Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') Affecting gitlab-rails-ce-fips-19.1 package, versions <19.1.1-r1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published30 Jun 2026
- disclosed6 Apr 2026
Introduced: 6 Apr 2026
CVE-2026-35209 (opens in a new tab)How to fix?
Upgrade Chainguard gitlab-rails-ce-fips-19.1 to version 19.1.1-r1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream gitlab-rails-ce-fips-19.1 package and not the gitlab-rails-ce-fips-19.1 package as distributed by Chainguard.
See How to fix? for Chainguard relevant fixed versions and status.
defu is software that allows uers to assign default properties recursively. Prior to version 6.1.5, applications that pass unsanitized user input (e.g. parsed JSON request bodies, database records, or config files from untrusted sources) as the first argument to defu() are vulnerable to prototype pollution. A crafted payload containing a __proto__ key can override intended default values in the merged resul. The internal _defu function used Object.assign({}, defaults) to copy the defaults object. Object.assign invokes the __proto__ setter, which replaces the resulting object's [[Prototype]] with attacker-controlled values. Properties inherited from the polluted prototype then bypass the existing __proto__ key guard in the for...in loop and land in the final result. Version 6.1.5 replaces Object.assign({}, defaults) with object spread ({ ...defaults }), which uses [[DefineOwnProperty]] and does not invoke the __proto__ setter.