CVE-2007-1745: The chm_decompress_stream function in libclamav/chmunpack.c in Clam AntiVirus (ClamAV) before 0.90.2 leaks fil

This month

HIGH 7.1UPGRADEDOWNGRADE

CVE-2007-1745 is a high-severity flaw (CVSS 7.1) affecting clamav, ifenslave. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The chm_decompress_stream function in libclamav/chmunpack.c in Clam AntiVirus (ClamAV) before 0.90.2 leaks file descriptors, which has unknown impact and attack vectors involving a crafted CHM file, a different vulnerability than CVE-2007-0897. NOTE: some of these details are obtained from third party information.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.1 (High)
EPSS exploit chance	2.3% (top 16%)
CISA exploited list	No
Published	2007-04-16
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: clam anti-virus · ifenslave

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

Am I affected?

Timeline

2007-04-16 21:19 UTCPublished CVE record published
2026-06-16 22:38 UTCUpdated Record last modified

clam anti-virus clamav UPGRADE

Affected: <= 0.90.1

Fixed in: newer than 0.90.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 0.90.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade clamav

Note

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

ifenslave ifenslave DOWNGRADE

Affected: 0.88

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.88

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.88 (Debian / Ubuntu)

apt-cache madison ifenslave sudo apt install ifenslave=<VERSION_BEFORE_0.88> sudo apt-mark hold ifenslave

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

dnf --showduplicates list ifenslave sudo dnf downgrade ifenslave-<VERSION_BEFORE_0.88> sudo dnf versionlock add ifenslave

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-2007-1745?

clamav: upgrade to newer than 0.90.1; ifenslave: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2007-1745 being exploited?

CVE-2007-1745 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-2007-1745 affect?

CVE-2007-1745 affects clamav, ifenslave. Severity is high (CVSS 7.1). The chm_decompress_stream function in libclamav/chmunpack.c in Clam AntiVirus (ClamAV) before 0.90.2 leaks file descriptors, which has unknown impact and attack vectors involving a crafted CHM file, a different vulnerability than CVE-2007-0

How urgent is CVE-2007-1745?

Priority 46/100. High severity

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References

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