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CVE-2006-0459
flex.skl in Will Estes and John Millaway Fast Lexical Analyzer Generator (flex) before 2.5.33 does not allocate enough memory for grammars…
High7.5EPSS 4.7%
- Published
- Updated
- Reserved
- Assigned by
- redhat
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | High7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
- EPSS (exploitation in 30 days)
- 4.7% · top 8.2% of all CVEs (4 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
Affected products
n/a
- affected n/a
References (14)
- http://prdownloads.sourceforge.net/flex/flex-2.5.33.tar.bz2?download (opens in a new tab)x_refsource_CONFIRMx_transferred
- 23440 (opens in a new tab)vdb-entryx_refsource_OSVDBx_transferred
- DSA-1020 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- ADV-2006-0770 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
- 19071 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- 16896 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- flex-bypass-security(24995) (opens in a new tab)vdb-entryx_refsource_XFx_transferred
- GLSA-200603-07 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
- 19228 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- 19424 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- 570 (opens in a new tab)third-party-advisoryx_refsource_SREASONx_transferred
- 19126 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- USN-260-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- [flex-announce] 20060222 flex 2.5.33 released (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://trackcve.app/cve/CVE-2006-0459)Record last updated .