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CVE-2026-18040VulnerabilityPublished Updated

Bundesamt für Sicherheit in der Informationstechnik IBM · Bouncy Castle für Java: Mehrere Schwachstellen

Affects Bundesamt für Sicherheit in der Informationstechnik IBMSource GCVE Database

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Authoritative record:CVE-2026-18040· Medium 5.9

Not known to be exploited · CVSS 5.9 Medium : upgrade to 1.86 when convenient.

Data as of 10 Nov 2026, 11:47 UTC

CVSS 4.0 base score
5.9Medium
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 1.86
CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/U:Amber

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.

What to do

Upgrade BC-JAVA and Legion of the Bouncy Castle Inc./bcprov to 1.86.

Affected software

ProductAffectedFixed in
Legion of the Bouncy Castle Inc.BC-JAVAAffected
  • >=1.73 <1.86
Fixed in
  • 1.86
MavenLegion of the Bouncy Castle Inc./bcprovpkg:maven/Legion of the Bouncy Castle Inc./bcprovOther threatsAffected
  • >=1.73 <1.86
Fixed in
  • 1.86

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A security update is available as part of Red Hat build of Quarkus 3.27.6 that addresses these vulnerabilities. Users should apply this official fix to remediate the issues. No additional mitigation steps are indicated by the vendor advisory.

Description

Multiple vulnerabilities have been identified in Bouncy Castle for Java, a cryptography API. The advisory references a Red Hat security update for Quarkus 3.27.6 that includes fixes for various CVEs affecting related components such as jackson-databind, jackson-core, Hibernate Validator, MongoDB Java Driver, RESTEasy, and others. These vulnerabilities include denial of service, information disclosure, path traversal, memory leaks, and cross-site scripting issues. The affected IBM product version is 10.1-10.1.0.7. No exploits in the wild are currently known.

References

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