CVE-2009-3996: Heap-based buffer overflow in IN_MOD.DLL (aka the Module Decoder Plug-in) in Winamp before 5.57, and libmikmod

This month

HIGH 9.3UPGRADEDOWNGRADE

CVE-2009-3996 is a high-severity flaw (CVSS 9.3) affecting winamp, libmikmod. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heap-based buffer overflow in IN_MOD.DLL (aka the Module Decoder Plug-in) in Winamp before 5.57, and libmikmod 3.1.12, might allow remote attackers to execute arbitrary code via an Ultratracker file.

Why this priority

Critical severity
EPSS top 6%: very likely to be exploited

A fixed release or distro patch exists.

Risk facts

CVSS score	9.3 (High)
EPSS exploit chance	6.5% (top 6%)
CISA exploited list	No
Weakness	CWE-119
Published	2009-12-18
Last modified	2026-06-16

Publisher (CNA): Flexera Software LLC · Vendor: nullsoft · raphael assenat

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

Am I affected?

Timeline

2009-12-18 19:30 UTCPublished CVE record published
2026-06-16 23:12 UTCUpdated Record last modified

nullsoft winamp UPGRADE

Affected: <= 5.56 · 0.20a · 0.92 · 1.006 · 1.90 · 2.0 · 2.4 · 2.5e

Fixed in: newer than 5.56

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 5.56 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade winamp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade winamp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

raphael assenat libmikmod DOWNGRADE

Affected: 3.1.12

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.1.12

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.1.12 (Debian / Ubuntu)

apt-cache madison libmikmod sudo apt install libmikmod=<VERSION_BEFORE_3.1.12> sudo apt-mark hold libmikmod

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

dnf --showduplicates list libmikmod sudo dnf downgrade libmikmod-<VERSION_BEFORE_3.1.12> sudo dnf versionlock add libmikmod

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-2009-3996?

winamp: upgrade to newer than 5.56; libmikmod: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2009-3996 being exploited?

CVE-2009-3996 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-2009-3996 affect?

CVE-2009-3996 affects winamp, libmikmod. Severity is high (CVSS 9.3). Heap-based buffer overflow in IN_MOD.DLL (aka the Module Decoder Plug-in) in Winamp before 5.57, and libmikmod 3.1.12, might allow remote attackers to execute arbitrary code via an Ultratracker file.

How urgent is CVE-2009-3996?

Priority 56/100. Critical severity; EPSS top 6%: very likely to be exploited

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References

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