CVE-2006-0056: Double free vulnerability in the authentication and authentication token alteration code in PAM-MySQL 0.6.x be

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HIGH 7.5WATCHLISTDOWNGRADE

CVE-2006-0056 is a high-severity flaw (CVSS 7.5) affecting pam-mysql. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Double free vulnerability in the authentication and authentication token alteration code in PAM-MySQL 0.6.x before 0.6.2 and 0.7.x before 0.7pre3 allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via crafted passwords, which lead to a double free of a pointer that was created by the pam_get_item function. NOTE: this issue only occurs in certain configurations in which there are multiple

Why this priority

High severity
EPSS top 6%: very likely to be exploited
On your watchlist

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	6.3% (top 6%)
CISA exploited list	No
Weakness	CWE-119
Published	2006-02-13
Last modified	2026-06-16

Publisher (CNA): CERT/CC · Vendor: pam-mysql

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

Am I affected?

Timeline

2006-02-13 11:06 UTCPublished CVE record published
2026-06-16 22:19 UTCUpdated Record last modified

pam-mysql pam-mysql DOWNGRADE

Affected: 0.1 · 0.2 · 0.3 · 0.4 · 0.4.7 · 0.5 · 0.6 · 0.7_pre1

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.1

1. Check installed version

apt-cache policy pam-mysql || rpm -q pam-mysql || pam-mysql --version

2. No fixed release: DOWNGRADE to a release before 0.1 (Debian / Ubuntu)

apt-cache madison pam-mysql sudo apt install pam-mysql=<VERSION_BEFORE_0.1> sudo apt-mark hold pam-mysql

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

dnf --showduplicates list pam-mysql sudo dnf downgrade pam-mysql-<VERSION_BEFORE_0.1> sudo dnf versionlock add pam-mysql

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-2006-0056?

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

Is CVE-2006-0056 being exploited?

CVE-2006-0056 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-2006-0056 affect?

CVE-2006-0056 affects pam-mysql. Severity is high (CVSS 7.5). Double free vulnerability in the authentication and authentication token alteration code in PAM-MySQL 0.6.x before 0.6.2 and 0.7.x before 0.7pre3 allows remote attackers to cause a denial of service (application crash) and possibly execute

How urgent is CVE-2006-0056?

Priority 55/100. High severity; EPSS top 6%: very likely to be exploited; On your watchlist

Software pages

MySQL vulnerabilities

References

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