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CVE-2026-47027: Vulnerability in Oracle Java SE (component: Libraries)

29
Routine
MEDIUM 5.3REMOTEDOWNGRADEDOWNGRADEDOWNGRADE

CVE-2026-47027 is a medium-severity flaw (CVSS 5.3) affecting graalvm, graalvm for jdk, jre. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Vulnerability in Oracle Java SE (component: Libraries). Supported versions that are affected are Oracle Java SE: 8u491, 8u491-perf, 11.0.31, 17.0.19, 21.0.11, 25.0.3, 26.0.1; Oracle GraalVM for JDK: 17.0.19 and 21.0.11; Oracle GraalVM Enterprise Edition: 21.3.18. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE. Successful attacks of this vulnerability can

Why this priority

  • Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score5.3 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.3% (top 80%)
CISA exploited listNo
WeaknessCWE-284
Published2026-07-21
Last modified2026-10-24
Publisher (CNA): Oracle · Vendor: oracle

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Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

oracle graalvm DOWNGRADE
Affected: 21.3.18
Fixed in: no fixed release known
Safe to downgrade to: a release before 21.3.18
1. Check installed version
apt-cache policy graalvm || rpm -q graalvm || graalvm --version
2. No fixed release: DOWNGRADE to a release before 21.3.18 (Debian / Ubuntu)
apt-cache madison graalvm sudo apt install graalvm=<VERSION_BEFORE_21.3.18> sudo apt-mark hold graalvm
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list graalvm sudo dnf downgrade graalvm-<VERSION_BEFORE_21.3.18> sudo dnf versionlock add graalvm
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
oracle graalvm for jdk DOWNGRADE
Affected: 17.0.19 · 21.0.11
Fixed in: no fixed release known
Safe to downgrade to: a release before 17.0.19
1. Check installed version
apt-cache policy graalvm-for-jdk || rpm -q graalvm-for-jdk || graalvm-for-jdk --version
2. No fixed release: DOWNGRADE to a release before 17.0.19 (Debian / Ubuntu)
apt-cache madison graalvm-for-jdk sudo apt install graalvm-for-jdk=<VERSION_BEFORE_17.0.19> sudo apt-mark hold graalvm-for-jdk
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list graalvm-for-jdk sudo dnf downgrade graalvm-for-jdk-<VERSION_BEFORE_17.0.19> sudo dnf versionlock add graalvm-for-jdk
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
oracle jre DOWNGRADE
Affected: 1.8.0 update491 · 11.0.31 · 17.0.19 · 21.0.11 · 25.0.3 · 26.0.1
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.8.0
1. Check installed version
apt-cache policy jre || rpm -q jre || jre --version
2. No fixed release: DOWNGRADE to a release before 1.8.0 (Debian / Ubuntu)
apt-cache madison jre sudo apt install jre=<VERSION_BEFORE_1.8.0> sudo apt-mark hold jre
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list jre sudo dnf downgrade jre-<VERSION_BEFORE_1.8.0> sudo dnf versionlock add jre
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
oracle jdk DOWNGRADE
Affected: 1.8.0 update491 · 11.0.31 · 17.0.19 · 21.0.11 · 25.0.3 · 26.0.1
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.8.0
1. Check installed version
apt-cache policy jdk || rpm -q jdk || jdk --version
2. No fixed release: DOWNGRADE to a release before 1.8.0 (Debian / Ubuntu)
apt-cache madison jdk sudo apt install jdk=<VERSION_BEFORE_1.8.0> sudo apt-mark hold jdk
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list jdk sudo dnf downgrade jdk-<VERSION_BEFORE_1.8.0> sudo dnf versionlock add jdk
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-47027?

graalvm: downgrade or apply the listed mitigation; graalvm for jdk: downgrade or apply the listed mitigation; jre: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-47027 being exploited?

CVE-2026-47027 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-47027 affect?

CVE-2026-47027 affects graalvm, graalvm for jdk, jre. Severity is medium (CVSS 5.3). Vulnerability in Oracle Java SE (component: Libraries). Supported versions that are affected are Oracle Java SE: 8u491, 8u491-perf, 11.0.31, 17.0.19, 21.0.11, 25.0.3, 26.0.1; Oracle GraalVM for JDK: 17.0.19 and 21.0.11; Oracle GraalVM Ent

How urgent is CVE-2026-47027?

Priority 29/100. Remotely exploitable, no login, no user action

Software pages

Java vulnerabilities

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References

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