CVE-2024-22640: TCPDF version <=6.6.5 is vulnerable to ReDoS (Regular Expression Denial of Service) if parsing an untrusted HT

Q: How do I fix CVE-2024-22640?

tcpdf: upgrade to newer than 6.7.4; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2024-22640 being exploited?

CVE-2024-22640 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2024-22640 affect?

CVE-2024-22640 affects tcpdf, fedora. Severity is high (CVSS 7.5). TCPDF version <=6.6.5 is vulnerable to ReDoS (Regular Expression Denial of Service) if parsing an untrusted HTML page with a crafted color.

Q: How urgent is CVE-2024-22640?

Priority 54/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADEMITIGATE

CVE-2024-22640 is a high-severity flaw (CVSS 7.5) affecting tcpdf, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

TCPDF version <=6.6.5 is vulnerable to ReDoS (Regular Expression Denial of Service) if parsing an untrusted HTML page with a crafted color.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-1333
Published	2024-04-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: fedoraproject · tcpdf project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-04-19 16:15 UTCPublished CVE record published
2026-06-17 07:11 UTCUpdated Record last modified

tcpdf project tcpdf UPGRADE

Affected: <= 6.7.4

Fixed in: newer than 6.7.4

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 6.7.4 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade tcpdf

Note

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

fedoraproject fedora MITIGATE

Affected: 40

Fixed in: no fixed release known

Safe to downgrade to: a release before 40

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-2024-22640?

tcpdf: upgrade to newer than 6.7.4; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-22640 being exploited?

CVE-2024-22640 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-2024-22640 affect?

CVE-2024-22640 affects tcpdf, fedora. Severity is high (CVSS 7.5). TCPDF version <=6.6.5 is vulnerable to ReDoS (Regular Expression Denial of Service) if parsing an untrusted HTML page with a crafted color.

How urgent is CVE-2024-22640?

Priority 54/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-56527 HIGH 7.5 UPGRADE An issue was discovered in TCPDF before 6.8.0
CVE-2024-56522 HIGH 7.5 UPGRADE An issue was discovered in TCPDF before 6.8.0
CVE-2024-56521 CRITICAL 9.8 UPGRADE An issue was discovered in TCPDF before 6.8.0
CVE-2024-56519 HIGH 7.5 UPGRADE An issue was discovered in TCPDF before 6.8.0
CVE-2024-51058 MEDIUM 6.2 DOWNGRADE Local File Inclusion (LFI) vulnerability has been discovered in TCPDF 6.7.5

References

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