CVE-2026-91814: A signature validation vulnerability exists in Foxit PDF Editor/Reader’s handling of incrementally updated PDF

Q: How do I fix CVE-2026-91814?

pdf editor: upgrade to newer than 2026.2.0.72029; pdf reader: upgrade to newer than 2026.2.1.39815. Exact commands for each OS are on this page.

Q: Is CVE-2026-91814 being exploited?

CVE-2026-91814 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-2026-91814 affect?

CVE-2026-91814 affects pdf editor, pdf reader. Severity is medium (CVSS 5.3). A signature validation vulnerability exists in Foxit PDF Editor/Reader’s handling of incrementally updated PDF documents. Changes to visible document content may not invalidate the existing signature, allowing attackers to alter signed cont

Q: How urgent is CVE-2026-91814?

Priority 20/100. No elevated risk signals yet.

Routine

MEDIUM 5.3UPGRADEUPGRADE

CVE-2026-91814 is a medium-severity flaw (CVSS 5.3) affecting pdf editor, pdf reader. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A signature validation vulnerability exists in Foxit PDF Editor/Reader’s handling of incrementally updated PDF documents. Changes to visible document content may not invalidate the existing signature, allowing attackers to alter signed content and potentially carry out content spoofing while the document continues to appear validly signed.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-347
Published	2026-09-23
Last modified	2026-10-29

Publisher (CNA): Foxit · Vendor: foxit

Last updated 2026-10-29 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-23 08:17 UTCPublished CVE record published
2026-10-29 17:15 UTCUpdated Record last modified

foxit pdf editor UPGRADE

Affected: <= 13.2.5.63482 · >= 14.0.0.33046 and <= 14.0.7.33751 · >= 2023.1.0.15510 and <= 2023.3.0.23028 · >= 2024.1.0.23997 and <= 2024.4.1.27687 · >= 2025.1.0.27937 and <= 2025.3.0.35737 · >= 2026.1.0.36452 and <= 2026.2.0.39747 · <= 13.2.2.63349 · >= 14.0.0.68868 and <= 14.0.7.69441

Fixed in: newer than 2026.2.0.72029

Safe to downgrade to: a release before 14.0.0.33046

1. Check installed version

apt-cache policy pdf-editor || rpm -q pdf-editor || pdf-editor --version

2. UPGRADE to newer than 2026.2.0.72029 (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 14.0.0.33046 (Debian / Ubuntu)

apt-cache madison pdf-editor sudo apt install pdf-editor=<VERSION_BEFORE_14.0.0.33046> 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_14.0.0.33046> 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: <= 2026.2.0.39747 · <= 2026.2.1.39815

Fixed in: newer than 2026.2.1.39815

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy pdf-reader || rpm -q pdf-reader || pdf-reader --version

2. UPGRADE to newer than 2026.2.1.39815 (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.

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-2026-91814?

pdf editor: upgrade to newer than 2026.2.0.72029; pdf reader: upgrade to newer than 2026.2.1.39815. Exact commands for each OS are on this page.

Is CVE-2026-91814 being exploited?

CVE-2026-91814 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-2026-91814 affect?

CVE-2026-91814 affects pdf editor, pdf reader. Severity is medium (CVSS 5.3). A signature validation vulnerability exists in Foxit PDF Editor/Reader’s handling of incrementally updated PDF documents. Changes to visible document content may not invalidate the existing signature, allowing attackers to alter signed cont

How urgent is CVE-2026-91814?

Priority 20/100. No elevated risk signals yet.

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References

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