high severity ยท published 2026-08-18
A race condition causes a use-after-free, a memory-safety bug, in the Firefox and Thunderbird layout code for text and fonts. Mozilla fixed it in newer releases.
Fixed in: 153.1.0
CVE: CVE-2026-74969
Source: NVD
Fixlane has a reviewed fix procedure for this incident: a read-only check first, then the fix. Ask the Telegram bot, or connect an AI agent to the Fixlane MCP server and call get_fix_prompt with incident id 175 and your operating system.