CVE-2026-28931

HIGH 8.8 ALL-YEARS

Published 2026-07-27 · Last modified 2026-07-29 · apple · NVD: Analyzed

A buffer overflow was addressed with improved bounds checking. This issue is fixed in iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, tvOS 26.6, watchOS 26.6. Connecting to a malicious NFS server may lead to kernel memory corruption.

ELEVATED IMPACT

Severe if exploited (CVSS 8.8), but no confirmed exploitation. Patch on a normal cadence.

Exploitation likelihood

0.5%chance of exploitation in 30 days · 42nd percentile

○ In CISA KEV○ Catalogued PoC◆ SSVC: exploitation none, automatable no

Impact if exploited

8.8CVSS 3.1 · HIGH · ADP

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

What an attacker needs

✓Access: Reachable over the network — no local access needed
✓Privileges: No account or privileges required
⚠User interaction: A user must take an action (click / open a file)
✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Affected

Vendors Apple

Products Ios And Ipados Macos Tvos Watchos Ipados Iphone Os

Weakness (CWE)

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

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References and research data (JSON)

Known Affected Software Configurations

Vendor	Product	Version range
Apple	Ipados	< 26.6
Apple	Iphone Os	< 26.6
Apple	Macos	≥ 26.0 and < 26.6
Apple	Tvos	< 26.6
Apple	Watchos	< 26.6

All CVSS metrics

HIGH 8.8 v3.1 · ADP Primary
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
HIGH 8.8 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

Advisories

https://support.apple.com/en-us/128066 Release NotesVendor AdvisoryCVE record · apple · Updated 2026-07-27T20:14:05.946Z
NVD · CVE-2026-28931 · Updated 2026-07-29T05:16:43.780
https://support.apple.com/en-us/128067 Release NotesVendor AdvisoryCVE record · apple · Updated 2026-07-27T20:14:05.946Z
NVD · CVE-2026-28931 · Updated 2026-07-29T05:16:43.780
https://support.apple.com/en-us/128068 Release NotesVendor AdvisoryCVE record · apple · Updated 2026-07-27T20:14:05.946Z
NVD · CVE-2026-28931 · Updated 2026-07-29T05:16:43.780
https://support.apple.com/en-us/128069 Release NotesVendor AdvisoryCVE record · apple · Updated 2026-07-27T20:14:05.946Z
NVD · CVE-2026-28931 · Updated 2026-07-29T05:16:43.780
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-49422 ADVISORYEUVD · EUVD-2026-49422

Sources: NVD · CVE.org · All sources and attribution · EPSS