# CVE-2026-43718: Apple Safari and OS stack overflow via web content

Source: https://junglewise.ai/threats/cve-2026-43718-apple-safari-and-os-stack-overflow-via-web-content  
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-2026-43718 · Severity: info · CVSS 4.3 · Published 2026-06-29

A vulnerability in Apple's Safari web browser and operating systems could allow a maliciously crafted website to cause the browser to crash. This affects users on iPhone, iPad, and Mac who visit untrusted web content. While primarily a stability issue, it can disrupt operations and user productivity.

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

## Quick answers

**Is CVE-2026-43718 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-43718 being exploited in the wild.

**How severe is CVE-2026-43718?** Informational severity, with a CVSS score of 4.3, published 29 June 2026.

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

**Is there a fix for CVE-2026-43718?** 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-2026-43718 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-43718?** Check whether you run Apple iPadOS, Apple macOS Tahoe or Apple Safari 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 stack overflow vulnerability exists in Apple Safari, iOS, iPadOS, and macOS Tahoe due to insufficient input validation when processing web content. An attacker can exploit this by enticing a user to visit a maliciously crafted webpage, leading to a denial-of-service (DoS) condition via a browser crash. The issue was addressed by improving input validation in the affected components. Patches are available in Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, and macOS Tahoe 26.5.2.

## Affected products

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

## Timeline

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

## 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)
- [https://support.apple.com/en-us/127685](https://support.apple.com/en-us/127685)

## Related threats

- [Apple Bluetooth use-after-free vulnerability](https://junglewise.ai/threats/cve-2026-113970-a-use-after-free-issue-was-addressed-with-improved-memory)
- [Apple iOS, iPadOS, macOS, and related platforms rate limit bypass in AirPlay pairing](https://junglewise.ai/threats/cve-2026-113969-a-logic-issue-was-addressed-with-improved-state-management-this)
- [Apple iOS and iPadOS Bluetooth pairing code rate limit bypass](https://junglewise.ai/threats/cve-2026-113968-a-logic-issue-was-addressed-with-improved-state-management-this)
- [Apple iOS/iPadOS Bluetooth pairing bypass](https://junglewise.ai/threats/cve-2026-113965-this-issue-was-addressed-with-improved-checks-this-issue-is)
- [Apple iOS and iPadOS Bluetooth pairing rate limit bypass in CoreUtils](https://junglewise.ai/threats/cve-2026-113964-a-logic-issue-was-addressed-with-improved-state-management-this)