What is the CVSS score of CVE-2026-27837?

CVE-2026-27837 has a CVSS 3.1 base score of 6.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L. EPSS exploitation probability: 0.1%.

Which versions of Dottie are affected by CVE-2026-27837?

Organizations using JavaScript. should be aware of moderate risk from CVE-2026-27837, a prototype pollution vulnerability rated CVSS 6.3.. A patch is available.

Is there a public PoC exploit available for CVE-2026-27837?

Yes, a public proof-of-concept exploit is available for CVE-2026-27837. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-27837?

Within 30 days: Identify affected systems running JavaScript. and apply vendor patches as part of regular patch cycle. Vendor patch is available.

Dottie CVE-2026-27837

MEDIUM

Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution) (CWE-1321)

2026-02-26 security-advisories@github.com

GHSA-r5mx-6wc6-7h9w

Code Injection Dottie Red Hat

6.3

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

6.3 MEDIUM

AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

Red Hat

6.3 MEDIUM

qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

PoC Detected

Feb 28, 2026 - 00:58 vuln.today

Public exploit code

Patch released

Feb 28, 2026 - 00:58 nvd

Patch available

CVE Published

Feb 26, 2026 - 01:16 nvd

MEDIUM 6.3

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

21 npm packages depend on dottie (19 direct, 2 indirect)

Ecosystem-wide dependent count for version 2.0.4.

DescriptionGitHub Advisory

Dottie provides nested object access and manipulation in JavaScript. Versions 2.0.4 through 2.0.6 contain an incomplete fix for CVE-2023-26132. The prototype pollution guard introduced in commit 7d3aee1 only validates the first segment of a dot-separated path, allowing an attacker to bypass the protection by placing __proto__ at any position other than the first. Both dottie.set() and dottie.transform() are affected. Version 2.0.7 contains an updated fix to address the residual vulnerability.

AnalysisAI

Dottie versions 2.0.4 through 2.0.6 suffer from an incomplete prototype pollution fix that allows attackers to bypass validation by placing __proto__ in non-first positions within dot-separated paths, affecting both dottie.set() and dottie.transform() functions. An attacker can exploit this to pollute object prototypes and achieve limited confidentiality, integrity, and availability impacts. …

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Vulnerability AssessmentAI

Risk Assessment	CVSS 6.3 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker could exploit this vulnerability to compromise the affected system.
Remediation	A vendor patch is available — apply it immediately. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 30 days: Identify affected systems running JavaScript. …

Threat intelligence, references, and detailed analysis are available after sign-in.

Vendor StatusVendor

CVE-2026-27837 vulnerability details – vuln.today

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