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Medium, CVSS 5.5amended

Bouncy Castle has an LDAP injection

CVE-2026-0636GHSA-c3fc-8qff-9hwx

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (org.bouncycastle:bcprov-jdk14 1.84, 1.81.1, 1.80.2; org.bouncycastle:bcprov-jdk15to18 1.84, 1.81.1, 1.80.2; org.bouncycastle:bcprov-jdk18on 1.84, 1.81.1, 1.80.2), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
5.5 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/RE:M/U:Amber · score source
EPSS
  • CVE-2026-0636: 0.53% estimated exploitation activity in the next 30 days; percentile 44.71 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Improper neutralization of special elements used in an LDAP query ('LDAP injection') vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcprov on all (prov modules). This vulnerability is associated with program files LDAPStoreHelper. Issue affecting: BC 1.74 to 1.80.1, BC 1.81, BC 1.82 to BC 1.83. Fixed versions: BC 1.80.2, BC 1.81.1, BC 1.84

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from osv record GHSA-c3fc-8qff-9hwx

  2. Revision 2 · amended ·

    Amended from ghsa record GHSA-c3fc-8qff-9hwx

  3. Revision 1 · created ·

    Published from ghsa record GHSA-c3fc-8qff-9hwx

Agent brief

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# Patch Next advisory brief: CVE-2026-0636

Advisory: Bouncy Castle has an LDAP injection
IDs: CVE-2026-0636, GHSA-c3fc-8qff-9hwx
Record: https://patchnext.com/advisories/cve-2026-0636 (revision 3, source checked 4 Nov 2026, 06:30 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.bouncycastle:bcprov-jdk14 1.84, 1.81.1, 1.80.2; org.bouncycastle:bcprov-jdk15to18 1.84, 1.81.1, 1.80.2; org.bouncycastle:bcprov-jdk18on 1.84, 1.81.1, 1.80.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.bouncycastle:bcprov-jdk14: affected >= 1.74, < 1.80.2; >= 1.81, < 1.81.1; >= 1.82, < 1.84; fixed in 1.81.1, 1.84, 1.80.2
- Maven org.bouncycastle:bcprov-jdk15to18: affected >= 1.74, < 1.80.2; >= 1.81, < 1.81.1; >= 1.82, < 1.84; fixed in 1.81.1, 1.84, 1.80.2
- Maven org.bouncycastle:bcprov-jdk18on: affected >= 1.74, < 1.80.2; >= 1.81, < 1.81.1; >= 1.82, < 1.84; fixed in 1.81.1, 1.84, 1.80.2

## Suggested inspection (read-only)
- Maven org.bouncycastle:bcprov-jdk14: check the installed version with your package manager.
- Maven org.bouncycastle:bcprov-jdk15to18: check the installed version with your package manager.
- Maven org.bouncycastle:bcprov-jdk18on: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.bouncycastle:bcprov-jdk14, org.bouncycastle:bcprov-jdk15to18, org.bouncycastle:bcprov-jdk18on.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-c3fc-8qff-9hwx (GitHub-reviewed advisory GHSA-c3fc-8qff-9hwx lists affected ranges: Maven org.bouncycastle:bcprov-jdk14 >=1.74 =1.74 =1.74 <1.84)
- Verified: https://github.com/advisories/GHSA-c3fc-8qff-9hwx (GitHub-reviewed advisory GHSA-c3fc-8qff-9hwx lists affected ranges: Maven org.bouncycastle:bcprov-jdk14 >=1.74 =1.81 =1.82 =1.74 =1.81 =1.82 =1.74 =1.81 =1.82 <1.84)
- Verified: https://osv.dev/vulnerability/GHSA-c3fc-8qff-9hwx (OSV record GHSA-c3fc-8qff-9hwx lists affected ranges: Maven org.bouncycastle:bcprov-jdk14 >=1.74 =1.81 =1.82 =1.74 =1.81 =1.82 =1.74 =1.81 =1.82 <1.84 (fixed))

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