CVE-2026-93753

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Source
https://cve.org/CVERecord?id=CVE-2026-93753
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93753.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-93753
Downstream
Published
2026-09-18T17:51:37Z
Modified
2026-09-20T11:47:30Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
deepmerge through 4.3.1 Prototype Poisoning via mergeObject
Details

deepmerge through 4.3.1 contains a prototype poisoning vulnerability in the mergeObject() function that fails to properly validate keys being written to target objects. Attackers can supply malicious source objects in merge operations to inject attacker-controlled properties into the returned object's prototype, causing applications to inherit unintended values when accessing properties without own-property checks.

Database specific 
{
    "cna_assigner":  "VulnCheck",
    "cwe_ids":  [
        "CWE-1321"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93753.json"
}
References

Affected packages

Git / github.com/tehshrike/deepmerge

Affected ranges

Type
GIT
Repo
https://github.com/tehshrike/deepmerge
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
5b87756a5671635679001cbac72aa42f23472c81
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "last_affected":  "4.3.1"
        },
        {
            "fixed":  "4.3.1"
        }
    ],
    "source":  [
        "AFFECTED_FIELD",
        "DESCRIPTION"
    ]
}

Affected versions

v0.*
v0.0.1
v0.1.0
v0.2.0
v0.2.1
v0.2.4
v0.2.5
v0.2.8
v0.2.9
v1.*
v1.0.1
v1.0.2
v1.0.3
v1.1.0
v1.1.1
v1.2.0
v1.3.0
v1.3.1
v1.3.2
v1.4.0
v1.4.1
v1.4.2
v1.4.3
v1.4.4
v1.5.0
v1.5.1
v1.5.2
v2.*
v2.0.0
v2.0.1
v2.1.0
v2.1.1
v2.2.0
v2.2.1
v3.*
v3.0.0
v3.1.0
v3.2.0
v3.2.1
v3.3.0
v4.*
v4.0.0
v4.1.0
v4.1.1
v4.1.2
v4.2.0
v4.2.1
v4.2.2
v4.3.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93753.json"