CVE-2026-6621 | 1024bit extend-deep up to 0.1.6 index.js __proto__ prototype pollution

VDB-358256 · SUBMIT #792387 · CVE-2026-6621 1024BIT EXTEND-DEEP UP TO 0.1.6 INDEX.JS __PROTO__ PROTOTYPE POLLUTION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.6 $0-$5k 1.81+ Summaryinfo A vulnerability labeled as critical has been found in 1024bit extend-deep up to 0.1.6. This affects an unknown function of the file index.js. Such manipulation of the argument __proto__ leads to prototype pollution. This vulnerability is documented as CVE-2026-6621. The attack can be executed remotely. Additionally, an exploit exists. The code repository of the project has not been active for many years. Detailsinfo A vulnerability, which was classified as critical, has been found in 1024bit extend-deep up to 0.1.6. Affected by this issue is an unknown part of the file index.js. The manipulation of the argument __proto__ with an unknown input leads to a prototype pollution vulnerability. Using CWE to declare the problem leads to CWE-1321. 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. Impacted is confidentiality, integrity, and availability. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-6621. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details as well as a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1059. The exploit is available at github.com. It is declared as proof-of-concept. The code repository of the project has not been active for many years. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. Productinfo Vendor 1024bit Name extend-deep Version 0.1.0 0.1.1 0.1.2 0.1.3 0.1.4 0.1.5 0.1.6 CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 7.3 VulDB Meta Temp Score: 6.6 VulDB Base Score: 7.3 VulDB Temp Score: 6.6 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Prototype pollution CWE: CWE-1321 / CWE-94 / CWE-74 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Access: Public Status: Proof-of-Concept Download: 🔒 Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 04/19/2026 Advisory disclosed 04/19/2026 +0 days VulDB entry created 04/19/2026 +0 days VulDB entry last update Sourcesinfo Advisory: github.com Status: Not defined CVE: CVE-2026-6621 (🔒) GCVE (CVE): GCVE-0-2026-6621 GCVE (VulDB): GCVE-100-358256 scip Labs: https://www.scip.ch/en/?labs.20161013 Entryinfo Created: 04/19/2026 18:31 Changes: 04/19/2026 18:31 (56) Complete: 🔍 Submitter: sudosme Cache ID: 99:FEC:101 Submitinfo Accepted Submit #792387: 1024bit extend-deep 0.1.6 Prototype Pollution (by sudosme) Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸