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CVE-2026-91403VulnerabilityPublished Updated

Bundesamt für Sicherheit in der Informationstechnik Amazon · Oracle Java SE and GraalVM, und OpenJDK: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen

Affects Bundesamt für Sicherheit in der Informationstechnik AmazonSource GCVE Database

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Authoritative record:CVE-2026-91403· Critical 9.1

Not known to be exploited · CVSS 9.1 Critical.

Data as of 29 Oct 2026, 12:04 UTC

CVSS 3.1 base score
9.1Critical
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (oracle)CVSS 3.19.1
EPSS
0.3% chance of exploitation in 30 days – higher than 31% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 21 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Oracle CorporationOracle Java SEAffected
  • 8u511 – 27.0.1
7 affected builds
Fixed in–
Oracle CorporationOracle GraalVM for JDKAffected
  • =17.0.21
  • =21.0.13
Fixed in–
Oracle CorporationOracle GraalVM Enterprise EditionAffected
  • =21.3.20
Fixed in–
Mavencom.oracle.java/java-sepkg:maven/com.oracle.java/java-seOther threatsAffected
  • 8u511 – 27.0.1
8 affected builds
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Oracle has released official patches for affected Java SE and GraalVM versions that distrust the impacted intermediate CA certificates. Users should update to the latest patched versions as listed in the Oracle advisory. Red Hat users should apply the OpenJDK 25 security update which also addresses this and related certificate handling issues. Applying these updates mitigates the vulnerability. No additional action is required beyond applying the vendor-provided patches.

Description

CVE-2026-91403 is a security vulnerability affecting Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition. The vulnerability allows bypassing security restrictions related to intermediate CA certificates from eMudhra. It can be exploited remotely without authentication via network access to the affected Java Secure Socket Extension (JSSE) component. The vulnerability impacts Java deployments that rely on sandboxing, including sandboxed Java Web Start applications and applets running untrusted code. Oracle has released patches for multiple versions to distrust the impacted intermediate CA certificates and recommends updating to the latest Java versions. Red Hat also provides updates for OpenJDK 25 to address related certificate handling issues. Exploitation could lead to high confidentiality and integrity impact but does not affect availability.

References

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