CVE-2006-0459: n/a vulnerability

CVE-2006-0459: flex.skl in Will Estes and John Millaway Fast Lexical Analyzer Generator (flex) before 2.5.33 does not allo...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 7, 2024, 16:34 UTC (UTC+00:00)

Security readout for executives and security teams

This older flex issue can create vulnerable scanner code during software builds. If an organization used flex before 2.5.33 with certain grammar features, resulting applications may contain a buffer overflow. Business urgency depends on whether those generated scanners process untrusted input. Exposure is most likely in legacy software built with flex before 2.5.33 using REJECT or trailing context rules. The provided CVE data does not identify specific downstream products, packages, or deployments beyond flex. Treat this as a targeted legacy exposure review, not an internet-wide emergency based on the provided evidence. Prioritize software supply chain and product teams that maintain parser-heavy code or old generated scanner artifacts. Mitigation focus: Inventory use of flex and generated lexer code in maintained and legacy products.; Upgrade build environments using flex before 2.5.33 to a fixed version.; Regenerate and rebuild affected scanners after upgrading flex, where vendor guidance confirms this path..

Prepared: Jun 29, 2026, 13:35 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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CVE-2006-0459 mapping review

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Mar 29, 2006, 23:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
flex-bypass-security(24995)CVE reference · vdb-entry, x_refsource_XF
USN-260-1CVE reference · vendor-advisory, x_refsource_UBUNTU

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

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Weakness

CWE details

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