CVE-2025-43504: A buffer overflow was addressed with improved bounds checking

Q: How do I fix CVE-2025-43504?

xcode: upgrade to 26.1. Exact commands for each OS are on this page.

Q: Is CVE-2025-43504 being exploited?

CVE-2025-43504 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-2025-43504 affect?

CVE-2025-43504 affects xcode. Severity is medium (CVSS 4.9). A buffer overflow was addressed with improved bounds checking. This issue is fixed in Xcode 26.1. A user in a privileged network position may be able to cause a denial-of-service.

Q: How urgent is CVE-2025-43504?

Priority 25/100. No elevated risk signals yet.

Routine

MEDIUM 4.9UPGRADE

CVE-2025-43504 is a medium-severity flaw (CVSS 4.9) affecting xcode. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A buffer overflow was addressed with improved bounds checking. This issue is fixed in Xcode 26.1. A user in a privileged network position may be able to cause a denial-of-service.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.9 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-119
Published	2025-11-04
Last modified	2026-10-18

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

Last updated 2026-10-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-04 02:15 UTCPublished CVE record published
2026-10-18 21:10 UTCUpdated Record last modified

apple xcode UPGRADE

Affected: < 26.1

Fixed in: 26.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 26.1 (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-2025-43504?

xcode: upgrade to 26.1. Exact commands for each OS are on this page.

Is CVE-2025-43504 being exploited?

CVE-2025-43504 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-2025-43504 affect?

CVE-2025-43504 affects xcode. Severity is medium (CVSS 4.9). A buffer overflow was addressed with improved bounds checking. This issue is fixed in Xcode 26.1. A user in a privileged network position may be able to cause a denial-of-service.

How urgent is CVE-2025-43504?

Priority 25/100. 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-2026-86874 LOW 3.3 UPGRADE An out-of-bounds read was addressed with improved input validation
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

References

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