rangy vulnerable to Prototype Pollution

published 2023-02-24 3 y ago modified 2026-06-17 4 mo ago also GHSA-65rp-mhqf-8gj3 , EUVD-2023-0637

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits: 0; none known

All versions of the package rangy are vulnerable to Prototype Pollution when using the extend() function in file rangy-core.js.The function uses recursive merge which can lead an attacker to modify properties of the Object.prototype

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: partial
Assessed: 19 mo ago (2025-03-11)

Exploit prediction

0.77% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

security.snyk.io https://security.snyk.io/vuln/SNYK-JS-RANGY-3175702 referenced PoC, tagged "exploit" by a source, unverified
github.com https://github.com/timdown/rangy/issues/478 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	3.1	8.2	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
GitHub	3.1	8.2	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Affected packages

ecosystem	package	affected	fixed in
npm	rangy	<=1.3.1	no fix listed

Affected products

n/a rangy

Classification

Weakness

CWE-1321 Improperly Controlled Modification of Object Prototype Attributes

References

security.snyk.io /vuln/SNYK-JS-RANGY-3175702
web, exploit, third-party-advisory
github.com /timdown/rangy/issues/478
web, exploit, issue-tracking, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2023-26102
advisory
github.com /timdown/rangy
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary