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CVE-2026-27890

Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, when processing CNCT_specific_data segments during authentication, the server assumes segments arrive in strictly ascending order. If segments arrive out of order, the Array class's grow() method computes a negative size value, causing a SIGSEGV crash. An unauthenticated attacker who knows only the server's IP and port can exploit this to crash the server. This issue has been fixed in
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:4294c3f18e382edcfe1e367ba2b8b0603dc5614ac33e17a14eb948d8037544a5
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-119","description":"CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:192449074d7e1f9704c5968019b7c8496e1a54861053dcddf779bc5794f78b99 · sha256:86b4634cddb00449… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-787","description":"CWE-787: Out-of-bounds Write","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:192449074d7e1f9704c5968019b7c8496e1a54861053dcddf779bc5794f78b99 · sha256:86b4634cddb00449… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"firebird","vendor":"FirebirdSQL","versions":[{"status":"affected","version":">= 3.0.0, < 3.0.14"},{"status":"affected","version":">= 4.0.0, < 4.0.7"},{"status":"affected","version":">= 5.0.0, < 5.0.4"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:192449074d7e1f9704c5968019b7c8496e1a54861053dcddf779bc5794f78b99 · sha256:86b4634cddb00449… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:192449074d7e1f9704c5968019b7c8496e1a54861053dcddf779bc5794f78b99 · sha256:86b4634cddb00449… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-119","description":"CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:192449074d7e1f9704c5968019b7c8496e1a54861053dcddf779bc5794f78b99 · sha256:86b4634cddb00449… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-787","description":"CWE-787: Out-of-bounds Write","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:192449074d7e1f9704c5968019b7c8496e1a54861053dcddf779bc5794f78b99 · sha256:86b4634cddb00449… · /containers/cna/problemTypes/1/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14","tags":["x_refsource_MISC"],"url":"https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:192449074d7e1f9704c5968019b7c8496e1a54861053dcddf779bc5794f78b99 · sha256:86b4634cddb00449… · /containers/cna/references/1
{"name":"https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7","tags":["x_refsource_MISC"],"url":"https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:192449074d7e1f9704c5968019b7c8496e1a54861053dcddf779bc5794f78b99 · sha256:86b4634cddb00449… · /containers/cna/references/2
{"name":"https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4","tags":["x_refsource_MISC"],"url":"https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:192449074d7e1f9704c5968019b7c8496e1a54861053dcddf779bc5794f78b99 · sha256:86b4634cddb00449… · /containers/cna/references/3
{"name":"https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-6crx-4g37-7j49","tags":["x_refsource_CONFIRM"],"url":"https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-6crx-4g37-7j49"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:192449074d7e1f9704c5968019b7c8496e1a54861053dcddf779bc5794f78b99 · sha256:86b4634cddb00449… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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