critical severity ยท published 2026-08-18
Internally found bugs in Firefox and Thunderbird. Some of these bugs showed evidence of memory corruption or another security-relevant defect, and the vendor presumes that with enough effort some could have been exploited.
Fixed in: 153.1.0
CVE: CVE-2026-74988
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 178 and your operating system.