Security readout for executives and security teams
Plain-English summary
CVE-2026-46509 affects the JavaScript package deepobj before 1.0.3. If an application lets untrusted users control deep property paths, an attacker could alter JavaScript object prototypes, affecting data integrity and potentially availability. The vendor states version 1.0.3 fixes the issue.
Executive priority
Treat as high priority for JavaScript services using deepobj. Prioritize systems that accept user-controlled field paths, JSON structures, configuration keys, or API parameters that reach deep object operations.
Technical view
deepobj before 1.0.3 allows prototype pollution when property paths include __proto__, constructor, or prototype. The CVSS 3.1 score is 8.2, with network attack vector, no privileges, no user interaction, high integrity impact, and low availability impact.
Likely exposure
Exposure is limited to applications using ranfdev deepobj versions before 1.0.3, especially where property paths can be influenced by users or external input. The source bundle does not identify downstream applications or platforms.
Exploitation context
No active exploitation is cited, and KEV status is false. The advisory warns that property paths must not be exposed as user input. Evidence in the bundle supports risk, but not exploitation in the wild.
Researcher notes
The core condition is user influence over path segments containing __proto__, constructor, or prototype. The provided sources do not include proof-of-concept details, exploit telemetry, or broader ecosystem impact. Keep analysis scoped to deepobj before 1.0.3.
Mitigation direction
- Upgrade deepobj to version 1.0.3 or later.
- Do not expose deepobj property paths to untrusted user input.
- Audit dependency manifests and lockfiles for deepobj before 1.0.3.
- Check vendor guidance for any additional hardening recommendations.
Validation and detection
- Confirm installed deepobj versions across direct and transitive dependencies.
- Review code paths passing external input into deepobj get, set, or delete operations.
- Verify the dependency lockfile resolves deepobj to 1.0.3 or later.
- Run regression tests covering object mutation and input handling paths.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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Open ATT&CK lookupCVE-2026-46509 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L3.94.2GitHub_MVulnerability scoring details
Base CVSS 3.1 score
8.2HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/ranfdev/deepobj/security/advisories/GHSA-x7q7-fchv-8h2jCVE reference, GitHub_M · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.