What is CVE-2018-12293?

CVE-2018-12293 is a high-severity vulnerability in Webkitgtk Webkitgtk\+, classified under Integer Overflow or Wraparound. CVSS score: 8.8/10. Published 2018-06-19.

How severe is CVE-2018-12293?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2018-12293 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Webkitgtk Webkitgtk\+

CVE-2018-12293

The getImageData function in the ImageBufferCairo class in WebCore/platform/graphics/cairo/ImageBufferCairo.cpp in WebKit, as used in WebKitGTK+ prior to version 2.20.3 and WPE WebKit prior to version 2.20.1, is vulnerable to a heap-based buffer overflow triggered by an integer overflow, which could be abused by crafted HTML content.

Vulnerability class: Integer Overflow

Published 2018-06-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.104 (95.6th percentile), scored 2026-09-30.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 95.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.104 · newest: 0.104 · change: 0.000

Affected products

Webkitgtk Webkitgtk\+
Wpewebkit Wpe Webkit
Canonical Ubuntu Linux — versions 16.04, 17.10, 18.04

Weakness classification (CWE)

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

bugs.webkit.org/show_bug.cgi (Permissions Required, Vendor Advisory)
security.gentoo.org/glsa/201808-04 (vendor-advisory)
www.securityfocus.com/archive/1/542087/100/0/threaded (mailing-list)
www.exploit-db.com/exploits/45205/ (exploit)
trac.webkit.org/changeset/232618 (Patch, Third Party Advisory, Vendor Advisory)
usn.ubuntu.com/3687-1/ (vendor-advisory, Third Party Advisory)
packetstormsecurity.com/files/148200/WebKitGTK-Data-Leak-Code-Execution.html (VDB Entry, Third Party Advisory)
www.openwall.com/lists/oss-security/2018/06/14/1 (mailing-list, Technical Description, Mailing List)

Frequently asked questions

What is CVE-2018-12293?: CVE-2018-12293 is a high-severity vulnerability in Webkitgtk Webkitgtk\+, classified under Integer Overflow or Wraparound. CVSS score: 8.8/10. Published 2018-06-19.
How severe is CVE-2018-12293?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2018-12293 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.