NVD / CVE Program· CNA redhat

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

Noroxi assessment

Priority: Monitor (action score 35/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.50% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
Fixed version: The WebKitGTK Team WebKitGTK 2.50.3.

Low priority for now. Upgrade to The WebKitGTK Team WebKitGTK 2.50.3 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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

HighCVSS 8.8 · v3.1—No exploit Fix available

Published: Dec 4, 2025
Updated: Nov 4, 2026
EPSS: 0.5% · 43th percentile
CWE: CWE-120

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 35 / 40 · 8.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.5%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · redhat: 8.8; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

Red Hat Red Hat Enterprise Linux 6
- all versionsunknown
Red Hat Red Hat Enterprise Linux 7
- all versionsaffected
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
- 0:2.50.3-2.el7_9 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 8
- 0:2.50.3-1.el8_10 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support
- 0:2.50.3-2.el8_2 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
- 0:2.50.3-2.el8_4 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
- 0:2.50.3-2.el8_4 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
- 0:2.50.3-2.el8_6 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service
- 0:2.50.3-2.el8_6 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
- 0:2.50.3-2.el8_6 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
- 0:2.50.3-2.el8_8 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
- 0:2.50.3-2.el8_8 and laternot affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
AlmaLinux:9	webkit2gtk3	before 2.50.3-1.el9_7	2.50.3-1.el9_7
AlmaLinux:9	webkit2gtk3-devel	before 2.50.3-1.el9_7	2.50.3-1.el9_7
AlmaLinux:9	webkit2gtk3-jsc	before 2.50.3-1.el9_7	2.50.3-1.el9_7
AlmaLinux:9	webkit2gtk3-jsc-devel	before 2.50.3-1.el9_7	2.50.3-1.el9_7
Debian:11	webkit2gtk	before 2.50.3-1~deb11u1	2.50.3-1~deb11u1
Debian:12	webkit2gtk	before 2.50.3-1~deb12u1	2.50.3-1~deb12u1
Debian:12	wpewebkit	from 0	—
Debian:13	webkit2gtk	before 2.50.3-1~deb13u1	2.50.3-1~deb13u1
Debian:14	webkit2gtk	before 2.50.3-1	2.50.3-1
Debian:14	wpewebkit	before 2.50.3-1	2.50.3-1
Red Hat:enterprise_linux:8::appstream	webkit2gtk3	before 0:2.50.3-1.el8_10	0:2.50.3-1.el8_10
Red Hat:enterprise_linux:8::appstream	webkit2gtk3-debuginfo	before 0:2.50.3-1.el8_10	0:2.50.3-1.el8_10
Red Hat:enterprise_linux:8::appstream	webkit2gtk3-debugsource	before 0:2.50.3-1.el8_10	0:2.50.3-1.el8_10
Red Hat:enterprise_linux:8::appstream	webkit2gtk3-devel	before 0:2.50.3-1.el8_10	0:2.50.3-1.el8_10
Red Hat:enterprise_linux:8::appstream	webkit2gtk3-devel-debuginfo	before 0:2.50.3-1.el8_10	0:2.50.3-1.el8_10
Red Hat:enterprise_linux:8::appstream	webkit2gtk3-jsc	before 0:2.50.3-1.el8_10	0:2.50.3-1.el8_10
Red Hat:enterprise_linux:8::appstream	webkit2gtk3-jsc-debuginfo	before 0:2.50.3-1.el8_10	0:2.50.3-1.el8_10
Red Hat:enterprise_linux:8::appstream	webkit2gtk3-jsc-devel	before 0:2.50.3-1.el8_10	0:2.50.3-1.el8_10
Red Hat:enterprise_linux:8::appstream	webkit2gtk3-jsc-devel-debuginfo	before 0:2.50.3-1.el8_10	0:2.50.3-1.el8_10
Red Hat:enterprise_linux:9::appstream	webkit2gtk3	before 0:2.50.3-1.el9_7	0:2.50.3-1.el9_7
Red Hat:enterprise_linux:9::appstream	webkit2gtk3-debuginfo	before 0:2.50.3-1.el9_7	0:2.50.3-1.el9_7
Red Hat:enterprise_linux:9::appstream	webkit2gtk3-debugsource	before 0:2.50.3-1.el9_7	0:2.50.3-1.el9_7
Red Hat:enterprise_linux:9::appstream	webkit2gtk3-devel	before 0:2.50.3-1.el9_7	0:2.50.3-1.el9_7
Red Hat:enterprise_linux:9::appstream	webkit2gtk3-devel-debuginfo	before 0:2.50.3-1.el9_7	0:2.50.3-1.el9_7

+88

Same product

the webkitgtk team: all records

Other highest-scoring records for the same primary product.

CVE-2025-13502Webkit: webkitgtk / wpe webkit: out-of-bounds read and integer underflow vulnerability leading to dos
30Monitor
CVE-2025-13947Webkit: webkitgtk: remote user-assisted information disclosure via file drag-and-drop
29Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
The WebKitGTK Team WebKitGTK	2.50.3	Vendor (CNA)
almalinux:webkit2gtk3	2.50.3-1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:webkit2gtk3	2.50.3-1.el9_7 · AlmaLinux:9	Package registry (OSV)
almalinux:webkit2gtk3-devel	2.50.3-1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:webkit2gtk3-devel	2.50.3-1.el9_7 · AlmaLinux:9	Package registry (OSV)
almalinux:webkit2gtk3-jsc	2.50.3-1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:webkit2gtk3-jsc	2.50.3-1.el9_7 · AlmaLinux:9	Package registry (OSV)
almalinux:webkit2gtk3-jsc-devel	2.50.3-1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:webkit2gtk3-jsc-devel	2.50.3-1.el9_7 · AlmaLinux:9	Package registry (OSV)
debian:webkit2gtk	2.50.3-1~deb12u1 · Debian:12	Package registry (OSV)
debian:wpewebkit	2.50.3-1 · Debian:14	Package registry (OSV)
red hat:webkit2gtk3	0:2.50.3-1.el8_10 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:webkit2gtk3-debuginfo	0:2.50.3-1.el8_10 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:webkit2gtk3-debugsource	0:2.50.3-1.el8_10 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:webkit2gtk3-devel	0:2.50.3-1.el8_10 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:webkit2gtk3-devel-debuginfo	0:2.50.3-1.el8_10 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:webkit2gtk3-jsc	0:2.50.3-1.el8_10 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:webkit2gtk3-jsc-debuginfo	0:2.50.3-1.el8_10 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:webkit2gtk3-jsc-devel	0:2.50.3-1.el8_10 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:webkit2gtk3-jsc-devel-debuginfo	0:2.50.3-1.el8_10 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:webkitgtk4	0:2.50.3-2.el7_9 · Red Hat:rhel_els:7	Package registry (OSV)
red hat:webkitgtk4-debuginfo	0:2.50.3-2.el7_9 · Red Hat:rhel_els:7	Package registry (OSV)
red hat:webkitgtk4-devel	0:2.50.3-2.el7_9 · Red Hat:rhel_els:7	Package registry (OSV)
rocky linux:webkit2gtk3	0:2.50.3-1.el8_10 · Rocky Linux:8	Package registry (OSV)
suse:webkit2gtk3	2.50.3-150400.4.130.4 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	Package registry (OSV)
suse:webkit2gtk3-soup2	2.50.3-150400.4.130.4 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	Package registry (OSV)
suse:webkit2gtk4	2.50.3-150400.4.130.4 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
A user must open a link or visit a page.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: Required
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CVSS vector

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

nvd-secondary

Root cause

When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.

The bug in code

The whole CWE-120 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1char buf[256];
2memcpy(buf, pkt->data, pkt->len);

Fixed

1char buf[256];
2if (pkt->len > sizeof(buf)) {
3  return -EINVAL;
4}
5memcpy(buf, pkt->data, pkt->len);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

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Change log

Fix✗ → ✓Sep 28, 2026, 10:08 PM UTC

For records you follow, these changes also arrive as notifications. →

References

access.redhat.com/errata/RHSA-2025:22789

Show all references (13 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records