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Actively exploited in the wild. This CVE is on the CISA Known Exploited Vulnerabilities list — treat remediation as urgent. Federal remediation due by 3 Apr 2026.
SafariWeb browser · Apple

CVE-2025-31277

HIGH · 8.8 CVSS v3.1 Published 2025-07-30
Fix available
A fix is available. Upgrade to 18.6 or later.
See remediation →
100/100
Remediation priority · Urgent
In the wild Remotely reachable No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

A memory corruption vulnerability in WebKit allows processing of maliciously crafted web content to trigger memory corruption. The issue stems from improper memory handling and affects Safari and WebKit-based browsers across iOS, iPadOS, macOS, tvOS, visionOS, and watchOS.

MitigationApply the vendor-supplied updates: Safari 18.6, iOS/iPadOS 18.6, macOS Sequoia 15.6, tvOS 18.6, visionOS 2.6, and watchOS 11.6.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
SafariWeb browser
Affected:< 18.6
Enterprise LinuxOperating system
Affected:= 6.0= 7.0= 8.0= 9.0
Enterprise Linux AusOperating system
Affected:= 8.2= 8.4= 8.6
Enterprise Linux ElsOperating system
Affected:= 7.0
Enterprise Linux EusOperating system
Affected:= 8.4= 8.6= 9.4
Enterprise Linux TusOperating system
Affected:= 8.6= 8.8
Enterprise Linux Update Services For Sap SolutionsOperating system
Affected:= 8.6= 8.8= 9.0= 9.2
IpadosOperating system
Affected:< 18.6

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Check Safari version on macOS
    Open Safari, then go to Safari > About Safari (or press Cmd+comma) and note the version number displayed
    Affected if Version is earlier than 18.6 (for example, 18.5.x or earlier)
  2. Check iOS version on iPhone or iPad
    On the device, go to Settings > General > About and note the version number under Software Version
    Affected if Version is earlier than 18.6 (for example, 18.5.x or earlier)
  3. Check iPadOS version on iPad
    On the device, go to Settings > General > About and note the version number under Software Version
    Affected if Version is earlier than 18.6 (for example, 18.5.x or earlier)
  4. Check Red Hat Enterprise Linux version
    Run the command 'cat /etc/redhat-release' in a terminal to display the installed RHEL version
    Affected if Version exactly matches 6.0, 7.0, 8.0, 9.0, 8.2, 8.4, 8.6, 8.8, 9.2, or 9.4 as listed in the affected versions

You are affected if you run any Safari version before 18.6, any iOS/iPadOS version before 18.6, or a Red Hat Enterprise Linux version that exactly matches one of the listed affected versions.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 18.6 or later
Fixed in 18.6
Interim mitigation

Apply the vendor-supplied updates: Safari 18.6, iOS/iPadOS 18.6, macOS Sequoia 15.6, tvOS 18.6, visionOS 2.6, and watchOS 11.6.

Recommended fix High confidence

iOS 18.6 / iPadOS 18.6 / Safari 18.6 / macOS Sequoia 15.6 / tvOS 18.6 / visionOS 2.6 / watchOS 11.6

  1. For iOS devices: Upgrade to iOS 18.6 or later via Settings > General > Software Update
  2. For iPadOS devices: Upgrade to iPadOS 18.6 or later via Settings > General > Software Update
  3. For Safari: Upgrade to Safari 18.6 (included with macOS Sequoia 15.6 or via standalone update for earlier macOS)
  4. For macOS: Upgrade to macOS Sequoia 15.6 or later via System Settings > General > Software Update
  5. For Apple TV: Upgrade to tvOS 18.6 or later via Settings > System > Software Updates
  6. For Apple Watch: Upgrade to watchOS 11.6 or later via the Watch app on iPhone
  7. For Apple Vision Pro: Upgrade to visionOS 2.6 or later
Caveat Standard OS upgrade considerations apply - review app compatibility before upgrading production devices

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Safari Exploited in the wild — priority engagement
  • Consultation1.0 h
  • Implementation1.0 h
  • Testing1.0 h
  • Review / QA1.0 h
4.0 hours of engineering $750
Get it fixed fast

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,200.

Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-31277 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data