CVE-2026-5941: Parsing logic flaws cause non-signature data to be misidentified as valid signatures when processing malformed

Q: How do I fix CVE-2026-5941?

pdf editor: upgrade to 14.0.4, 2026.1.1; pdf reader: upgrade to 2026.1.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-5941 being exploited?

CVE-2026-5941 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-2026-5941 affect?

CVE-2026-5941 affects pdf editor, pdf reader. Severity is high (CVSS 7.8). Parsing logic flaws cause non-signature data to be misidentified as valid signatures when processing malformed form field hierarchies, leading to invalid memory writes and program crashes during internal data structure construction.

Q: How urgent is CVE-2026-5941?

Priority 34/100. High severity; On your watchlist

Routine

HIGH 7.8WATCHLISTUPGRADEUPGRADE

CVE-2026-5941 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.

Parsing logic flaws cause non-signature data to be misidentified as valid signatures when processing malformed form field hierarchies, leading to invalid memory writes and program crashes during internal data structure construction.

Why this priority

High severity
On your watchlist

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	0.2% (top 94%)
CISA exploited list	No
Weakness	CWE-20
Published	2026-04-27
Last modified	2026-10-26

Publisher (CNA): Foxit · Vendor: foxit

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-27 12:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

foxit pdf editor UPGRADE

Affected: >= 14.0.0 and < 14.0.4 · >= 2023.0.0 and < 2026.1.1

Fixed in: 14.0.4, 2026.1.1

Safe to downgrade to: a release before 14.0.0

1. Check installed version

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

2. UPGRADE to 14.0.4 (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 (Debian / Ubuntu)

apt-cache madison pdf-editor sudo apt install pdf-editor=<VERSION_BEFORE_14.0.0> 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_14.0.0> 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: < 2026.1.1

Fixed in: 2026.1.1

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 2026.1.1 (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.

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-2026-5941?

pdf editor: upgrade to 14.0.4, 2026.1.1; pdf reader: upgrade to 2026.1.1. Exact commands for each OS are on this page.

Is CVE-2026-5941 being exploited?

CVE-2026-5941 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-2026-5941 affect?

CVE-2026-5941 affects pdf editor, pdf reader. Severity is high (CVSS 7.8). Parsing logic flaws cause non-signature data to be misidentified as valid signatures when processing malformed form field hierarchies, leading to invalid memory writes and program crashes during internal data structure construction.

How urgent is CVE-2026-5941?

Priority 34/100. High severity; On your watchlist

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References

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