CVE-2005-3318: Buffer overflow in the _chm_decompress_block function in CHM lib (chmlib) before 0.37, as used in products suc

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MEDIUM 5.1DOWNGRADE

CVE-2005-3318 is a medium-severity flaw (CVSS 5.1) affecting chm lib. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in the _chm_decompress_block function in CHM lib (chmlib) before 0.37, as used in products such as KchmViewer, allows attackers to execute arbitrary code, a different vulnerability than CVE-2005-2930.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.1 (Medium)
EPSS exploit chance	3.8% (top 10%)
CISA exploited list	No
Published	2005-10-27
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: jed wing

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

Am I affected?

Timeline

2005-10-27 10:02 UTCPublished CVE record published
2026-06-16 22:16 UTCUpdated Record last modified

jed wing chm lib DOWNGRADE

Affected: 0.1 · 0.2 · 0.3 · 0.31 · 0.32 · 0.33 · 0.35 · 0.36

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.1

1. Check installed version

apt-cache policy chm-lib || rpm -q chm-lib || chm-lib --version

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

apt-cache madison chm-lib sudo apt install chm-lib=<VERSION_BEFORE_0.1> sudo apt-mark hold chm-lib

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

dnf --showduplicates list chm-lib sudo dnf downgrade chm-lib-<VERSION_BEFORE_0.1> sudo dnf versionlock add chm-lib

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-2005-3318?

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

Is CVE-2005-3318 being exploited?

CVE-2005-3318 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-2005-3318 affect?

CVE-2005-3318 affects chm lib. Severity is medium (CVSS 5.1). Buffer overflow in the _chm_decompress_block function in CHM lib (chmlib) before 0.37, as used in products such as KchmViewer, allows attackers to execute arbitrary code, a different vulnerability than CVE-2005-2930.

How urgent is CVE-2005-3318?

Priority 40/100. No elevated risk signals yet.

Related CVEs

CVE-2006-3178 MEDIUM 5.0 UPGRADE Directory traversal vulnerability in extract_chmLib example program in CHM Lib (chmlib) before 0.38 allows rem
CVE-2005-2930 MEDIUM 5.1 DOWNGRADE Stack-based buffer overflow in the _chm_find_in_PMGL function in chm_lib.c for chmlib before 0.36, as used in
CVE-2005-2659 HIGH 10.0 DOWNGRADE Buffer overflow in the LZX decompression in CHM Lib (chmlib) 0.35, as used in products such as KchmViewer, has

References

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