hat:rhel_els:7Package registry (OSV)
red hat:webkitgtk4-debuginfo0:2.52.3-1.el7_9 · Red Hat:rhel_els:7Package registry (OSV)
red hat:webkitgtk4-devel0:2.52.3-1.el7_9 · Red Hat:rhel_els:7Package registry (OSV)
rocky linux:webkit2gtk30:2.52.3-1.el8_10 · Rocky Linux:8Package registry (OSV)
suse:webkit2gtk32.52.1-150600.12.63.1 · SUSE:Linux Enterprise Module for Desktop Applications 15 SP7Package registry (OSV)
suse:webkit2gtk3-soup22.52.1-150600.12.63.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)
suse:webkit2gtk42.52.1-150600.12.63.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×2

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:212026-03-17
Proof-of-concept repository on GitHubstars:32026-03-20

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-1 d
  2. Published
  3. TodayOct 17, 2026+214 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-43347183 days apartThis issue was addressed by removing the vulnerable code.
    39Monitor
  • CVE-2025-43234231 days apartMultiple memory corruption issues were addressed with improved input validation.
    39Monitor
  • CVE-2026-39868104 days apartThis issue was addressed with improved input validation.
    36Monitor
  • CVE-2025-31281231 days apartAn input validation issue was addressed with improved memory handling.
    36Monitor
  • CVE-2026-2890755 days apartThe issue was addressed with improved input validation.
    32Monitor
  • CVE-2026-43724104 days apartThe issue was addressed with improved input sanitization.
    31Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-20 · Improper Input Validation

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records