CVE-2018-20822: LibSass 3.5.4 allows attackers to cause a denial-of-service (uncontrolled recursion in Sass::Complex_Select...

Security readout for executives and security teams

CVE-2018-20822 is a denial-of-service flaw in LibSass 3.5.4. A crafted Sass input can trigger uncontrolled recursion and crash or exhaust resources during Sass processing. Business impact is most relevant where Sass is processed from untrusted users, automated uploads, plugins, or build inputs. Exposure is likely limited to applications, CI systems, asset build services, or package workflows that use LibSass 3.5.4 and process attacker-controlled Sass or SCSS. Systems compiling only trusted, repository-controlled stylesheets have lower practical exposure. Treat as a targeted availability risk, not a broad remote compromise. Prioritize if customer-controlled themes, plugins, or uploads can reach LibSass; otherwise handle through normal dependency maintenance and vendor patch tracking. Mitigation focus: Inventory LibSass usage, including transitive build dependencies and distro packages.; Prioritize systems processing user-supplied Sass, SCSS, themes, plugins, or uploaded assets.; Review and apply applicable vendor security advisories, including relevant openSUSE updates..

Prepared

Jun 6, 2026, 21:12 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.