CVE-2026-42077Public exploit

Prototype pollution via unfiltered mailbox field merges

Published May 4, 2026 · Updated May 4, 2026

Prototype pollution in EvoMap Evolver before 1.69.3 allows local users to alter JavaScript object behavior through mailbox data. The mailbox store's _applyUpdate() and _updateRecord() methods pass fields from messages.jsonl to Object.assign() without rejecting proto, constructor, or prototype keys. Exploitation requires write access to the mailbox persistence file and can corrupt application logic, expose limited data, or interrupt the process.

CVSS severity5.2
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prototype pollution in EvoMap Evolver before 1.69.3 allows local users to alter JavaScript object behavior through mailbox data. The mailbox store's _applyUpdate() and _updateRecord() methods pass fields from messages.jsonl to Object.assign() without rejecting proto, constructor, or prototype keys. Exploitation requires write access to the mailbox persistence file and can corrupt application logic, expose limited data, or interrupt the process.

The record

CVE
CVE-2026-42077
Published
May 4, 2026
Updated
May 4, 2026
Vendor
EvoMap
Product
Evolver
Classifications
CWE-1321, T1565.001
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. May 4, 2026CVE publishedPublication date reported by the CVE source.
  2. May 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.69.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

EvoMap · Evolverversion=< 1.69.3

Published CVSS scores

5.2GitHubCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
T1565.001Stored Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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