CVE-2026-86874: An out-of-bounds read was addressed with improved input validation

Q: How do I fix CVE-2026-86874?

xcode: upgrade to 27.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-86874 being exploited?

CVE-2026-86874 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-86874 affect?

CVE-2026-86874 affects xcode. Severity is low (CVSS 3.3). An out-of-bounds read was addressed with improved input validation. This issue is fixed in Xcode 27. Parsing a maliciously crafted binary may lead to unexpected tool termination.

Q: How urgent is CVE-2026-86874?

Priority 13/100. No elevated risk signals yet.

Routine

LOW 3.3UPGRADE

CVE-2026-86874 is a low-severity flaw (CVSS 3.3) affecting xcode. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An out-of-bounds read was addressed with improved input validation. This issue is fixed in Xcode 27. Parsing a maliciously crafted binary may lead to unexpected tool termination.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.3 (Low)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-125
Published	2026-10-20
Last modified	2026-10-29

Publisher (CNA): Apple Inc. · Vendor: apple

Last updated 2026-10-29 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-20 01:17 UTCPublished CVE record published
2026-10-29 15:55 UTCUpdated Record last modified

apple xcode UPGRADE

Affected: < 27.0

Fixed in: 27.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy xcode || rpm -q xcode || xcode --version

2. UPGRADE to 27.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade xcode

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade xcode

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-86874?

xcode: upgrade to 27.0. Exact commands for each OS are on this page.

Is CVE-2026-86874 being exploited?

CVE-2026-86874 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-86874 affect?

CVE-2026-86874 affects xcode. Severity is low (CVSS 3.3). An out-of-bounds read was addressed with improved input validation. This issue is fixed in Xcode 27. Parsing a maliciously crafted binary may lead to unexpected tool termination.

How urgent is CVE-2026-86874?

Priority 13/100. No elevated risk signals yet.

Related CVEs

CVE-2026-86948 HIGH 8.8 UPGRADE This issue was addressed by enforcing library validation on the affected binaries
CVE-2026-86875 MEDIUM 4.3 UPGRADE An input validation issue was addressed with improved input validation
CVE-2026-86949 HIGH 8.8 UPGRADE This issue was addressed by enforcing library validation on the affected binaries
CVE-2025-43505 HIGH 8.8 UPGRADE An out-of-bounds write issue was addressed with improved input validation
CVE-2025-43504 MEDIUM 4.9 UPGRADE A buffer overflow was addressed with improved bounds checking

References

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