CVE-2026-93753
deepmerge mergeObject() allows prototype poisoning of returned objects
This CVE ID has been rejected because it does not describe a security vulnerability.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
GitHub Advisories Score usedGHSA-gcqx-w48m-w2h4
deepmerge mergeObject() allows prototype poisoning of returned objects
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.
- Record
GHSA-gcqx-w48m-w2h4- CVSS 4.0
- 2.7 Low
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-1321
- Updated
- 2026-11-02
CVE List No score
This CVE ID has been rejected because it does not describe a security vulnerability.
- Record
CVE-2026-93753- Updated
- 2026-11-02
EUVDEUVD-2026-83258
This CVE ID has been rejected because it does not describe a security vulnerability.
- Record
EUVD-2026-83258- CVSS 4.0
- 8.7 High
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 - Updated
- 2026-11-03
NVD No score
Rejected reason: This CVE ID has been rejected because it does not describe a security vulnerability.
- Record
CVE-2026-93753- Updated
- 2026-11-02
OSV
deepmerge through 4.3.1 Prototype Poisoning via mergeObject
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.
- Record
CVE-2026-93753- CVSS 4.0
- 8.7 High
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 - Weakness
- CWE-1321
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-93753
- Record
DEBIAN-CVE-2026-93753- CVSS 4.0
- 8.7 High
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Updated
- 2026-11-03
OSVGHSA-gcqx-w48m-w2h4
deepmerge mergeObject() allows prototype poisoning of returned objects
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.
- Record
GHSA-gcqx-w48m-w2h4- CVSS 4.0
- 2.7 Low
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-1321
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-93753
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.
- Record
UBUNTU-CVE-2026-93753- CVSS 4.0
- 8.7 High
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 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-05
OSVopenSUSE-SU-2026:12285-1 No score
golang-github-prometheus-prometheus-3.15.0-2.1 on GA media
These are all security issues fixed in the golang-github-prometheus-prometheus-3.15.0-2.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2026:12285-1- Updated
- 2026-11-02
Affected packages
| Package | Affected | Fixed |
|---|---|---|
deepmergenpm |
4.2.0 to 4.3.1 | None known |
node-deepmergeDebian:12 |
All versions, plus listed versions 4.2.2+~1.1.1-34.3.1+~1.1.1-1 |
None known |
node-deepmergeDebian:13 |
All versions, plus listed versions 4.3.1+~1.1.1-1 |
None known |
node-deepmergeDebian:14 |
All versions, plus listed versions 4.3.1+~1.1.1-1 |
None known |
golang-github-prometheus-prometheusopenSUSE:Tumbleweed |
before 3.15.0-2.1 | 3.15.0-2.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | OSV | |
| products, references | EUVD | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-93753 has been rejected by its source and should not be treated as a live vulnerability, published September 18, 2026. EPSS puts the chance of exploitation in the next 30 days at 0.51%, the 43rd percentile. Fixed in golang-github-prometheus-prometheus 3.15.0-2.1.
References
nvd.nist.gov/vuln/detail/CVE-2026-93753
github.com/TehShrike/deepmerge/issues/273
vulncheck.com/advisories/deepmerge-through-4.3.1-prototype-poisoning-via-mergeobject