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CVE-2026-4603

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:779b8d2ef0a42515bbb81aa5452dfe2ae159c9820bfca3cf762b32998cf10ed0
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"LOW","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","exploitCodeMaturity":"PROOF_OF_CONCEPT","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:0d7e79e7783bf0cf67e7d1f96ed4b395ca23717c38c74907df70e56afb8c582d · sha256:13e4e84f6f011ab7… · /containers/cna/metrics/0/cvssV3_1

{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"LOCAL","baseScore":5.1,"baseSeverity":"MEDIUM","exploitMaturity":"PROOF_OF_CONCEPT","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"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","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:0d7e79e7783bf0cf67e7d1f96ed4b395ca23717c38c74907df70e56afb8c582d · sha256:13e4e84f6f011ab7… · /containers/cna/metrics/0/cvssV4_0

Affected products and versions

1 source assertion
{"product":"jsrsasign","vendor":"n/a","versions":[{"lessThan":"11.1.1","status":"affected","version":"0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0d7e79e7783bf0cf67e7d1f96ed4b395ca23717c38c74907df70e56afb8c582d · sha256:13e4e84f6f011ab7… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"LOW","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","exploitCodeMaturity":"PROOF_OF_CONCEPT","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:0d7e79e7783bf0cf67e7d1f96ed4b395ca23717c38c74907df70e56afb8c582d · sha256:13e4e84f6f011ab7… · /containers/cna/metrics/0/cvssV3_1
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"LOCAL","baseScore":5.1,"baseSeverity":"MEDIUM","exploitMaturity":"PROOF_OF_CONCEPT","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"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","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:0d7e79e7783bf0cf67e7d1f96ed4b395ca23717c38c74907df70e56afb8c582d · sha256:13e4e84f6f011ab7… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-369","description":"Division by zero","lang":"en"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:0d7e79e7783bf0cf67e7d1f96ed4b395ca23717c38c74907df70e56afb8c582d · sha256:13e4e84f6f011ab7… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"url":"https://gist.github.com/Kr0emer/5366b7364c4fbf7e754bc377f321e9f3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0d7e79e7783bf0cf67e7d1f96ed4b395ca23717c38c74907df70e56afb8c582d · sha256:13e4e84f6f011ab7… · /containers/cna/references/1
{"url":"https://github.com/kjur/jsrsasign/commit/dc41d49fac4297e7a737a3ef8ebd0aa9c49ef93f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0d7e79e7783bf0cf67e7d1f96ed4b395ca23717c38c74907df70e56afb8c582d · sha256:13e4e84f6f011ab7… · /containers/cna/references/2
{"url":"https://github.com/kjur/jsrsasign/pull/649"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0d7e79e7783bf0cf67e7d1f96ed4b395ca23717c38c74907df70e56afb8c582d · sha256:13e4e84f6f011ab7… · /containers/cna/references/3
{"url":"https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371176"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0d7e79e7783bf0cf67e7d1f96ed4b395ca23717c38c74907df70e56afb8c582d · sha256:13e4e84f6f011ab7… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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