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CVE-2026-54511: @logtape/syslog: syslog log injection via unescaped control characters and unvalidated SD-NAME keys

August 26, 2026

@logtape/syslog contains two related output-encoding bugs in the structured data formatting code. Both only affect deployments with includeStructuredData: true, which is non-default.

References

  • github.com/advisories/GHSA-8h6h-x5pq-56fq
  • github.com/dahlia/logtape/commit/7a6e5b9ddf7915edfff78fa129bc17c979b2a623
  • github.com/dahlia/logtape/releases/tag/1.3.11
  • github.com/dahlia/logtape/releases/tag/2.0.14
  • github.com/dahlia/logtape/releases/tag/2.1.5
  • github.com/dahlia/logtape/security/advisories/GHSA-8h6h-x5pq-56fq
  • nvd.nist.gov/vuln/detail/CVE-2026-54511

Code Behaviors & Features

Detect and mitigate CVE-2026-54511 with GitLab Dependency Scanning

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Affected versions

All versions before 1.3.11, all versions starting from 2.0.0 before 2.0.14, all versions starting from 2.1.0 before 2.1.5

Fixed versions

  • 1.3.11
  • 2.0.14
  • 2.1.5

Solution

Upgrade to versions 1.3.11, 2.0.14, 2.1.5 or above.

Impact 8.6 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

Learn more about CVSS

Weakness

  • CWE-117: Improper Output Neutralization for Logs
  • CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')

Source file

npm/@logtape/syslog/CVE-2026-54511.yml

Spotted a mistake? Edit the file on GitLab.

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