# CVE-2025-66287: Webkitgtk: processing maliciously crafted web content may lead to an unexpected process crash

Status: published. Published: 2025-12-04. Updated: 2026-11-04.

A flaw was found in WebKitGTK. Processing malicious web content can cause an unexpected process crash due to improper memory handling.

## Remediation

- workaround: Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible. (source: CNA: redhat)

## Affected products and versions

- The WebKitGTK Team / WebKitGTK (webkitgtk): ≥ 0; < 2.50.3 (affected, semver). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Support (webkitgtk4): ≥ 0:2.50.3-2.el7_9; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (webkit2gtk3): ≥ 0:2.50.3-1.el8_10; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.2 Advanced Update Support (webkit2gtk3): ≥ 0:2.50.3-2.el8_2; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support (webkit2gtk3): ≥ 0:2.50.3-2.el8_4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On (webkit2gtk3): ≥ 0:2.50.3-2.el8_4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (webkit2gtk3): ≥ 0:2.50.3-2.el8_6; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Telecommunications Update Service (webkit2gtk3): ≥ 0:2.50.3-2.el8_6; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions (webkit2gtk3): ≥ 0:2.50.3-2.el8_6; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service (webkit2gtk3): ≥ 0:2.50.3-2.el8_8; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions (webkit2gtk3): ≥ 0:2.50.3-2.el8_8; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (webkit2gtk3): ≥ 0:2.50.3-1.el9_7; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions (webkit2gtk3): ≥ 0:2.50.3-1.el9_0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions (webkit2gtk3): ≥ 0:2.50.3-1.el9_2; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.4 Extended Update Support (webkit2gtk3): ≥ 0:2.50.3-1.el9_4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Support (webkit2gtk3): ≥ 0:2.50.3-1.el9_6; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (webkitgtk): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (webkitgtk3): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 8.8 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H; source: CNA: redhat

- CVSS 3.1: 8.8 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 0.51% as of 2026-11-04; percentile 43.39%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-120

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/errata/RHSA-2025:22789 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:22790 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:23110 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:23433 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:23434 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:23451 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:23452 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:23583 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:23591 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:23742 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:23743 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2025-66287 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2418857 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://webkitgtk.org/security/WSA-2025-0009.html (CNA: redhat)

- https://access.redhat.com/errata/RHSA-2025:22789 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:22790 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:23110 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:23433 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:23434 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:23451 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:23452 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:23583 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:23591 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:23742 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:23743 (secalert@redhat.com)

- https://access.redhat.com/security/cve/CVE-2025-66287 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2418857 (secalert@redhat.com)

- https://webkitgtk.org/security/WSA-2025-0009.html (secalert@redhat.com)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2025-66287; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-66287; retrieved 2026-11-05; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2025-66287; retrieved 2026-11-04; source updated Not reported

Revision: d28aa2cad9ba1297f0be78928583fa5c9be9059cb3a7d2b312ce69a492eb305c

Canonical: https://y2.dev/cve/CVE-2025-66287

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