CVE-2026-29063 is a Prototype Pollution vulnerability affecting Immutable.js, a library for persistent immutable data structures, specifically impacting versions prior to 3.8.3, 4.3.7, and 5.1.5. This high-severity flaw (CVSS 8.7) allows unauthenticated attackers to remotely manipulate object prototypes through various APIs like mergeDeep() and Map.toJS(), potentially leading to denial of service or other impacts. While the vulnerability is patched in newer versions, there is currently no evidence of active exploitation, public exploit code, or significant community discussion.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 3.0.0, < 3.8.3CPE matchmatch criteria | cpe:2.3:a:immutable-js:immutable:*:*:*:*:*:node.js:*:* | ||
>= 4.0.0, < 4.3.7CPE matchmatch criteria | cpe:2.3:a:immutable-js:immutable:*:*:*:*:*:node.js:*:* | ||
>= 5.0.0, < 5.1.5CPE matchmatch criteria | cpe:2.3:a:immutable-js:immutable:*:*:*:*:*:node.js:*:* |
CVSS version used by this source: 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/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, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.