CVE-2005-2656: Polygen before 1.0.6 generates precompiled grammar objects with world-writable permissions, which allows local

Routine

LOW 2.1WATCHLISTDOWNGRADE

CVE-2005-2656 is a low-severity flaw (CVSS 2.1) affecting polygen. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Polygen before 1.0.6 generates precompiled grammar objects with world-writable permissions, which allows local users to cause a denial of service (disk consumption) and possibly perform other unauthorized activities.

Why this priority

On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	2.1 (Low)
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Published	2005-09-06
Last modified	2026-06-16

Publisher (CNA): Debian GNU/Linux · Vendor: polygen

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2005-09-06 23:03 UTCPublished CVE record published
2026-06-16 22:15 UTCUpdated Record last modified

polygen polygen DOWNGRADE

Affected: 1.0.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.6

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0.6 (Debian / Ubuntu)

apt-cache madison polygen sudo apt install polygen=<VERSION_BEFORE_1.0.6> sudo apt-mark hold polygen

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list polygen sudo dnf downgrade polygen-<VERSION_BEFORE_1.0.6> sudo dnf versionlock add polygen

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.

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-2005-2656?

polygen: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2005-2656 being exploited?

CVE-2005-2656 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-2005-2656 affect?

CVE-2005-2656 affects polygen. Severity is low (CVSS 2.1). Polygen before 1.0.6 generates precompiled grammar objects with world-writable permissions, which allows local users to cause a denial of service (disk consumption) and possibly perform other unauthorized activities.

How urgent is CVE-2005-2656?

Priority 19/100. On your watchlist

References

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