CVE-2026-54511
Received Received - Intake

LogTape syslog C0 Control Character Injection

Publication date: 2026-08-26

Last updated on: 2026-08-26

Assigner: GitHub, Inc.

Description
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.

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Meta Information

Published
2026-08-26
Last Modified
2026-08-26
Generated
2026-08-26
AI Q&A
2026-08-26
EPSS Evaluated
N/A
NVD
CVE-2026-54511
EUVD
EUVD-2026-66563

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
logtape logtape to 1.3.11 (inc)
logtape logtape to 2.0.14 (inc)
logtape logtape to 2.1.5 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-93 The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.
CWE-117 The product constructs a log message from external input, but it does not neutralize or incorrectly neutralizes special elements when the message is written to a log file.

Attack-Flow Graph

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Executive Summary

This vulnerability affects the LogTape logging library's syslog structured data handling. It allows attackers to inject forged syslog records by exploiting improper neutralization of C0 control characters and unvalidated SD-NAME keys in structured data values. When includeStructuredData is enabled, attackers can terminate syslog frames and insert arbitrary log entries with manipulated headers or details.

Detection Guidance

Check if your LogTape library version is below 1.3.11, 2.0.14, or 2.1.5. Inspect syslog configurations for includeStructuredData set to true. Monitor logs for unexpected newline or control characters in structured data values.

Impact Analysis

This vulnerability can allow attackers to forge syslog records, manipulate log severity or facility levels, inject misleading entries to hide malicious activity, or break log parsers and SIEM correlation rules. It undermines the integrity of downstream log collectors and security information systems.

Compliance Impact

This vulnerability can compromise log integrity, which may violate compliance requirements for accurate and tamper-proof logging under standards like GDPR and HIPAA. Forged or manipulated logs could lead to non-compliance with audit and security logging mandates.

Mitigation Strategies
  • Upgrade LogTape to versions 1.3.11, 2.0.14, or 2.1.5 or later.
  • Disable includeStructuredData in syslog configurations if not required.
  • Validate and sanitize all structured data keys and values before logging.

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