CVE-2025-31277
HighExploitedPublic exploitwebkitgtk: Processing maliciously crafted web content may lead to memory corruption
Published Mar 18, 2026 · Updated Sep 21, 2026 · Also known as DEBIAN-CVE-2025-31277, UBUNTU-CVE-2025-31277
Key Facts
Patch immediately- CVE-2025-31277 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Safari (Apple), Webkitgtk, Wpe Webkit (Wpewebkit) and 22 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 18, 2026. Public exploit code is available.
- EPSS estimates a 1.6% probability of exploitation in the next 30 days.
- Fixed versions are available, including Ipados 18.6, Iphone OS 18.6, macOS 15.6.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
1.6%
Higher than 75.4% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2025-31277 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Mar 20, 2026 | Apr 3, 2026 | Not reported |
| Industry KEV feed | Mar 18, 2026 | Apr 3, 2026 | Not reported |
| CIRCL KEV | Mar 20, 2026 | Apr 3, 2026 | Not reported |
| ENISA EUVD | Mar 20, 2026 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected Products
426 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| SafariApple | See advisory | 18.6 |
| WebkitgtkWebkitgtk | See advisory | 2.50.0 |
| Wpe WebkitWpewebkit | See advisory | 2.50.0 |
| IpadosApple | See advisory | 18.6 |
| Iphone OSApple | See advisory | 18.6 |
Patched Releases
Ipados
18.6
Iphone OS
18.6
macOS
15.6
Safari
18.6
tvOS
18.6
visionOS
2.6
watchOS
11.6
iOS and iPadOS
18.6
libjavascriptcoregtk-4_0-18
2.52.0-150400.4.137.3, 2.52.0-4.54.1, 2.52.1-150600.12.63.1, 2.52.1-160000.1.1
libjavascriptcoregtk-4_0-18-32bit
2.52.1-150600.12.63.1
libjavascriptcoregtk-4_1-0
2.52.0-150400.4.137.3, 2.52.1-150600.12.63.1, 2.52.1-160000.1.1
libjavascriptcoregtk-4_1-0-32bit
2.52.1-150600.12.63.1
libjavascriptcoregtk-6_0-1
2.52.0-150400.4.137.3, 2.52.1-150600.12.63.1, 2.52.1-160000.1.1
libwebkit2gtk-4_0-37
2.52.0-150400.4.137.3, 2.52.0-4.54.1, 2.52.1-150600.12.63.1, 2.52.1-160000.1.1
libwebkit2gtk-4_0-37-32bit
2.52.1-150600.12.63.1
libwebkit2gtk-4_1-0
2.52.0-150400.4.137.3, 2.52.1-150600.12.63.1, 2.52.1-160000.1.1
libwebkit2gtk-4_1-0-32bit
2.52.1-150600.12.63.1
libwebkit2gtk3-lang
2.52.0-4.54.1
libwebkitgtk-6_0-4
2.52.0-150400.4.137.3, 2.52.1-150600.12.63.1, 2.52.1-160000.1.1
typelib-1_0-JavaScriptCore-4_0
2.52.0-150400.4.137.3, 2.52.0-4.54.1, 2.52.1-150600.12.63.1, 2.52.1-160000.1.1
typelib-1_0-JavaScriptCore-4_1
2.52.0-150400.4.137.3, 2.52.1-150600.12.63.1, 2.52.1-160000.1.1
typelib-1_0-JavaScriptCore-6_0
2.52.1-150600.12.63.1, 2.52.1-160000.1.1
typelib-1_0-WebKit-6_0
2.52.1-150600.12.63.1, 2.52.1-160000.1.1
typelib-1_0-WebKit2-4_0
2.52.0-150400.4.137.3, 2.52.0-4.54.1, 2.52.1-150600.12.63.1, 2.52.1-160000.1.1
typelib-1_0-WebKit2-4_1
2.52.0-150400.4.137.3, 2.52.1-150600.12.63.1, 2.52.1-160000.1.1
Timeline
Publicly disclosed
Mar 18, 2026
Added to Industry KEV feed
Mar 18, 2026
Added to CISA KEV
Mar 20, 2026
Added to CIRCL KEV
Mar 20, 2026
Added to ENISA EUVD
Mar 20, 2026
Last updated
Sep 21, 2026
Weakness Type
- CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
- CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
References
- advisoryRHSA-2025:17643
- advisoryRHSA-2025:17741
- advisoryRHSA-2025:17743
- advisoryRHSA-2025:17802
- advisoryRHSA-2025:17807
FAQ
Common Questions.
The issue was addressed with improved memory handling.
Affected: Safari (Apple); Webkitgtk; Wpe Webkit (Wpewebkit), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 18, 2026.
Yes. It was added on Mar 20, 2026 with a federal remediation due date of Apr 3, 2026.
Public exploit code is available.
Fixed versions are available, including Ipados 18.6, Iphone OS 18.6, macOS 15.6.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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