CVE-2026-91797: Foxit PDF Editor/Reader failed to validate the directory traversal path in the attachment file name, resulting

Q: How do I fix CVE-2026-91797?

pdf editor: upgrade to newer than 2026.2.0.39747; pdf reader: upgrade to newer than 2026.2.0.39747. Exact commands for each OS are on this page.

Q: Is CVE-2026-91797 being exploited?

CVE-2026-91797 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-2026-91797 affect?

CVE-2026-91797 affects pdf editor, pdf reader. Severity is high (CVSS 7.8). Foxit PDF Editor/Reader failed to validate the directory traversal path in the attachment file name, resulting in malicious attachments being able to be written to directories outside the expected secure area when the PDF is opened.

Routine

HIGH 7.8UPGRADEUPGRADE

CVE-2026-91797 is a high-severity flaw (CVSS 7.8) affecting pdf editor, pdf reader. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Foxit PDF Editor/Reader failed to validate the directory traversal path in the attachment file name, resulting in malicious attachments being able to be written to directories outside the expected secure area when the PDF is opened.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 72%)
CISA exploited list	No
Weakness	CWE-73
Published	2026-09-23
Last modified	2026-10-08

Publisher (CNA): Foxit · Vendor: foxit

Last updated 2026-10-08 · 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
2026-10-08 13:49 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

Fixed in: newer than 2026.2.0.39747

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 2026.2.0.39747 (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

Fixed in: newer than 2026.2.0.39747

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 2026.2.0.39747 (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-2026-91797?

pdf editor: upgrade to newer than 2026.2.0.39747; pdf reader: upgrade to newer than 2026.2.0.39747. Exact commands for each OS are on this page.

Is CVE-2026-91797 being exploited?

CVE-2026-91797 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-2026-91797 affect?

CVE-2026-91797 affects pdf editor, pdf reader. Severity is high (CVSS 7.8). Foxit PDF Editor/Reader failed to validate the directory traversal path in the attachment file name, resulting in malicious attachments being able to be written to directories outside the expected secure area when the PDF is opened.

How urgent is CVE-2026-91797?

Priority 34/100. High severity

Related CVEs

CVE-2026-5941 HIGH 7.8 UPGRADE UPGRADE Parsing logic flaws cause non-signature data to be misidentified as valid signatures when processing malformed
CVE-2026-5940 HIGH 7.8 UPGRADE UPGRADE Calling a function that triggers a UI refresh after removing comments via a script may access an invalidated o
CVE-2026-5943 HIGH 7.8 UPGRADE UPGRADE Document structural anomalies caused inconsistencies between page element relationships and internal index sta
CVE-2026-5942 MEDIUM 5.5 UPGRADE UPGRADE Flaws in page lifecycle management allow document structure changes to desynchronize internal component states
CVE-2026-5939 MEDIUM 5.5 UPGRADE UPGRADE A crafted XFA PDF can trigger a use-after-free condition during calculate event processing, causing the applic

References

← Back to latest CVEs