CVE-2018-19876

cairo 1.16.0, in cairo_ft_apply_variations() in cairo-ft-font.c, would free memory using a free function incompatible with WebKit's fastMalloc, leading to an application crash with a "free(): invalid pointer" error.

Published: 2018-12-05 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-19876 is rated Moderate Risk (53.4/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.71%). EPSS rose +1.41% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2018-19876

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.30% 1.71% +1.41%
2 2026-01-29 0.20% 0.30% +0.10%
3 2025-08-30 — 0.20% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-19876

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.0 MEDIUM
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2018-19876

OS Trackers for CVE-2018-19876

vendor priority summary link
alpine medium CVE-2018-19876: 1 source package rows (cairo); 19 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 19, open 0. https://security.alpinelinux.org/vuln/CVE-2018-19876
debian not yet assigned CVE-2018-19876 not yet assigned priority: Debian including 1 source packages (cairo), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2018-19876
redhat low — https://access.redhat.com/security/cve/CVE-2018-19876
ubuntu negligible CVE-2018-19876 negligible priority: Ubuntu including 1 source packages (cairo), 6 status rows across 6 suites (bionic, cosmic, disco, trusty, upstream, xenial): not-affected 4, DNE 1, released 1. https://ubuntu.com/security/CVE-2018-19876

Affected software / configurations for CVE-2018-19876

Vendor Product Version Raw CPE
cairographics cairo 1.16.0 cpe:2.3:a:cairographics:cairo:1.16.0:*:*:*:*:*:*:*

References for CVE-2018-19876

URL Tags
https://bugs.webkit.org/show_bug.cgi?id=191595 Issue Tracking Patch Third Party Advisory
https://gitlab.freedesktop.org/cairo/cairo/merge_requests/5 Patch Third Party Advisory
cvelogic Threat Intelligence