SecuriTricks - CVE-2025-13204

Description

npm package `expr-eval` is vulnerable to Prototype Pollution. An attacker with access to express eval interface can use JavaScript prototype-based inheritance model to achieve arbitrary code execution. The npm expr-eval-fork package resolves this issue.

Product(s) Impacted

Vendor	Product	Versions
Npm	Expr-eval Expr-eval-fork	* *

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-1321

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	npm	expr-eval	/	/	/	/	/	/	/	/
a	npm	expr-eval-fork	/	/	/	/	/	/	/	/

References

https://github.com/SECCON/SECCON2022_final_CTF/blob/main/jeopardy/web/babybox/solver/solver.py

https://github.com/jorenbroekema/expr-eval

https://github.com/silentmatt/expr-eval

https://github.com/silentmatt/expr-eval/pull/252/files

https://github.com/vladko312/extras/blob/f549d505af300fd74a01b46fab2102990ff1c14d/expr-eval.py

https://www.huntr.dev/bounties/1-npm-expr-eval/

https://www.npmjs.com/package/expr-eval-fork

CVSS Score

7.3 / 10

CVSS Data - 3.1

Attack Vector: NETWORK
Attack Complexity: LOW
Privileges Required: NONE
Scope: UNCHANGED
Confidentiality Impact: LOW
Integrity Impact: LOW
Availability Impact: LOW

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

View Vector String

Timeline

Published: Nov. 14, 2025, 5:16 p.m.
Last Modified: Nov. 14, 2025, 9:15 p.m.

Status : Received

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

cret@cert.org

CVE-2025-13204