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CVE.org (no NVD analysis yet)· CNA oracle

CVE-2026-91333: Vulnerability in Oracle Java SE (component: Security).

Noroxi assessment

Priority: Monitor (action score 14/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.26% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: java-21-openjdk (AlmaLinux:10) 1:21.0.13.0.9-1.2.el10.alma.1; java-21-openjdk-demo (AlmaLinux:10) 1:21.0.13.0.9-1.2.el10.alma.1; java-21-openjdk-demo-fastdebug (AlmaLinux:10) 1:21.0.13.0.9-1.2.el10.alma.1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to java-21-openjdk (AlmaLinux:10) 1:21.0.13.0.9-1.2.el10.alma.1; java-21-openjdk-demo (AlmaLinux:10) 1:21.0.13.0.9-1.2.el10.alma.1; java-21-openjdk-demo-fastdebug (AlmaLinux:10) 1:21.0.13.0.9-1.2.el10.alma.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Vulnerability in Oracle Java SE (component: Security). Supported versions that are affected are Oracle Java SE: 21.0.12.1, 25.0.4.1 and 27. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Java SE accessible data. 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 3.7 (Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N).

LowCVSS 3.7 · v3.1—No exploit Fix available
Published
Oct 20, 2026
Updated
Oct 28, 2026
EPSS
0.2% · 18th percentile

Report tools

JSON

Action score

14

Monitor

Low priority for now.

CVSS
14 / 40 · 3.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · oracle
3.7
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-91333

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (oracle). Independent of NVD's CPE analysis and usually ahead of it.

  • Oracle Corporation Oracle Java SE

    • 21.0.12.1, 25.0.4.1, 27affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10java-21-openjdkbefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-21-openjdk-demobefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-21-openjdk-demo-fastdebugbefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-21-openjdk-demo-slowdebugbefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-21-openjdk-develbefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-21-openjdk-devel-fastdebugbefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-21-openjdk-devel-slowdebugbefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-21-openjdk-fastdebugbefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-21-openjdk-headlessbefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-21-openjdk-headless-fastdebugbefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-21-openjdk-headless-slowdebugbefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-21-openjdk-javadocbefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-21-openjdk-javadoc-zipbefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-21-openjdk-jmodsbefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-21-openjdk-jmods-fastdebugbefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-21-openjdk-jmods-slowdebugbefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-21-openjdk-slowdebugbefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-21-openjdk-srcbefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-21-openjdk-src-fastdebugbefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-21-openjdk-src-slowdebugbefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-21-openjdk-static-libsbefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-21-openjdk-static-libs-fastdebugbefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-21-openjdk-static-libs-slowdebugbefore 1:21.0.13.0.9-1.2.el10.alma.11:21.0.13.0.9-1.2.el10.alma.1
AlmaLinux:10java-25-openjdkbefore 1:25.0.5.0.8-1.0.el10.alma.11:25.0.5.0.8-1.0.el10.alma.1

+83

Same product

oracle corporation: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-114820Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JSSE).
    36Monitor
  • CVE-2026-91403Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JSSE).
    36Monitor
  • CVE-2026-91484Vulnerability in Oracle Java SE (component: Java plugin).
    30Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-87367Oct 20, 2026 · Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JAXP).
    14Monitor
  • ← EarlierCVE-2026-91332Oct 20, 2026 · Vulnerability in Oracle Java SE (component: Networking).
    21Monitor
  • Later →CVE-2026-91334Oct 20, 2026 · Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: ImageIO
    14Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:java-25-openjdk1:25.0.5.0.8-1.0.el10.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:java-25-openjdk-crypto-adapter1:25.0.5.0.8-1.0.el10.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:java-25-openjdk-crypto-adapter-fastdebug1:25.0.5.0.8-1.0.el10.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:java-25-openjdk-crypto-adapter-slowdebug1:25.0.5.0.8-1.0.el10.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:java-25-openjdk-demo1:25.0.5.0.8-1.0.el10.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:java-25-openjdk-demo-fastdebug1:25.0.5.0.8-1.0.el10.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:java-25-openjdk-demo-slowdebug1:25.0.5.0.8-1.0.el10.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:java-25-openjdk-devel1:25.0.5.0.8-1.0.el10.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:java-25-openjdk-devel-fastdebug1:25.0.5.0.8-1.0.el10.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:java-25-openjdk-devel-slowdebug1:25.0.5.0.8-1.0.el10.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:java-25-openjdk-fastdebug1:25.0.5.0.8-1.0.el10.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:java-25-openjdk-headless1:25.0.5.0.8-1.0.el10.alma.1 · AlmaLinux:10Package registry (OSV)
debian:openjdk-2121.0.13+9-1~deb13u2 · Debian:13Package registry (OSV)
debian:openjdk-2525.0.5+8-1 · Debian:14Package registry (OSV)
debian:openjdk-2525.0.5+8-1~deb13u1 · Debian:13Package registry (OSV)
opensuse:java-21-openjdk21.0.13.0-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:java-25-openjdk25.0.5.0-1.1 · openSUSE:TumbleweedPackage registry (OSV)
rocky linux:java-25-openjdk1:25.0.5.0.8-1.0.el9_8 · Rocky Linux:9Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recorded+7 d
  3. TodayNov 3, 2026+14 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
none
Integrity
low · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-502 · Deserialization of Untrusted Data

CVSS vector

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

nvd-secondary

Root cause

Data received over the network is deserialized into the language’s native object format without verifying its source. Code paths inside the object can be triggered during deserialization.

The bug in code

The whole CWE-502 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

python
payload = sock.recv(65536)job = pickle.loads(payload)

Fixed

python
payload = sock.recv(65536)if not hmac.compare_digest(sign(payload), header_sig):    raise PermissionError("invalid signature")job = JobSchema.validate(json.loads(payload))

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓
  3. Exploit maturity— → none

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records