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CVE Record

CVE-2026-34282: Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of O...

Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Networking). Supported versions that are affected are Oracle Java SE: 8u481-perf, 11.0.30, 17.0.18, 21.0.10, 25.0.2, 26; Oracle GraalVM for JDK: 17.0.18 and 21.0.10; Oracle GraalVM Enterprise Edition: 21.3.17. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Note: This vulnerability can be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs. This vulnerability also applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This is a high-severity denial-of-service issue in Oracle Java and GraalVM networking. An unauthenticated network attacker may cause affected Java runtimes or applications using the vulnerable APIs to hang or crash repeatedly. The reported impact is availability only, not data theft or code execution.

Executive priority

Prioritize remediation for production and internet-facing Java workloads. The business risk is service outage, not confirmed data compromise. Because the vulnerability needs no authentication and can cause complete denial of service, patch planning should be prompt but scoped to affected Java and GraalVM versions.

Technical view

CVE-2026-34282 affects Oracle Java SE, GraalVM for JDK, and GraalVM Enterprise Edition networking components. Oracle rates it CVSS 7.5 with network attack vector, low complexity, no privileges, no user interaction, and high availability impact. Listed weaknesses include resource consumption and potential infinite-loop behavior.

Likely exposure

Exposure is most likely where affected Java or GraalVM versions process untrusted network-supplied data through Java networking APIs, including web services. Legacy sandboxed Java Web Start or applet deployments relying on the Java sandbox are also noted by Oracle.

Exploitation context

The bundle says the flaw is easily exploitable over multiple protocols without authentication. It does not show KEV listing or cited evidence of active exploitation. Treat internet-facing Java services as higher priority because successful exploitation can cause complete denial of service.

Researcher notes

The source bundle does not provide exploit details, fixed version numbers, or active exploitation evidence. Oracle’s note about APIs suggests vulnerable behavior may be reachable indirectly through applications that feed attacker-controlled data into Java networking functionality.

Mitigation direction

  • Apply Oracle CPU guidance for affected Java and GraalVM versions.
  • Use applicable Red Hat RHSA advisories for packaged OpenJDK updates.
  • Prioritize internet-facing services using Java networking APIs with untrusted input.
  • Reduce exposure to untrusted network data where patching is delayed.
  • Retire or isolate legacy Java Web Start and applet use.

Validation and detection

  • Inventory Java SE and GraalVM versions against the affected version list.
  • Map web services that pass untrusted data into Java networking APIs.
  • Check Red Hat CSAF/VEX and RHSA entries for package applicability.
  • Review monitoring for repeatable Java hangs, crashes, or service restarts.
  • Confirm whether any sandboxed Java Web Start or applet deployments remain.
Prepared
Confidence
high
Sources
10

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 · low confidence lookup

CWE-400: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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.

Open ATT&CK lookup
cwe · low confidence lookup

CWE-835: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-34282 mapping review

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

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

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

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
20Source 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
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6oracle
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2026-34282Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
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

    Reported to Red Hat.

  3. ADP timelineredhat-SADP

    Made public.

  4. CVE publishedCVE Program

    The CVE record was published.

  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-SADPopenjdk: Enhance TLS connection handling (Oracle CPU 2026-04)
other:Red Hat severity ratingcvssV3_1
  • 2026-04-21T00:00:00.000Z: Reported to Red Hat.
  • 2026-04-21T20:00:00.000Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Oracle CorporationOracle Java SE8u481-perf, 11.0.30, 17.0.18, 21.0.10, 25.0.2, 26Listed
Oracle CorporationOracle GraalVM for JDK17.0.18, 21.0.10Listed
Oracle CorporationOracle GraalVM Enterprise Edition21.3.17Listed
Weakness

CWE details

CWE-400CWE-835

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

CWE-400 · source CWE mapping

Uncontrolled Resource Consumption

Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs
CWE-835 · source CWE mapping

Loop with Unreachable Exit Condition ('Infinite Loop')

Loop with Unreachable Exit Condition ('Infinite Loop') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs