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Vulnerabilities

Vulnerability · CVE-2018-21232

re2c before 2.0 has uncontrolled recursion that causes stack consumption in find_fixed_tags.

Published Apr 29, 2020 · catalog updated Nov 3, 2026 · re2c before 2.0 has

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2018-21232. EPSS is 1.47%. Act only if a listed version of re2c before 2.0 has is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (re2c before 2.0 has).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.47%
Remediation
Advisory link
Affected products
Debian:12 re2c · Debian:13 re2c · Debian:14 re2c

re2c before 2.0 has uncontrolled recursion that causes stack consumption in find_fixed_tags.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 re2c3.0-2, 3.1-1, 4.0.1-1
  • Debian:13 re2c0 → 3.1-1
  • Debian:14 re2c0 → 3.1-1

How to fix CVE-2018-21232

  • Upgrade

    CVE-2018-21232 lists a fix boundary at 3.1-1. Compare the installed build with that boundary before you change production.

  • Version check

    Fixed in 3.1-1 · 4 other ranges on the advisory

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2018-21232. EPSS is 1.47%. Act only if a listed version of re2c before 2.0 has is installed.

Which versions are affected?

Compare what you have installed with 3.0-2, 3.1-1, 4.0.1-1, 0 → 3.1-1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 1.47%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 29, 2020 · Trivy Vulnerability DB

    Detected

    re2c before 2.0 has uncontrolled recursion that causes stack consumption in find_fixed_tags.

  2. Nov 3, 2026 · Trivy Vulnerability DB

    Fix available

    re2c fixed in 3.1-1; re2c fixed in 3.1-1

  3. Nov 3, 2026 · Trivy Vulnerability DB

    Fix available

    re2c fixed in 3.1-1

  4. Nov 3, 2026 · Trivy Vulnerability DB

    Updated

    re2c before 2.0 has uncontrolled recursion that causes stack consumption in find_fixed_tags.

Sources

  • CVE.orgVulnerability recordCVE-2018-21232

    Official CVE identifier

    cve.org
  • Trivy Vulnerability DBPackage advisoryDEBIAN-CVE-2018-21232

    re2c before 2.0 has uncontrolled recursion that causes stack consumption in find_fixed_tags.

    osv.dev

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 4, 2026
  • Trivy Vulnerability DBNov 3, 2026