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CVE Record

CVE-2026-0636: LDAP Injection Vulnerability in LDAPStoreHelper.java

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. This issue affects BC-JAVA: from 1.74 before 1.80.2, from 1.81 before 1.81.1, from 1.82 before 1.84.

MediumCVSS 6.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

BC-JAVA can build unsafe LDAP queries when applications pass untrusted data through LDAPStoreHelper. An unauthenticated remote attacker may manipulate directory searches, potentially exposing or altering limited information. Impact depends on whether the application uses the vulnerable helper with attacker-controlled input.

Executive priority

Treat as a targeted, moderate-priority remediation. Prioritize internet-facing or identity-sensitive applications using LDAPStoreHelper, then upgrade within the normal security patch cycle. Escalate urgency if validation confirms unauthenticated input reaches the vulnerable query path.

Technical view

CVE-2026-0636 is a CWE-90 LDAP injection flaw in BC-JAVA bcprov's LDAPStoreHelper.java. It affects versions 1.74 through 1.80.1, 1.81, and 1.82 through 1.83. CVSS 3.1 is 6.5: network-reachable, low complexity, no privileges or interaction, with low confidentiality and integrity impact and no availability impact.

Likely exposure

Exposure requires a vulnerable bcprov version and an application path where attacker-controlled values reach LDAPStoreHelper query construction. Merely having BC-JAVA installed does not establish exploitability. Internet-facing services, APIs, or identity workflows using this helper deserve prompt review.

Exploitation context

The CVSS vector describes remote, unauthenticated, low-complexity exploitation without user interaction. However, the source bundle marks KEV false and provides no evidence of active exploitation. Practical impact remains application-dependent because untrusted input must reach the affected LDAP query logic.

Researcher notes

The vendor identifies LDAPStoreHelper as the affected program file and provides a patch commit. The supplied evidence establishes affected and fixed version ranges, but does not document observed attacks or prove every bcprov consumer is reachable. Deployment-specific data flow analysis is therefore essential.

Mitigation direction

  • Upgrade 1.74–1.80.1 deployments to BC-JAVA 1.80.2 or later.
  • Upgrade version 1.81 to BC-JAVA 1.81.1 or later.
  • Upgrade 1.82–1.83 deployments to BC-JAVA 1.84 or later.
  • Apply the relevant Red Hat security erratum when using affected Red Hat packages.
  • Restrict untrusted input from LDAP query construction until upgrades are completed.

Validation and detection

  • Inventory direct and transitive bcprov dependencies, including versions packaged inside deployed applications.
  • Confirm runtime artifacts do not contain affected BC-JAVA versions.
  • Search application code and dependency usage for LDAPStoreHelper.java or its exposed APIs.
  • Trace whether externally controlled values can reach affected LDAP query construction.
  • After upgrading, test that special LDAP characters cannot change the intended query structure.
Prepared
Confidence
high
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-90: Database access and collection lookup

Injection into data stores can inform collection, data access, and exfiltration detection reviews. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2026-0636 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
5Timeline events
2ADP providers
18Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: partial

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
6.5CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N3.92.5redhat-SADP
5.5CVSS 4.0MediumCVSS: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/S:N/AU:Y/R:A/RE:M/U:Amber——bcorg

Vulnerability scoring details

Base CVSS 4.0 score

5.5Medium
CVSS 4.0 vector shape for CVE-2026-0636Attack VectorAttack ComplexityAttack RequirementsPrivileges RequiredUser InteractionVS ConfidentialityVS IntegrityVS AvailabilitySS ConfidentialitySS IntegritySS Availability

Vector: 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/S:N/AU:Y/R:A/RE:M/U:Amber

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Attack Requirements
NonePresent
Privileges Required
NoneLowHigh
User Interaction
NonePassiveActive
VS Confidentiality
HighLowNone
VS Integrity
HighLowNone
VS Availability
HighLowNone
SS Confidentiality
HighLowNone
SS Integrity
HighLowNone
SS Availability
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Reported to Red Hat.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPbouncycastle: BC-JAVA: LDAP injection vulnerability in LDAPStoreHelper.java
other:Red Hat severity ratingcvssV3_1
  • 2026-04-15T10:01:32.911Z: Reported to Red Hat.
  • 2026-04-15T08:59:12.677Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Legion of the Bouncy Castle Inc.BC-JAVAbcprov, 1.74, 1.81, 1.82unaffected
Weakness

CWE details

CWE-90

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-90 · source CWE mapping

Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')

Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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