Baitaphish
Security intelligence
SearchLatest briefing
CVE Explorer

CVE-2026-59639

In Bouncy Castle for Java before 1.85, CMS verifySignatures returns true for SignedData with zero signers. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.12 (1.0.X series), 2.0.12 (2.0.X series) and 2.1.12 (2.1.X series).
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:8633ff38ae67ce114f543bcd8f783709c3affd19ce4576b29db6ab8b4b5db79d
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 3 assertions

{"collectionURL":"https://www.bouncycastle.org/download/bouncy-castle-java/","defaultStatus":"unaffected","modules":["pkix"],"packageName":"bcpkix","packageURL":"pkg:maven/org.bouncycastle/bcpkix-jdk18on","platforms":["all"],"product":"BC-JAVA","programFiles":["CMSSignedData"],"repo":"https://github.com/bcgit/bc-java","vendor":"Legion of the Bouncy Castle Inc.","versions":[{"lessThan":"1.85","status":"affected","version":"0","versionType":"maven"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5edeba2c79596e7180aff1df8bca169982c5bde8bdd0ed9ad60a40ab27f43ce0 · sha256:f84bc10048224a77… · /containers/cna/affected/0

{"collectionURL":"https://www.bouncycastle.org/download/bouncy-castle-java-fips/","defaultStatus":"unaffected","packageName":"bcpkix-fips","packageURL":"pkg:maven/org.bouncycastle/bcpkix-fips","platforms":["all"],"product":"BC-FJA","vendor":"Legion of the Bouncy Castle Inc.","versions":[{"lessThan":"1.0.12","status":"affected","version":"1.0.0","versionType":"maven"},{"lessThan":"2.0.12","status":"affected","version":"2.0.0","versionType":"maven"},{"lessThan":"2.1.12","status":"affected","version":"2.1.0","versionType":"maven"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5edeba2c79596e7180aff1df8bca169982c5bde8bdd0ed9ad60a40ab27f43ce0 · sha256:f84bc10048224a77… · /containers/cna/affected/2

{"collectionURL":"https://www.bouncycastle.org/download/bouncy-castle-java-lts/","defaultStatus":"unaffected","modules":["pkix"],"packageName":"bcpkix-lts8on","packageURL":"pkg:maven/org.bouncycastle/bcpkix-lts8on","platforms":["all"],"product":"BC-LTS-JAVA","programFiles":["CMSSignedData"],"repo":"https://github.com/bcgit/bc-lts-java","vendor":"Legion of the Bouncy Castle Inc.","versions":[{"lessThan":"2.73.12","status":"affected","version":"2.73.0","versionType":"maven"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5edeba2c79596e7180aff1df8bca169982c5bde8bdd0ed9ad60a40ab27f43ce0 · sha256:f84bc10048224a77… · /containers/cna/affected/1

Affected products and versions

3 source assertions
{"collectionURL":"https://www.bouncycastle.org/download/bouncy-castle-java/","defaultStatus":"unaffected","modules":["pkix"],"packageName":"bcpkix","packageURL":"pkg:maven/org.bouncycastle/bcpkix-jdk18on","platforms":["all"],"product":"BC-JAVA","programFiles":["CMSSignedData"],"repo":"https://github.com/bcgit/bc-java","vendor":"Legion of the Bouncy Castle Inc.","versions":[{"lessThan":"1.85","status":"affected","version":"0","versionType":"maven"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5edeba2c79596e7180aff1df8bca169982c5bde8bdd0ed9ad60a40ab27f43ce0 · sha256:f84bc10048224a77… · /containers/cna/affected/0
{"collectionURL":"https://www.bouncycastle.org/download/bouncy-castle-java-fips/","defaultStatus":"unaffected","packageName":"bcpkix-fips","packageURL":"pkg:maven/org.bouncycastle/bcpkix-fips","platforms":["all"],"product":"BC-FJA","vendor":"Legion of the Bouncy Castle Inc.","versions":[{"lessThan":"1.0.12","status":"affected","version":"1.0.0","versionType":"maven"},{"lessThan":"2.0.12","status":"affected","version":"2.0.0","versionType":"maven"},{"lessThan":"2.1.12","status":"affected","version":"2.1.0","versionType":"maven"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5edeba2c79596e7180aff1df8bca169982c5bde8bdd0ed9ad60a40ab27f43ce0 · sha256:f84bc10048224a77… · /containers/cna/affected/2
{"collectionURL":"https://www.bouncycastle.org/download/bouncy-castle-java-lts/","defaultStatus":"unaffected","modules":["pkix"],"packageName":"bcpkix-lts8on","packageURL":"pkg:maven/org.bouncycastle/bcpkix-lts8on","platforms":["all"],"product":"BC-LTS-JAVA","programFiles":["CMSSignedData"],"repo":"https://github.com/bcgit/bc-lts-java","vendor":"Legion of the Bouncy Castle Inc.","versions":[{"lessThan":"2.73.12","status":"affected","version":"2.73.0","versionType":"maven"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5edeba2c79596e7180aff1df8bca169982c5bde8bdd0ed9ad60a40ab27f43ce0 · sha256:f84bc10048224a77… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"AMBER","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/U:Amber","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact"…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5edeba2c79596e7180aff1df8bca169982c5bde8bdd0ed9ad60a40ab27f43ce0 · sha256:f84bc10048224a77… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-347","description":"CWE-347 Improper Verification of Cryptographic Signature","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5edeba2c79596e7180aff1df8bca169982c5bde8bdd0ed9ad60a40ab27f43ce0 · sha256:f84bc10048224a77… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"tags":["patch"],"url":"https://github.com/bcgit/bc-java/commit/99ddc6dcc6782e6a76b0dd587c77e62eb7096ad0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5edeba2c79596e7180aff1df8bca169982c5bde8bdd0ed9ad60a40ab27f43ce0 · sha256:f84bc10048224a77… · /containers/cna/references/1
{"tags":["vendor-advisory"],"url":"https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059639"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5edeba2c79596e7180aff1df8bca169982c5bde8bdd0ed9ad60a40ab27f43ce0 · sha256:f84bc10048224a77… · /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.

← Back to CVE Explorer