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Vulnerability Database · Debian · Package report

flex: vulnerability history, versions and safety

flex is a package in the Debian ecosystem. Vulert records 7 vulnerabilities for it across 3 releases, from Mar 2006 to Jan 2019. Each vulnerability names the versions it affects, the fixed version to move to, and a workaround where no fix has been published.

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7 vulnerabilities recorded U7
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2 with no fix published

No patched version yet — these are the ones to plan around.

See the unfixed vulnerabilities →
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0 in the last 12 months

Nothing new recorded in the last year.

See the disclosure history →
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0 malicious-package vulnerabilities

No published version shipped hostile code.

See all flex vulnerabilities

Vulert verdict on flex i

Updated on 23 Oct 2026

Careful: 2 of the 7 vulnerabilities Vulert records for this package have no fix yet. Plan around those, or apply the workaround listed for each. The rest have a fixed version to move to.

Long-term outlook: usable, but needs attention 7 vulnerabilities on record across 12 years, none in the last year.

What to do: Plan around the 2 vulnerabilities with no published fix: each lists the affected range and any workaround that reduces exposure. No fix yet: Vulert alerts you the moment one is published. Monitor it with Vulert →

  • Vulnerabilities on record 7 over 12 years · 0 in the last year i
  • Latest disclosure 15 Jan 2019 i
  • Highest CVSS 5.5 i
  • With no published fix 2 i

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01 Versions

Which versions are affected

Every version Vulert holds for flex, newest first, with the vulnerabilities that name it. A version with a count of zero has no recorded vulnerabilities; open a version to see the vulnerabilities it is exposed to.

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Version Vulert vulnerabilities Fix published Details
2.6.4-8.2 U2 No Details →
2.6.4-8.1 U2 No Details →
2.6.4-8 U2 No Details →

Newest 3 of 3 versions on record. Severity counts are the vulnerabilities recorded against that exact release.

02 Disclosure history

How often vulnerabilities are recorded

  • 2006 2
  • 2010 2
  • 2016 1
  • 2019 2

Counted by the year Vulert recorded each vulnerability — the same date the table below shows as disclosed. 0 of the 7 were recorded in the last 12 months.

03 Vulnerabilities

Recorded vulnerabilities for flex

The 5 most severe of 7 vulnerabilities recorded for this package

Search all 7 in the database →
Vulnerability Severity Fixed version ↓ Disclosed ↓
Stack Exhaustion in flex 2.6.4 5.5 medium No fix published 15 Jan 2019
Buffer Overflow Vulnerability in Flex Package - CVE-2006-0459 N/A unrated 2.5.33-1 29 Mar 2006
Critical Vulnerability in Flex Package: CVE-2010-0634 N/A unrated 2.5.35-1 12 Feb 2010
Buffer Overflow Vulnerability in flex Package - CVE-2006-0459 N/A unrated 2.5.33-1 29 Mar 2006
Critical Vulnerability in Flex Package: Unspecified Security Flaw N/A unrated 2.5.35-1 12 Feb 2010

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Updated: 23/Oct/2026 · Vulnerabilities in our DB: 524315

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Questions

About flex

Is flex safe to use?

Vulert records 7 vulnerabilities for flex in Debian: 0 critical, 0 high, 0 medium and 0 low, plus 7 not yet rated. 2 of them have no published fix yet, so those are the ones to avoid or mitigate.

How many vulnerabilities does flex have?

7 vulnerabilities are recorded for flex in the Debian ecosystem: 0 critical, 0 high, 0 medium and 0 low, plus 7 not yet rated. The ledger on this page lists the same counts next to the date of the most recent disclosure.

How often are new flex vulnerabilities disclosed?

0 vulnerabilities were recorded for flex in the last 12 months, and the oldest entry in this database dates to 29 Mar 2006. Recency matters more than a lifetime total: it shows how actively new issues are being disclosed for the package you are considering.

Which versions of flex are affected?

Each vulnerability on this page lists the affected version range and the fixed version to move to. Open the vulnerability for the version you actually run — fixes are specific to a release line, not to the package as a whole.

How do I monitor flex for upcoming vulnerabilities?

Upload the manifest or SBOM for your application at vulert.com/scanner and Vulert keeps checking the flex version you actually run against new disclosures, then alerts you when one affects it. There is no installation and no source-code access required.