CVE-2026-4601 | jsrsasign up to 11.1.0 Private Key KJUR.crypto.DSA.signWithMessageHash missing cryptographic step (SNYK-JS-JSRSASIGN-15370941)

VDB-352490 · CVE-2026-4601 · GCVE-0-2026-4601 JSRSASIGN UP TO 11.1.0 PRIVATE KEY KJUR.CRYPTO.DSA.SIGNWITHMESSAGEHASH MISSING CRYPTOGRAPHIC STEP HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.0 $0-$5k 2.88+ Summaryinfo A vulnerability described as problematic has been identified in jsrsasign up to 11.1.0. The affected element is the function KJUR.crypto.DSA.signWithMessageHash of the component Private Key Handler. Such manipulation leads to missing cryptographic step. This vulnerability is referenced as CVE-2026-4601. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended. Detailsinfo A vulnerability was found in jsrsasign up to 11.1.0 and classified as problematic. Affected by this issue is the function KJUR.crypto.DSA.signWithMessageHash of the component Private Key Handler. The manipulation with an unknown input leads to a missing cryptographic step vulnerability. Using CWE to declare the problem leads to CWE-325. The product does not implement a required step in a cryptographic algorithm, resulting in weaker encryption than advertised by the algorithm. Impacted is confidentiality, integrity, and availability. CVE summarizes: Versions of the package jsrsasign before 11.1.1 are vulnerable to Missing Cryptographic Step via the KJUR.crypto.DSA.signWithMessageHash process in the DSA signing implementation. An attacker can recover the private key by forcing r or s to be zero, so the library emits an invalid signature without retrying, and then solves for x from the resulting signature. The advisory is available at security.snyk.io. This vulnerability is handled as CVE-2026-4601 since 03/22/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1600 by the MITRE ATT&CK project. It is declared as proof-of-concept. Upgrading to version 11.1.1 eliminates this vulnerability. Productinfo Name jsrsasign Version 11.0 11.1.0 CPE 2.3info 🔒 🔒 CPE 2.2info 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 7.1 VulDB Meta Temp Score: 7.0 VulDB Base Score: 5.6 VulDB Temp Score: 5.4 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 8.7 CNA Vector (snyk): 🔒 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: Missing cryptographic step CWE: CWE-325 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Proof-of-Concept 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: jsrsasign 11.1.1 Timelineinfo 03/22/2026 CVE reserved 03/23/2026 +1 days Advisory disclosed 03/23/2026 +0 days VulDB entry created 03/23/2026 +0 days VulDB entry last update Sourcesinfo Advisory: SNYK-JS-JSRSASIGN-15370941 Status: Confirmed CVE: CVE-2026-4601 (🔒) GCVE (CVE): GCVE-0-2026-4601 GCVE (VulDB): GCVE-100-352490 Entryinfo Created: 03/23/2026 07:19 Changes: 03/23/2026 07:19 (77) Complete: 🔍 Cache ID: 99:AD1:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸