{"answers":{"affected":"2 open source packages ship an affected version, including jsrsasign. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-4603 in the wild and no public exploit code.","fix":"Upgrade jsrsasign to 11.1.1 or later.","what":"CVE-2026-4603 is a medium-severity denial of service vulnerability in jsrsasign, published on 23 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-4603 and fix it if it is affected.\n\nWhat it is: CVE-2026-4603 is a medium-severity denial of service vulnerability in jsrsasign, published on 23 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-4603 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- jsrsasign (npm): affected all versions; fixed in 11.1.1\n- jsrsasign (npm): affected all versions; fixed in 11.1.1\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-4603/ (Markdown: https://insights.sbomify.com/CVE-2026-4603/index.md)","id":"CVE-2026-4603","markdown":"https://insights.sbomify.com/CVE-2026-4603/index.md","name":"CVE-2026-4603","record":{"aliases":["GHSA-464q-cqxq-xhgr"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service","security_bypass"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"JavaScript cryptography library","requires_auth":"none","summary":"An attacker can cause denial of service and bypass security checks in jsrsasign by supplying a crafted JWK with a zero modulus.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"snyk","cpe":[{"product":"jsrsasign","vendor":"kjur"}],"cvss":{"score":5.1,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P","version":"4.0"},"cwes":[{"id":"CWE-369","name":"Divide By Zero"}],"description":"Versions of the package jsrsasign before 11.1.1 are vulnerable to Division by zero due to the RSASetPublic/KEYUTIL parsing path in ext/rsa.js and the BigInteger.modPowInt reduction logic in ext/jsbn.js. An attacker can force RSA public-key operations (e.g., verify and encryption) to collapse to deterministic zero outputs and hide “invalid key” errors by supplying a JWK whose modulus decodes to zero.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"jsrsasign: Division by Zero Allows Invalid JWK Modulus to Cause Deterministic Zero Output in RSA Operations","id":"CVE-2026-4603","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":2,"n_references":4,"next":{"headline":"Klubraum Membership Request \u003c= 1.1.0 - Missing Authorization to Unauthenticated Arbitrary Plugin Settings Update","id":"CVE-2026-4604"},"packages":[{"ecosystem":"npm","fixed":["11.1.1"],"introduced":["0"],"last_affected":[],"package":"jsrsasign","purl":null,"source":"GHSA-464q-cqxq-xhgr"},{"ecosystem":"npm","fixed":["11.1.1"],"introduced":["0"],"last_affected":[],"package":"jsrsasign","purl":"pkg:npm/jsrsasign","source":"GHSA-464q-cqxq-xhgr"}],"prev":{"headline":"jsrsasign: Negative Exponent Handling Leads to Signature Verification Bypass","id":"CVE-2026-4602"},"products":["jsrsasign"],"published":"2026-03-23","related":[{"cvss_score":9.8,"headline":"RSA PKCS#1 decryption vulnerability with prepending zeros in jsrsasign","id":"CVE-2020-14967","kev_date_added":null,"published":"2020-06-22"},{"cvss_score":9.8,"headline":"RSA-PSS signature validation vulnerability by prepending zeros in jsrsasign","id":"CVE-2020-14968","kev_date_added":null,"published":"2020-06-22"},{"cvss_score":9.4,"headline":"jsrsasign: Missing cryptographic validation during DSA signing enables private key extraction","id":"CVE-2026-4601","kev_date_added":null,"published":"2026-03-23"},{"cvss_score":9.3,"headline":"jsrsasign: Incomplete Comparison Allows DSA Private Key Recovery via Biased Nonce Generation","id":"CVE-2026-4599","kev_date_added":null,"published":"2026-03-23"},{"cvss_score":9.1,"headline":"jsrsasign: DSA signatures or X.509 certificates can be forged via DSA domain-parameter validation in KJUR.crypto.DSA.setPublic","id":"CVE-2026-4600","kev_date_added":null,"published":"2026-03-23"},{"cvss_score":9.1,"headline":"RSA signature validation vulnerability on maleable encoded message in jsrsasign","id":"CVE-2021-30246","kev_date_added":null,"published":"2021-04-07"},{"cvss_score":8.7,"headline":"jsrsasign is vulnerable to DoS through Infinite Loop when processing zero or negative inputs","id":"CVE-2026-4598","kev_date_added":null,"published":"2026-03-23"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-03-23","vendors":["n/a"]},"summary":"An attacker can cause denial of service and bypass security checks in jsrsasign by supplying a crafted JWK with a zero modulus.","url":"https://insights.sbomify.com/CVE-2026-4603/"}