Apple Xcode: Sandbox escape via missing library validation
Summary
Apple Xcode, the development toolchain for Apple platforms, contains a flaw that allows an app to break out of its sandbox. Apple fixed the issue by enforcing library validation on the affected binaries. Exploitation requires a malicious app already running locally on the Mac, so the risk is mainly relevant to organisations that build software on Macs.
Affected
- Apple Xcode versions before 27 (per CVE record)
- Apple advisory lists Xcode for macOS Tahoe 26.6 and later
- Exact point releases and build numbers: Unknown.
Fixed in
- Xcode 27 (released September 14, 2026)
Workaround
Unknown. No workaround is provided by Apple or the CVE record.
Exploitation
- Exploitation in the wild: Not known.
- CISA SSVC: exploitation none, automatable no.
- Public proof of concept: None found in limited research.
- Attack vector: local.
Our recommendation
- Update Xcode to version 27 or later on all developer Macs.
- Inventory Macs with Xcode installed and prioritise development teams.
- Limit installation of unvetted apps on developer Macs as a general interim measure.
- Monitor vendor advisories for further updates.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Apple Security Content of Xcode 27 support.apple.com
- OpenCVE CVE-2026-86948 app.opencve.io
- VulDB CVE-2026-86948 vuldb.com
- CVE record mirror (threatint) cve.threatint.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 31 Oct 2026, 15:37.
Original description (NVD)
This issue was addressed by enforcing library validation on the affected binaries. This issue is fixed in Xcode 27. An app may be able to break out of its sandbox.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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