CVE-2026-35041 | nearform fast-jwt up to 6.2.0 JWT redos

VDB-356579 · CVE-2026-35041 · GCVE-0-2026-35041 NEARFORM FAST-JWT UP TO 6.2.0 JWT REDOS HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 3.0 $0-$5k 0.00+ Summaryinfo A vulnerability classified as problematic has been found in nearform fast-jwt up to 6.2.0. This vulnerability affects unknown code of the component JWT Handler. The manipulation leads to redos. This vulnerability is traded as CVE-2026-35041. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to upgrade the affected component. Detailsinfo A vulnerability was found in nearform fast-jwt up to 6.2.0. It has been rated as problematic. This issue affects some unknown processing of the component JWT Handler. The manipulation with an unknown input leads to a redos vulnerability. Using CWE to declare the problem leads to CWE-1333. The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles. Impacted is availability. The summary by CVE is: fast-jwt provides fast JSON Web Token (JWT) implementation. From 5.0.0 to 6.2.0, a denial-of-service condition exists in fast-jwt when the allowedAud verification option is configured using a regular expression. Because the aud claim is attacker-controlled and the library evaluates it against the supplied RegExp, a crafted JWT can trigger catastrophic backtracking in the JavaScript regex engine, resulting in significant CPU consumption during verification. This vulnerability is fixed in 6.2.1. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-35041 since 03/31/2026. The exploitation is known to be difficult. The attack may be initiated remotely. Additional levels of successful authentication are needed for exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1449.003 according to MITRE ATT&CK. Upgrading to version 6.2.1 eliminates this vulnerability. Productinfo Vendor nearform Name fast-jwt Version 6.0 6.1 6.2.0 Website Product: https://github.com/nearform/fast-jwt/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 3.1 VulDB Meta Temp Score: 3.0 VulDB Base Score: 2.0 VulDB Temp Score: 1.9 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 4.2 CNA Vector (GitHub_M): 🔒 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: Redos CWE: CWE-1333 / CWE-400 / CWE-404 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined 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: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: fast-jwt 6.2.1 Timelineinfo 03/31/2026 CVE reserved 04/09/2026 +9 days Advisory disclosed 04/09/2026 +0 days VulDB entry created 04/09/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Confirmed CVE: CVE-2026-35041 (🔒) GCVE (CVE): GCVE-0-2026-35041 GCVE (VulDB): GCVE-100-356579 Entryinfo Created: 04/09/2026 17:32 Changes: 04/09/2026 17:32 (64) Complete: 🔍 Cache ID: 99:D7E:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸