CVE-2026-91403CriticalNetworkRevised 26 Oct

Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JSSE). Supported versions that are affected are Oracle Java SE: 8u511, 8u511-perf, 11.0.33, 17.0.21, 21.0.13, 25.0.5, 27.0.1; Oracle GraalVM for JDK: 17.0.21 and 21.0…

MSRC advisory NVD CVE.org

Assessment

Severity: Critical
CVSS base score: 9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Impact: Not stated
EPSS, next 30 days: Not scored yet
Public exploit code: No Nuclei template lists it
Exploitability: Not assessed
Publicly disclosed: No
Customer action: Required: apply the update
Component: Mariner
Weakness: CWE-327: Use of a Broken or Risky Cryptographic Algorithm
Issued by: oracle
Published: 25 Oct 2026 · October 2026
Last revised: 26 Oct 2026Information published.

CVSS 3.1 base metricsRed raises the risk · green lowers it

Attack vector: NetworkAV:N
Attack complexity: LowAC:L
Privileges required: NonePR:N
User interaction: NoneUI:N
Scope: UnchangedS:U
Confidentiality: HighC:H
Integrity: HighI:H
Availability: NoneA:N

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

1 affected product

azl3 python-tensorboard 2.16.2-6 on Azure Linux 3.0

What changed

First observed 26 Oct 2026

No field changes are shown for this selection.

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Explore global source statements, affected packages and advisory history for CVE-2026-91403. The catalog has a separate collection scope from Microsoft release records.

cve-program · CVE-2026-91403

Published

Oracle Java SE

Vendor product

Original vendor version evidence · not evaluated as a NuGet range

{
                    "vendor": "Oracle Corporation",
                    "product": "Oracle Java SE",
                    "versions": [
                        {
                            "version": "8u511",
                            "status": "affected"
                        },
                        {
                            "version": "8u511-perf",
                            "status": "affected"
                        },
                        {
                            "version": "11.0.33",
                            "status": "affected"
                        },
                        {
                            "version": "17.0.21",
                            "status": "affected"
                        },
                        {
                            "version": "21.0.13",
                            "status": "affected"
                        },
                        {
                            "version": "25.0.5",
                            "status": "affected"
                        },
                        {
                            "version": "27.0.1",
                            "status": "affected"
                        }
                    ]
                }

Oracle GraalVM for JDK

Vendor product

Original vendor version evidence · not evaluated as a NuGet range

{
                    "vendor": "Oracle Corporation",
                    "product": "Oracle GraalVM for JDK",
                    "versions": [
                        {
                            "version": "17.0.21",
                            "status": "affected"
                        },
                        {
                            "version": "21.0.13",
                            "status": "affected"
                        }
                    ]
                }

Oracle GraalVM Enterprise Edition

Vendor product

Original vendor version evidence · not evaluated as a NuGet range

{
                    "vendor": "Oracle Corporation",
                    "product": "Oracle GraalVM Enterprise Edition",
                    "versions": [
                        {
                            "version": "21.3.20",
                            "status": "affected"
                        }
                    ]
                }