CVE-2006-6259: Multiple directory traversal vulnerabilities in (a) class/functions.php and (b) class/m_bro.php in AlternC 0.9

Q: How do I fix CVE-2006-6259?

alternc: upgrade to newer than 0.9.5. Exact commands for each OS are on this page.

Q: Is CVE-2006-6259 being exploited?

CVE-2006-6259 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2006-6259 affect?

CVE-2006-6259 affects alternc. Severity is high (CVSS 10.0). Multiple directory traversal vulnerabilities in (a) class/functions.php and (b) class/m_bro.php in AlternC 0.9.5 and earlier allow remote attackers to (1) create arbitrary files and directories via a .. (dot dot) in the "create name" field

Q: How urgent is CVE-2006-6259?

Priority 63/100. Critical severity; EPSS top 9%: very likely to be exploited; Public exploit reference

This week

HIGH 10.0UPGRADE

CVE-2006-6259 is a high-severity flaw (CVSS 10.0) affecting alternc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple directory traversal vulnerabilities in (a) class/functions.php and (b) class/m_bro.php in AlternC 0.9.5 and earlier allow remote attackers to (1) create arbitrary files and directories via a .. (dot dot) in the "create name" field and (2) read arbitrary files via a .. (dot dot) in the "web root" field when configuring a subdomain.

Why this priority

Critical severity
EPSS top 9%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	4.0% (top 9%)
CISA exploited list	No
Published	2006-12-04
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: alternc

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

Am I affected?

Timeline

2006-12-04 11:28 UTCPublished CVE record published
2026-06-16 22:32 UTCUpdated Record last modified

alternc alternc UPGRADE

Affected: <= 0.9.5

Fixed in: newer than 0.9.5

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 0.9.5 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade alternc

Note

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

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-2006-6259?

alternc: upgrade to newer than 0.9.5. Exact commands for each OS are on this page.

Is CVE-2006-6259 being exploited?

CVE-2006-6259 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-2006-6259 affect?

CVE-2006-6259 affects alternc. Severity is high (CVSS 10.0). Multiple directory traversal vulnerabilities in (a) class/functions.php and (b) class/m_bro.php in AlternC 0.9.5 and earlier allow remote attackers to (1) create arbitrary files and directories via a .. (dot dot) in the "create name" field

How urgent is CVE-2006-6259?

Priority 63/100. Critical severity; EPSS top 9%: very likely to be exploited; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2006-6258 HIGH 9.3 UPGRADE The phpmyadmin subsystem in AlternC 0.9.5 and earlier transmits the SQL password in cleartext in a cookie, whi
CVE-2006-6257 MEDIUM 6.8 UPGRADE The file manager in AlternC 0.9.5 and earlier, when warnings are enabled in PHP, allows remote attackers to ob
CVE-2006-6256 MEDIUM 6.8 UPGRADE Cross-site scripting (XSS) vulnerability in the file manager in admin/bro_main.php in AlternC 0.9.5 and earlie

References

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