CVE-2025-66287: the webkitgtk team webkitgtk Classic Buffer Overflow
CVSS: 8.8v3.1HighDeferred
AliasesUBUNTU-CVE-2025-66287DEBIAN-CVE-2025-66287
Published 04-12-2025Last modified 29-06-2026
Vulnerability summary
CVE-2025-66287 is a high (CVSS 8.8) Classic Buffer Overflow vulnerability in the webkitgtk team webkitgtk. EPSS estimates a 0.47% chance of exploitation in the next 30 days, higher than 39.5% of scored vulnerabilities.
CVSS score
8.8/10
010
High · v3.1 (CVE.org)EPSS score
0.47%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 20 · Related 6DLA-4399-1DSA-6074-1MGASA-2025-0325OPENSUSE-SU-2026:20065-1RHSA-2025:22789RHSA-2025:22790RHSA-2025:23110RHSA-2025:23433RHSA-2025:23434RHSA-2025:23451RHSA-2025:23452RHSA-2025:23583RHSA-2025:23591RHSA-2025:23742RHSA-2025:23743SUSE-SU-2025:4416-1SUSE-SU-2025:4423-1SUSE-SU-2026:0021-1SUSE-SU-2026:20102-1USN-7941-1
Timeline
- 04-12-2025PublishedVulnerability first disclosed.
- 29-06-2026Last modifiedVulnerability information updated.
Description
A flaw was found in WebKitGTK. Processing malicious web content can cause an unexpected process crash due to improper memory handling.
CVSS metrics
4 scores · 4 sources · 1 versionHigh 8.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- NVDNIST8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.47%
Chance of exploitation in the next 30 days
Percentile
40%
Versus all other CVEs
30-day change
0.00 pp
From 0.47% on 19-09-2026
19-09-202619-10-2026
EPSS score0.47%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu5 products
- qtwebkit-opensource-srcAll versions (No fix recorded)
- qtwebkit-sourceAll versions (No fix recorded)
- webkit2gtkAll versions (No fix recorded) | < 2.50.3-0ubuntu0.22.04.1 | < 2.50.3-0ubuntu0.24.04.1 | < 2.50.3-0ubuntu0.25.10.1
- webkitgtkAll versions (No fix recorded)
- wpewebkitAll versions (No fix recorded)
Debian2 products
- webkit2gtk< 2.50.3-1~deb12u1 | < 2.50.3-1~deb13u1 | < 2.50.3-1
- wpewebkitAll versions (No fix recorded) | < 2.50.3-1
The webkitgtk team1 product
- webkitgtk< 2.50.3
3 vendors · 8 products
