CVE-2005-2659: Buffer overflow in the LZX decompression in CHM Lib (chmlib) 0.35, as used in products such as KchmViewer, has

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HIGH 10.0WATCHLISTDOWNGRADE

CVE-2005-2659 is a high-severity flaw (CVSS 10.0) 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 LZX decompression in CHM Lib (chmlib) 0.35, as used in products such as KchmViewer, has unknown impact and attack vectors.

Why this priority

Critical severity
On your watchlist

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	2.2% (top 18%)
CISA exploited list	No
Published	2005-11-16
Last modified	2026-06-16

Publisher (CNA): Debian GNU/Linux · 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

2005-11-16 07:42 UTCPublished CVE record published
2026-06-16 22:15 UTCUpdated Record last modified

jed wing chm lib DOWNGRADE

Affected: 0.35

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.35

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 0.35 (Debian / Ubuntu)

apt-cache madison chm-lib sudo apt install chm-lib=<VERSION_BEFORE_0.35> 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_0.35> 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-2005-2659?

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

Is CVE-2005-2659 being exploited?

CVE-2005-2659 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-2005-2659 affect?

CVE-2005-2659 affects chm lib. Severity is high (CVSS 10.0). Buffer overflow in the LZX decompression in CHM Lib (chmlib) 0.35, as used in products such as KchmViewer, has unknown impact and attack vectors.

How urgent is CVE-2005-2659?

Priority 61/100. Critical severity; On your watchlist

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-2005-3318 MEDIUM 5.1 DOWNGRADE Buffer overflow in the _chm_decompress_block function in CHM lib (chmlib) before 0.37, as used in products suc
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

References

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