The issue was addressed with improved memory handling.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Fix
- Fixed in 18.6, 15.6, 2.6, 11.6
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
This vulnerability affects Apple's Safari web browser and its operating systems, including iOS, iPadOS, macOS, tvOS, visionOS, and watchOS. Processing maliciously crafted web content could cause memory corruption, which may allow an attacker to disrupt the software or potentially run unauthorized code.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
The issue was addressed with improved memory handling. This issue is fixed in Safari 18.6, iOS 18.6 and iPadOS 18.6, macOS Sequoia 15.6, tvOS 18.6, visionOS 2.6, watchOS 11.6. Processing maliciously crafted web content may lead to memory corruption.
Timeline
- CVE published
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CISA remediation deadline
Due date for US federal agencies to patch
- Record last updated
Affected versions
- Apple Safari
fixed in 18.6
- Apple iOS and iPadOS
fixed in 18.6
- Apple macOS
fixed in 15.6
- Apple tvOS
fixed in 18.6
- Apple visionOS
fixed in 2.6
- Apple watchOS
fixed in 11.6
References 6
Questions about CVE-2025-31277
What does this mean?
Maliciously crafted web content can cause memory corruption in Apple's WebKit-based browsing, which may let an attacker corrupt process memory. Apple's advisory describes the bug as processing crafted web content leading to memory corruption.Source: support.apple.com
Am I affected, and how do I check?
The advisory lists Safari, iOS and iPadOS, macOS, tvOS, visionOS, and watchOS as affected in versions before Safari 18.6, iOS and iPadOS 18.6, macOS 15.6, tvOS 18.6, visionOS 2.6, and watchOS 11.6. To check a device, compare its current version under the system's software update or About settings against those fixed versions.Source: support.apple.com
What should I do about it?
Update Safari to 18.6 and the operating systems to the fixed versions listed for each product: iOS and iPadOS 18.6, macOS 15.6, tvOS 18.6, visionOS 2.6, or watchOS 11.6.Source: support.apple.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2026-03-20, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data