CVE-2020-26304
About
Foundation is a front-end framework. Versions 6.3.3 and prior contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). As of time of publication, it is unknown if any fixes are available.
Rainforest analyst review
The Foundation front-end framework ships regular expressions vulnerable to ReDoS: a carefully constructed input forces catastrophic backtracking, and the regex engine hangs, consuming CPU and stalling whatever's processing it. The advisory notes that at publication it was unknown whether a fix even existed.
How much this matters depends entirely on where those regexes run. If the vulnerable pattern only executes client-side against a user's own input, the blast radius is that user's browser. If it runs server-side against attacker-controllable data, it becomes a real availability lever. The lack of a known fix at disclosure raises the stakes on figuring that out yourself.
Our work is dependency inventory, including transitive pulls, since front-end frameworks sneak in as sub-dependencies, followed by a concrete determination of whether the affected regex ever processes untrusted input on a server. That analysis, not the 7.5, is what tells us whether this is a genuine DoS exposure or a theoretical one.
References
Related CVEs
No related CVEs.
Frequently asked questions
What is CVE-2020-26304?
Foundation is a front-end framework. Versions 6.3.3 and prior contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). As of time of publication, it is unknown if any fixes are available.
How severe is CVE-2020-26304?
CVE-2020-26304 carries a CVSS 3.1 base score of 7.5, rated high. On the Rainforest Risk Index — which weighs the severity alongside how easy the flaw is to reach and how broad its impact is — it scores 75 out of 100, in the high band.
How is CVE-2020-26304 exploited?
According to the CVSS vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H): attack vector Network, attack complexity Low, privileges required None, user interaction None. Impact on confidentiality None, integrity None and availability High.
Which products are affected by CVE-2020-26304?
Public advisories list the following as affected: foundation. Check the references on this page for the exact versions each vendor confirms.
How do I fix CVE-2020-26304?
Apply the fix the vendor published — the references on this page link to the primary advisories and patches. When patching can't happen right away, reduce the exposure of the affected component and watch it for exploitation attempts. Rainforest customers see this vulnerability correlated to their own assets and prioritized by real exposure, not by score alone.
Empower Your Security Strategy with Rainforest
Discover vulnerabilities early, prioritize critical threats, and protect what truly matters. Rainforest streamlines your security operations, saving you time and reducing costs, so you can focus on what drives your business forward.