CVE-2026-27837: Dottie provides nested object access and manipulation in JavaScript

Q: How do I fix CVE-2026-27837?

dottie: upgrade to 2.0.7. Exact commands for each OS are on this page.

Q: Is CVE-2026-27837 being exploited?

CVE-2026-27837 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-27837 affect?

CVE-2026-27837 affects dottie. Severity is medium (CVSS 6.3). 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

Q: How urgent is CVE-2026-27837?

Priority 35/100. Public exploit reference

Routine

MEDIUM 6.3UPGRADE

CVE-2026-27837 is a medium-severity flaw (CVSS 6.3) affecting dottie. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 contain

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 70%)
CISA exploited list	No
Weakness	CWE-1321
Published	2026-02-26
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: dottie project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-26 01:16 UTCPublished CVE record published
2026-06-17 10:27 UTCUpdated Record last modified

dottie project dottie UPGRADE

Affected: >= 2.0.4 and < 2.0.7

Fixed in: 2.0.7

Safe to downgrade to: a release before 2.0.4

1. Check installed version

npm ls dottie

2. UPGRADE to 2.0.7

npm install dottie@">=2.0.7"

3. If no update is available yet, DOWNGRADE to a release before 2.0.4

npm view dottie versions npm install dottie@"<2.0.4"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-27837?

dottie: upgrade to 2.0.7. Exact commands for each OS are on this page.

Is CVE-2026-27837 being exploited?

CVE-2026-27837 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-27837 affect?

CVE-2026-27837 affects dottie. Severity is medium (CVSS 6.3). 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

How urgent is CVE-2026-27837?

Priority 35/100. Public exploit reference

References

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