CVE-2006-0459 json
flex.skl in Will Estes and John Millaway Fast Lexical Analyzer Generator (flex) before 2.5.33 does not allocate enough memory for grammars…
published 2006-03-29 20 y ago modified 2026-06-16 4 mo ago also EUVD-2006-0466
- cvss
- 7.5
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 4.7%
- EPSS 4.7% chance of exploitation in 30 days, percentile 91%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- flex Debian 14, Debian 13, Debian 12 2.5.33-1
debian advisories DEBIAN-CVE-2006-0459
- osvdb.org/23440 patch
- us.debian.org/security/2006/dsa-1020 advisory
- secunia.com/advisories/19071 advisory
- securityfocus.com/bid/16896 advisory
- secunia.com/advisories/19424 advisory
Exploit prediction
4.71% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Classification
- Weakness
-
- CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
References
-
us.debian.org
/security/2006/dsa-1020
vendor-advisory, patch
-
osvdb.org
/23440
vdb-entry, broken-link, patch
-
secunia.com
/advisories/19071
third-party-advisory, patch, vendor-advisory
-
securityfocus.com
/bid/16896
vdb-entry, patch, third-party-advisory
-
secunia.com
/advisories/19424
third-party-advisory, patch, vendor-advisory
-
gentoo.org
/security/en/glsa/glsa-200603-07.xml
vendor-advisory, third-party-advisory
-
usn.ubuntu.com
/260-1/
vendor-advisory, third-party-advisory
-
secunia.com
/advisories/19228
third-party-advisory, vendor-advisory
-
secunia.com
/advisories/19126
third-party-advisory, vendor-advisory
-
prdownloads.sourceforge.net
/flex/flex-2.5.33.tar.bz2?download
product
-
vupen.com
/english/advisories/2006/0770
vdb-entry, broken-link, url-repurposed
-
exchange.xforce.ibmcloud.com
/vulnerabilities/24995
vdb-entry
-
securityreason.com
/securityalert/570
third-party-advisory
-
sourceforge.net
/mailarchive/forum.php?thread_name=20060223020346.GA11231%40tabitha.home.tldz.org&forum_name=flex-announce
mailing-list, release-notes
Sources
- CVE List CVE-2006-0459
- NVD CVE-2006-0459
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.