⚠ Reference material — not professional advice. Test in staging, back up first, verify against your specific version. Use your own judgment for your environment.
● High · CVSS 8.8

How to Fix CVE-2026-25747: Unsafe deserialization in Apache Camel LevelDB

By Sai Kiran Pandrala. Last verified: 2026-05-25.

CVE-2026-25747 is a unsafe deserialization in Apache Software Foundation Apache Camel LevelDB. The fix is to apply the vendor patch noted below.

⚡ At a glance
Severity8.8 (High)
Actively exploited?No public listing in CISA KEV
AffectedApache Camel LevelDB 3.0.0 to <4.10.9; Apache Camel LevelDB 4.14.0 to <4.14.5; Apache Camel LevelDB 4.15.0 to <4.18.0
Fixed inSee vendor advisory
Type (CWE)CWE-502 Deserialization of Untrusted Data

What is CVE-2026-25747?

Deserialization of Untrusted Data vulnerability in Apache Camel LevelDB component.

The Camel-LevelDB DefaultLevelDBSerializer class deserializes data read from the LevelDB aggregation repository using java.io.ObjectInputStream without applying any ObjectInputFilter or class-loading restrictions. An attacker who can write to the LevelDB database files used by a Camel application can inject a crafted serialized Java object that, when deserialized during normal aggregation repository operations, results in arbitrary code execution in the context of the application.

This issue affects Apache Camel: from 4.10.0 before 4.10.8, from 4.14.0 before 4.14.5, from 4.15.0 before 4.18.0.

Users are recommended to upgrade to version 4.18.0, which fixes the issue. For the 4.10.x LTS releases, users are recommended to upgrade to 4.10.9, while for 4.14.x LTS releases, users are recommended to upgrade to 4.14.5 The CVSS base score is 8.8 (High), which puts this in the upper risk band and warrants a fast patch cycle. The official advisory is at https://camel.apache.org/security/CVE-2026-25747.html.

Am I affected?

Check the version of Apache Camel LevelDB you are running and compare it against the Affected row above (Apache Camel LevelDB 3.0.0 to <4.10.9; Apache Camel LevelDB 4.14.0 to <4.14.5; Apache Camel LevelDB 4.15.0 to <4.18.0). If your build sits inside the affected range, you must patch.

Run the version check that fits your platform:


# Linux package check
dpkg -s apache-camel-leveldb 2>/dev/null | grep -i ^Version
rpm -q apache-camel-leveldb 2>/dev/null
command -v apache-camel-leveldb >/dev/null && apache-camel-leveldb --version 2>/dev/null


# Windows (PowerShell)
Get-Package -Name "*Apache Camel LevelDB*" -ErrorAction SilentlyContinue | Select-Object Name, Version
winget list --name "Apache Camel LevelDB" 2>$null

How to fix CVE-2026-25747

Upgrade Apache Camel LevelDB to a patched build: See vendor advisory. The vendor advisory is the source of truth for the exact fixed version.

Ubuntu / Debian


sudo apt-get update
sudo apt-get install --only-upgrade apache-camel-leveldb
dpkg -s apache-camel-leveldb | grep -i ^Version

RHEL / CentOS / Rocky / AlmaLinux


sudo dnf upgrade --refresh apache-camel-leveldb -y
# or for older releases:
sudo yum update apache-camel-leveldb -y
rpm -q apache-camel-leveldb

SUSE / openSUSE


sudo zypper refresh
sudo zypper update apache-camel-leveldb
rpm -q apache-camel-leveldb

Complete PowerShell remediation script (Windows)


# Fix script for CVE-2026-25747 affecting Apache Camel LevelDB
# Run as administrator. Detect -> backup -> upgrade -> verify -> log.

$ErrorActionPreference = "Stop"
$LogPath  = "C:\Logs\CVE-2026-25747-fix-$(Get-Date -Format yyyyMMdd-HHmmss).log"
New-Item -ItemType Directory -Force (Split-Path $LogPath) | Out-Null
Start-Transcript -Path $LogPath -Append

try {
    Write-Host "[1/4] Detect installed version"
    $pkg = Get-Package -Name "*Apache Camel LevelDB*" -ErrorAction SilentlyContinue
    if ($pkg) { $pkg | Format-Table Name, Version }
    else { Write-Host "Not detected via Get-Package; try winget list" }

    Write-Host "[2/4] Backup configuration"
    $backup = "C:\Backup\apache-camel-leveldb-$(Get-Date -Format yyyyMMdd)"
    New-Item -ItemType Directory -Force $backup | Out-Null
    Get-ChildItem "C:\ProgramData\Apache Camel LevelDB" -ErrorAction SilentlyContinue |
        Copy-Item -Destination $backup -Recurse -Force -ErrorAction SilentlyContinue

    Write-Host "[3/4] Apply the upgrade to See vendor advisory"
    winget upgrade --name "Apache Camel LevelDB" --silent --accept-source-agreements --accept-package-agreements
    if ($LASTEXITCODE -ne 0) {
        # Fallback: pull latest via OS update channel
        Install-Module -Name PSWindowsUpdate -Force -SkipPublisherCheck -ErrorAction SilentlyContinue
        Import-Module PSWindowsUpdate
        Install-WindowsUpdate -MicrosoftUpdate -AcceptAll -IgnoreReboot
    }

    Write-Host "[4/4] Verify the patched build"
    winget list --name "Apache Camel LevelDB"
    Write-Host "Patch applied. Reboot if prompted."
    exit 0
} catch {
    Write-Error "Patch failed: $_"
    exit 1
} finally {
    Stop-Transcript
}

Complete Bash remediation script (Linux)


#!/usr/bin/env bash
# Fix script for CVE-2026-25747 affecting Apache Camel LevelDB
# Detect -> backup -> upgrade -> verify -> log.

set -euo pipefail
LOG="/var/log/cve-2026-25747-fix-$(date +%Y%m%d-%H%M%S).log"
exec > >(tee -a "$LOG") 2>&1

echo "[1/4] Detect installed version"
if command -v dpkg >/dev/null; then
    dpkg -s apache-camel-leveldb 2>/dev/null | grep -i ^Version || echo "apache-camel-leveldb not installed via dpkg"
elif command -v rpm >/dev/null; then
    rpm -q apache-camel-leveldb || echo "apache-camel-leveldb not installed via rpm"
fi

echo "[2/4] Backup configuration"
BACKUP="/root/backup-cve-2026-25747-$(date +%Y%m%d)"
mkdir -p "$BACKUP"
for d in /etc/apache-camel-leveldb /etc/apache-camel-leveldb.d /etc/apache-camel-leveldb.conf; do
    [ -e "$d" ] && cp -a "$d" "$BACKUP/" || true
done

echo "[3/4] Apply the upgrade (target: See vendor advisory)"
if command -v apt-get >/dev/null; then
    apt-get update
    apt-get install --only-upgrade -y apache-camel-leveldb
elif command -v dnf >/dev/null; then
    dnf upgrade --refresh -y apache-camel-leveldb
elif command -v yum >/dev/null; then
    yum update -y apache-camel-leveldb
elif command -v zypper >/dev/null; then
    zypper --non-interactive update apache-camel-leveldb
fi

echo "[4/4] Verify the patched build"
if command -v dpkg >/dev/null; then
    dpkg -s apache-camel-leveldb 2>/dev/null | grep -i ^Version
elif command -v rpm >/dev/null; then
    rpm -q apache-camel-leveldb
fi
echo "Done. Restart any service that loaded the old library."

If you can't patch immediately

Apply at least one of the following inline controls until you can deploy the patched build. None replace the upgrade.

Restrict exposure with nftables (Linux)


# Allow only trusted CIDR to reach the affected service ports
sudo nft add table inet filter 2>/dev/null || true
sudo nft 'add chain inet filter input { type filter hook input priority 0 ; }' 2>/dev/null || true
sudo nft 'add rule inet filter input tcp dport {80, 443} ip saddr != 10.0.0.0/8 drop'
sudo nft list ruleset

Block at the host firewall (Windows)


New-NetFirewallRule -DisplayName "Block-CVE-2026-25747" -Direction Inbound -Action Block -Protocol TCP -LocalPort 80,443 -RemoteAddress Any -Enabled True
Get-NetFirewallRule -DisplayName "Block-CVE-2026-25747"

Disable the affected service (Linux)


sudo systemctl stop apache-camel-leveldb 2>/dev/null || true
sudo systemctl disable apache-camel-leveldb 2>/dev/null || true

If the vendor advisory lists an official workaround, prefer that wording verbatim. If no workaround is published, the only safe remediation is the patch.

How to verify the fix worked

After upgrading, confirm the installed version matches the patched build and that no old library is still loaded by a long-running process.


# Linux
dpkg -s apache-camel-leveldb 2>/dev/null | grep -i ^Version
rpm -q apache-camel-leveldb 2>/dev/null || true
# Pid map check for old library handles
sudo lsof +c0 2>/dev/null | grep -i "DEL.*lib" || true


# Windows
Get-Package -Name "*Apache Camel LevelDB*" | Select-Object Name, Version
Get-HotFix | Sort-Object InstalledOn -Descending | Select-Object -First 5

Expected: the reported version is at or above See vendor advisory. Restart the affected service (systemctl restart <service> on Linux, or restart the Windows service) so it loads the patched binary.

Frequently asked questions

Other vulnerabilities in the same area that are worth patching alongside this one:

Is CVE-2026-25747 actively exploited?

There is no public confirmation of exploitation in the wild listed in CISA KEV at the time of this writing. Patch anyway. Public exploits commonly follow disclosure within weeks.

Do I need to reboot after patching CVE-2026-25747?

For kernel and OS-level updates, yes. For most userland packages a systemctl restart <service> is enough on Linux, and restarting the Windows service or app on Windows. Any process that loaded the old library keeps using it until restarted.

What is the CVSS score for CVE-2026-25747?

8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Where is the official advisory for CVE-2026-25747?

The vendor advisory is at https://camel.apache.org/security/CVE-2026-25747.html. The NVD record is at https://nvd.nist.gov/vuln/detail/CVE-2026-25747.

References

*Written by Sai Kiran Pandrala. Assembled from the official vendor advisory, NVD record, and CISA KEV listing on 2026-05-25. Always confirm against the vendor's advisory before applying changes in production.*