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CVE-2021-40326: Foxit PDF Reader before 11.1 and PDF Editor before 11.1, and PhantomPDF before 10.1.6, mishandle hidden and in

24
Routine
MEDIUM 5.5UPGRADEUPGRADEUPGRADE

CVE-2021-40326 is a medium-severity flaw (CVSS 5.5) affecting pdf editor, pdf reader, phantompdf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Foxit PDF Reader before 11.1 and PDF Editor before 11.1, and PhantomPDF before 10.1.6, mishandle hidden and incremental data in signed documents. An attacker can write to an arbitrary file, and display controlled contents, during signature verification.

Why this priority

  • No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score5.5 (Medium)
Attack vectorLocal
Attack complexityLow
Privileges neededNone
User interactionRequired
EPSS exploit chance0.3% (top 79%)
CISA exploited listNo
WeaknessCWE-347
Published2022-08-29
Last modified2026-06-17
Publisher (CNA): MITRE · Vendor: foxit

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

Am I affected?

Timeline

foxit pdf editor UPGRADE
Affected: >= 11.0 and < 11.1
Fixed in: 11.1
Safe to downgrade to: a release before 11.0
1. Check installed version
apt-cache policy pdf-editor || rpm -q pdf-editor || pdf-editor --version
2. UPGRADE to 11.1 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade pdf-editor
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade pdf-editor
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 11.0 (Debian / Ubuntu)
apt-cache madison pdf-editor sudo apt install pdf-editor=<VERSION_BEFORE_11.0> sudo apt-mark hold pdf-editor
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list pdf-editor sudo dnf downgrade pdf-editor-<VERSION_BEFORE_11.0> sudo dnf versionlock add pdf-editor
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.
foxit pdf reader UPGRADE
Affected: >= 11.0 and < 11.1
Fixed in: 11.1
Safe to downgrade to: a release before 11.0
1. Check installed version
apt-cache policy pdf-reader || rpm -q pdf-reader || pdf-reader --version
2. UPGRADE to 11.1 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade pdf-reader
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade pdf-reader
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 11.0 (Debian / Ubuntu)
apt-cache madison pdf-reader sudo apt install pdf-reader=<VERSION_BEFORE_11.0> sudo apt-mark hold pdf-reader
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list pdf-reader sudo dnf downgrade pdf-reader-<VERSION_BEFORE_11.0> sudo dnf versionlock add pdf-reader
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.
foxit phantompdf UPGRADE
Affected: < 10.1.6
Fixed in: 10.1.6
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy phantompdf || rpm -q phantompdf || phantompdf --version
2. UPGRADE to 10.1.6 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade phantompdf
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade phantompdf
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
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-2021-40326?

pdf editor: upgrade to 11.1; pdf reader: upgrade to 11.1; phantompdf: upgrade to 10.1.6. Exact commands for each OS are on this page.

Is CVE-2021-40326 being exploited?

CVE-2021-40326 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-2021-40326 affect?

CVE-2021-40326 affects pdf editor, pdf reader, phantompdf. Severity is medium (CVSS 5.5). Foxit PDF Reader before 11.1 and PDF Editor before 11.1, and PhantomPDF before 10.1.6, mishandle hidden and incremental data in signed documents. An attacker can write to an arbitrary file, and display controlled contents, during signature

How urgent is CVE-2021-40326?

Priority 24/100. No elevated risk signals yet.

Related CVEs

References

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