CVE-2026-30226 is a prototype pollution vulnerability affecting Svelte devalue versions 5.6.3 and earlier, specifically within the devalue.parse and devalue.unflatten functions. Rated 7.5 HIGH (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), this vulnerability allows unauthenticated attackers to remotely cause Denial of Service (DoS) or type confusion with low attack complexity. The vulnerability is fixed in version 5.6.4. There is no evidence of active exploitation, public exploit code is currently unavailable, and community discussion and media coverage are minimal.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 5.6.4CPE matchmatch criteria | cpe:2.3:a:svelte:devalue:*:*:*:*:*:node.js:*:* |
CVSS version used by this source: 4.0
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.