What is CVE-2025-43370?

CVE-2025-43370 is a medium-severity vulnerability in Apple Xcode, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 4.0/10. Published 2025-09-15.

How severe is CVE-2025-43370?

Medium severity. CVSS v3 base score is 4.0 out of 10.

Is CVE-2025-43370 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Apple Xcode

CVE-2025-43370

A path handling issue was addressed with improved validation. This issue is fixed in Xcode 26. Processing an overly large path value may crash a process.

Vulnerability class: Buffer Overflow

Published 2025-09-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.003 (25.5th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Apple Xcode — versions 0

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

calysteon/calysteon

References

support.apple.com/en-us/125117 (Release Notes, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2025-43370?: CVE-2025-43370 is a medium-severity vulnerability in Apple Xcode, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 4.0/10. Published 2025-09-15.
How severe is CVE-2025-43370?: Medium severity. CVSS v3 base score is 4.0 out of 10.
Is CVE-2025-43370 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.