CVE-2004-1019: The deserialization code in PHP before 4.3.10 and PHP 5.x up to 5.0.2 allows remote attackers to cause a denia

This week

HIGH 10.0WATCHLISTDOWNGRADEDOWNGRADEMITIGATE

CVE-2004-1019 is a high-severity flaw (CVSS 10.0) affecting openpkg, php, secure linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The deserialization code in PHP before 4.3.10 and PHP 5.x up to 5.0.2 allows remote attackers to cause a denial of service and execute arbitrary code via untrusted data to the unserialize function that may trigger "information disclosure, double-free and negative reference index array underflow" results.

Why this priority

Critical severity
EPSS top 5%: very likely to be exploited
On your watchlist

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	8.0% (top 5%)
CISA exploited list	No
Weakness	CWE-20
Published	2005-01-10
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: openpkg · php · trustix · ubuntu

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2005-01-10 05:00 UTCPublished CVE record published
2026-06-16 22:06 UTCUpdated Record last modified

openpkg openpkg DOWNGRADE

Affected: 2.1 · 2.2 · current

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.1 (Debian / Ubuntu)

apt-cache madison openpkg sudo apt install openpkg=<VERSION_BEFORE_2.1> sudo apt-mark hold openpkg

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list openpkg sudo dnf downgrade openpkg-<VERSION_BEFORE_2.1> sudo dnf versionlock add openpkg

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.

php php DOWNGRADE

Affected: 3.0 · 3.0.1 · 3.0.2 · 3.0.3 · 3.0.4 · 3.0.5 · 3.0.6 · 3.0.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.0 (Debian / Ubuntu)

apt-cache madison php sudo apt install php=<VERSION_BEFORE_3.0> sudo apt-mark hold php

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list php sudo dnf downgrade php-<VERSION_BEFORE_3.0> sudo dnf versionlock add php

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.

trustix secure linux MITIGATE

Affected: 2.0 · 2.1 · 2.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

ubuntu ubuntu linux MITIGATE

Affected: 4.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.1

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2004-1019?

openpkg: downgrade or apply the listed mitigation; php: downgrade or apply the listed mitigation; secure linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-1019 being exploited?

CVE-2004-1019 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-2004-1019 affect?

CVE-2004-1019 affects openpkg, php, secure linux. Severity is high (CVSS 10.0). The deserialization code in PHP before 4.3.10 and PHP 5.x up to 5.0.2 allows remote attackers to cause a denial of service and execute arbitrary code via untrusted data to the unserialize function that may trigger "information disclosure, d

How urgent is CVE-2004-1019?

Priority 64/100. Critical severity; EPSS top 5%: very likely to be exploited; On your watchlist

Software pages

PHP vulnerabilities · Ubuntu vulnerabilities

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References

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