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CVE-2026-78376— Webkitgtk: use-after-free of jscvalue function parameters

Quick assessment

Affected
WebKit WebKit
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WebKitGTK 中发现一个缺陷。在处理恶意网页内容时，由于内存管理不当，可能导致使用释放后的内存（use-after-free）漏洞，进而引发内存损坏。

CVSS 8.8 · High EPSS 0.28% · P20

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 7

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 6 any unknown
Red Hat Red Hat Enterprise Linux 7 any affected
any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
WebKit WebKit 2.21.1< * affected
WebKitGTK WebKitGTK 2.21.1< * affected
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I. Basic Information for CVE-2026-78376

Vulnerability Information
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Vulnerability Title
Webkitgtk: use-after-free of jscvalue function parameters
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in WebKitGTK. Processing malicious web content can cause a use-after-free issue due to improper memory handling and result in memory corruption.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
WebKit WebKit 2.21.1 ~ * -
WebKitGTK WebKitGTK 2.21.1 ~ * -
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-78376

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III. Intelligence Information for CVE-2026-78376

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Vendor Advisories for CVE-2026-78376 (2)

IV. Related Vulnerabilities

Same product: WebKit
Same vendor: WebKit
Same weakness: CWE-416

V. Comments for CVE-2026-78376

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