CVE-2026-28931: 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

highCVSS 8.8CVE-2026-28931

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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: high — CVSS 8.8
Published: 2026-07-27
Last updated: 2026-07-29
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-28931

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-289310.28% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 20% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-28931	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[NEW] [high] Apple macOS (Tahoe, Sonoma, and Sequoia): Multiple vulnerabilitiescert-bund
medium[NEW] [medium] Apple iOS and iPadOS: Multiple vulnerabilitiescert-bund
unknownNCSC-2026-0267 [1.00] [M/H] Vulnerabilities fixed in Apple MacOSncsc-nl
unknownNCSC-2026-0266 [1.00] [M/H] Vulnerabilities fixed in Apple iOS and iPadOSncsc-nl
unknownApple Products Multiple Vulnerabilitieshkcert
unknownMultiple vulnerabilities in Apple products (July 28, 2026)cert-fr-avis

Recent advisories for A buffer overflow

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-67305: FreeRDP Windows client before 3.29.0 contains a heap buffer overflow vulnerability in the clip…nvd · 2026-08-01
highCVE-2026-67298: FreeRDP versions 3.28.0 and earlier contain a heap buffer overflow in the server-side RAIL cha…nvd · 2026-08-01
mediumCVE-2026-18321: Buffer overflow in NTPsec's Zyfer refclock allows local attacker to crash ntpdnvd · 2026-07-31
criticalCVE-2026-67822: Tenda W6-S 1.0.0.4(510) contains a stack-based buffer overflow vulnerability in the /goform/wi…nvd · 2026-07-31
highCVE-2026-15722: A stack buffer overflow flaw was found in 389 Directory Server (389-ds-base). The get_ruveleme…nvd · 2026-07-31
highCVE-2026-10535: IBM Db2 11.5.0 through 11.5.9, and 12.1.0 through 12.1.4 is vulnerable to buffer overflow in s…nvd · 2026-07-30