Improper input validation in macOS - CVE-2026-1837

Vulnerability identifier: #VU131017

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-1837

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper input validation in AppleJPEG when parsing input. A remote attacker can send a specially crafted input to cause a denial of service.

macOS
Ubuntu
Apple iOS
iPadOS
tvOS
visionOS
watchOS
jpeg-xl (Ubuntu package)

Install update from vendor's website.

macOS - update to 26.5 25F71
Apple iOS - update to 26.5 23F77
iPadOS - update to 26.5 23F77
tvOS - update to 26.5 23L471
visionOS - update to 26.5
watchOS - update to 26.5 23T570
jpeg-xl (Ubuntu package) - update to 0.11.1-6ubuntu1.1

• https://support.apple.com/en-us/127115

• Multiple vulnerabilities in Apple macOS Tahoe
• Multiple vulnerabilities in Apple iOS 26 and iPadOS 26
• Multiple vulnerabilities in Apple tvOS
• Multiple vulnerabilities in Apple watchOS
• Multiple vulnerabilities in Apple visionOS
• Ubuntu update for jpeg-xl