# CVE-2026-43703: Apple iOS and macOS denial of service in web content processing

Source: https://junglewise.ai/threats/cve-2026-43703-apple-ios-and-macos-denial-of-service-in-web-content-processing  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-29. Updated: 2026-06-29  
License: CC BY 4.0 with a link back

CVE-2026-43703 · Severity: info · CVSS 6.1 · Published 2026-06-29

Apple has released security updates for iPhone, iPad, and Mac to address a memory handling issue. If a user visits a website containing specially crafted malicious content, it could cause the web browser or associated system processes to crash unexpectedly. This primarily impacts the reliability and availability of the device's web-related services.

Technologies: [Apple iPadOS](https://junglewise.ai/threats/technologies/ipados), [Apple macOS](https://junglewise.ai/threats/technologies/macos). Vendors: [Apple](https://junglewise.ai/threats/vendors/apple).

## Quick answers

**Is CVE-2026-43703 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-43703 being exploited in the wild.

**How severe is CVE-2026-43703?** Informational severity, with a CVSS score of 6.1, published 29 June 2026.

**Which products and versions are affected?** Apple iPadOS < 26.5.2; Apple macOS < 26.5.2.

**Is there a fix for CVE-2026-43703?** A patch was published on 2026-06-29. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-43703 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-43703?** Check whether you run Apple iPadOS or Apple macOS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A memory handling vulnerability exists in Apple's operating systems (iOS, iPadOS, and macOS) when processing web content. The root cause is improper memory management, which can be triggered by a remote attacker who entices a user to visit a maliciously crafted webpage. Successful exploitation results in a denial-of-service (DoS) condition via an unexpected process crash. Apple has addressed this issue with improved memory handling in iOS 26.5.2, iPadOS 26.5.2, and macOS Tahoe 26.5.2.

## Affected products

- Apple iOS and iPadOS < 26.5.2
- Apple macOS Tahoe < 26.5.2

## Timeline

- 2026-06-29: disclosed
- 2026-06-29: patched

## References

- [https://support.apple.com/en-us/127594](https://support.apple.com/en-us/127594)
- [https://support.apple.com/en-us/127595](https://support.apple.com/en-us/127595)

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