# CVE-2026-86874: Apple Xcode otool out-of-bounds read

Source: https://junglewise.ai/threats/cve-2026-86874-an-out-of-bounds-read-was-addressed-with-improved-input  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-20. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-86874 · Severity: info · Published 2026-10-20

Xcode is Apple's development toolkit used by software developers to build applications. A flaw in the otool component—a binary analysis tool bundled with Xcode—allows a maliciously crafted binary to crash the tool unexpectedly. An attacker could exploit this to disrupt development workflows or trigger denial of service.

Technologies: [Apple Xcode](https://junglewise.ai/threats/technologies/xcode). Vendors: [Apple](https://junglewise.ai/threats/vendors/apple).

## Quick answers

**Is CVE-2026-86874 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-86874 being exploited in the wild.

**How severe is CVE-2026-86874?** Informational severity, published 20 October 2026.

**Which products and versions are affected?** Apple Xcode before 27.

**Is there a fix for CVE-2026-86874?** Yes: fixed in Xcode 27. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-86874 attacked?** It is attacked with local access, in a web application.

**Am I affected by CVE-2026-86874?** Check whether you run Apple Xcode 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.

## How to fix

- Fixed in Xcode 27

## Technical details

The otool binary parser contains an out-of-bounds read vulnerability triggered when processing a maliciously crafted binary file. The flaw stems from insufficient input validation and allows an attacker with a specially crafted binary to cause unexpected tool termination. The vulnerability is fixed in Xcode 27 via improved input validation in the parsing logic.

## Affected products

- Apple Xcode before 27

## Timeline

- 2026-10-19: disclosed
- 2026-09-14: patched: Xcode 27 released

## References

- [https://support.apple.com/en-us/149040](https://support.apple.com/en-us/149040)

## Related threats

- [Apple Xcode symlink handling arbitrary file read](https://junglewise.ai/threats/cve-2026-112605-this-issue-was-addressed-with-improved-handling-of-symlinks-this)
- [Apple Xcode Instruments authorization issue](https://junglewise.ai/threats/cve-2026-112602-an-authorization-issue-was-addressed-with-improved-state)
- [Apple Xcode sandbox escape in library validation](https://junglewise.ai/threats/cve-2026-86949-this-issue-was-addressed-by-enforcing-library-validation-on-the)
- [Apple Xcode sandbox escape via library validation](https://junglewise.ai/threats/cve-2026-86948-this-issue-was-addressed-by-enforcing-library-validation-on-the)
- [Apple Xcode CoreSymbolication input validation flaw](https://junglewise.ai/threats/cve-2026-86875-an-input-validation-issue-was-addressed-with-improved-input)