CVE-2018-19876 — cairo 1

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.

01What is this vulnerability?

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.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2018-12-05T20:29:00.240
• Last modified: 2026-10-15T18:17:18.247

09References

• bugs.webkit.org — https://bugs.webkit.org/show_bug.cgi?id=191595
• gitlab.freedesktop.org — https://gitlab.freedesktop.org/cairo/cairo/merge_requests/5
• bugs.webkit.org — https://bugs.webkit.org/show_bug.cgi?id=191595
• gitlab.freedesktop.org — https://gitlab.freedesktop.org/cairo/cairo/merge_requests/5