CVE-2026-54511
HighCVSS 8.6Exploitation Probability (EPSS)
Low risk23th percentile - higher than 23% of all known CVEs
Summary
LogTape before versions 1.3.11, 2.0.14, and 2.1.5 has a vulnerability in the @logtape/syslog package that allows injection of forged syslog records. The escapeStructuredDataValue() function does not neutralize control characters, and formatStructuredData() does not validate keys, enabling manipulation of frames and data elements.
Risk Assessment
An attacker can send forged syslog records with arbitrary hosts, applications, processes, undermining the integrity of collectors and SIEM systems.
Recommendation
Update LogTape to version 1.3.11, 2.0.14, or 2.1.5. Additionally, validate input data before forwarding to syslog.
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Original NVD description (English source)
LogTape is an unobtrusive logging library. Prior to 1.3.11, 2.0.14, and 2.1.5, the @logtape/syslog package's escapeStructuredDataValue() function in packages/syslog/src/syslog.ts does not neutralize C0 control characters from U+0000 through U+001F in structured data values, and formatStructuredData() inserts property keys without validating the RFC 5424 SD-NAME grammar. When includeStructuredData is true, an attacker-controlled newline can terminate an RFC 6587 non-transparent TCP syslog frame and make following bytes appear as a forged RFC 5424 record, while a key containing a closing bracket or other forbidden character can terminate or corrupt the structured-data element. Applications that forward attacker-controlled property values or keys can therefore allow forged records with arbitrary hosts, applications, process identifiers, facilities, or severity levels, undermining downstream collector and SIEM integrity. This issue is fixed in versions 1.3.11, 2.0.14, and 2.1.5.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

