CVE-2006-0459

Severity: high (CVSS 7.5 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2006-03-29 · updated 2026-06-16
Weakness: CWE-119

Description

flex.skl in Will Estes and John Millaway Fast Lexical Analyzer Generator (flex) before 2.5.33 does not allocate enough memory for grammars containing (1) REJECT statements or (2) trailing context rules, which causes flex to generate code that contains a buffer overflow that might allow context-dependent attackers to execute arbitrary code.

Affected products

Westes Flex: through 2.5.32

References

http://prdownloads.sourceforge.net/flex/flex-2.5.33.tar.bz2?download
http://secunia.com/advisories/19071
http://secunia.com/advisories/19126
http://secunia.com/advisories/19228
http://secunia.com/advisories/19424
http://securityreason.com/securityalert/570
http://sourceforge.net/mailarchive/forum.php?thread_name=20060223020346.GA11231%40tabitha.home.tldz.org&forum_name=flex-announce
http://www.gentoo.org/security/en/glsa/glsa-200603-07.xml
http://www.osvdb.org/23440
http://www.securityfocus.com/bid/16896
http://www.us.debian.org/security/2006/dsa-1020
http://www.vupen.com/english/advisories/2006/0770

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