CVE-2005-3656: Multiple format string vulnerabilities in logging functions in mod_auth_pgsql before 2.0.3, when used for user

Q: How do I fix CVE-2005-3656?

mod auth pgsql: upgrade to newer than 2.0.3. Exact commands for each OS are on this page.

Q: Is CVE-2005-3656 being exploited?

CVE-2005-3656 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-2005-3656 affect?

CVE-2005-3656 affects mod auth pgsql. Severity is high (CVSS 10.0). Multiple format string vulnerabilities in logging functions in mod_auth_pgsql before 2.0.3, when used for user authentication against a PostgreSQL database, allows remote unauthenticated attackers to execute arbitrary code, as demonstrated

Q: How urgent is CVE-2005-3656?

Priority 59/100. Critical severity; EPSS top 5%: very likely to be exploited

This week

HIGH 10.0UPGRADE

CVE-2005-3656 is a high-severity flaw (CVSS 10.0) affecting mod auth pgsql. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple format string vulnerabilities in logging functions in mod_auth_pgsql before 2.0.3, when used for user authentication against a PostgreSQL database, allows remote unauthenticated attackers to execute arbitrary code, as demonstrated via the username.

Why this priority

Critical severity
EPSS top 5%: very likely to be exploited

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	8.9% (top 5%)
CISA exploited list	No
Weakness	CWE-134
Published	2005-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: guiseppe tanzilli and matthias eckermann

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

Am I affected?

Timeline

2005-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:17 UTCUpdated Record last modified

guiseppe tanzilli and matthias eckermann mod auth pgsql UPGRADE

Affected: <= 2.0.3 · 0.9.5 · 0.9.6

Fixed in: newer than 2.0.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mod-auth-pgsql || rpm -q mod-auth-pgsql || mod-auth-pgsql --version

2. UPGRADE to newer than 2.0.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mod-auth-pgsql

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mod-auth-pgsql

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-2005-3656?

mod auth pgsql: upgrade to newer than 2.0.3. Exact commands for each OS are on this page.

Is CVE-2005-3656 being exploited?

CVE-2005-3656 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-2005-3656 affect?

CVE-2005-3656 affects mod auth pgsql. Severity is high (CVSS 10.0). Multiple format string vulnerabilities in logging functions in mod_auth_pgsql before 2.0.3, when used for user authentication against a PostgreSQL database, allows remote unauthenticated attackers to execute arbitrary code, as demonstrated

How urgent is CVE-2005-3656?

Priority 59/100. Critical severity; EPSS top 5%: very likely to be exploited

Software pages

PostgreSQL vulnerabilities

Related CVEs

CVE-2001-1379 HIGH 7.5 DOWNGRADE The PostgreSQL authentication modules (1) mod_auth_pgsql 0.9.5, and (2) mod_auth_pgsql_sys 0.9.4, allow remote

References

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