CVE-2026-64606: Deserialization of untrusted data vulnerability that may allow class-registration checks to be bypassed during

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CRITICAL 9.8REMOTEWATCHLISTUPGRADE

CVE-2026-64606 is a critical-severity flaw (CVSS 9.8) affecting fory. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Deserialization of untrusted data vulnerability that may allow class-registration checks to be bypassed during Java lambda deserialization. Only lambda capture class is affected This issue affects Apache Fory: from before 1.4.0. Users are recommended to upgrade to version 1.4.0, which fixes the issue.

Why this priority

Critical severity
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 44%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-07-21
Last modified	2026-10-24

Publisher (CNA): Apache Software Foundation · Vendor: apache

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

Am I affected?

Timeline

2026-07-21 11:16 UTCPublished CVE record published
2026-10-24 20:10 UTCUpdated Record last modified

apache fory UPGRADE

Affected: >= 0.5.0 and < 1.4.0

Fixed in: 1.4.0

Safe to downgrade to: a release before 0.5.0

1. Check installed version

apt-cache policy fory || rpm -q fory || fory --version

2. UPGRADE to 1.4.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fory

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fory

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.5.0 (Debian / Ubuntu)

apt-cache madison fory sudo apt install fory=<VERSION_BEFORE_0.5.0> sudo apt-mark hold fory

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list fory sudo dnf downgrade fory-<VERSION_BEFORE_0.5.0> sudo dnf versionlock add fory

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.

Exact fixes by distribution

Fedora 46 · conda · FIXED · 26.9.4-2.fc46 · FEDORA-2026-09931756f1 · source

sudo dnf upgrade --advisory=FEDORA-2026-09931756f1

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-2026-64606?

fory: upgrade to 1.4.0. Exact commands for each OS are on this page.

Is CVE-2026-64606 being exploited?

CVE-2026-64606 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-2026-64606 affect?

CVE-2026-64606 affects fory. Severity is critical (CVSS 9.8). Deserialization of untrusted data vulnerability that may allow class-registration checks to be bypassed during Java lambda deserialization. Only lambda capture class is affected This issue affects Apache Fory: from before 1.4.0. Users ar

How urgent is CVE-2026-64606?

Priority 61/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Java vulnerabilities

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References

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