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

Quick assessment

Affected
dahlia logtape
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LogTape 是一个无侵入式日志库。在 1.3.11、2.0.14 和 2.1.5 之前的版本中，@logtape/syslog 包中 里的 函数未能中和结构化数据值中的 C0 控制字符（Unicode U+0000 至 U+001F），同时 函数在插入属性键时未验证其是否符合 RFC 5424 中 SD-NAME 的文法要求。 当 设为 时，攻击者可控制的换行符可以终止 RFC 6587 定义的透明性 TCP syslog 帧，从而使后续的字节被解析为伪造的 RFC 5424 记录；此外，若属性键中包含右方括号

CVSS 8.6 · High

Possible ATT&CK Techniques 2 AI

T1565 · Data Manipulation T1119.002

Affected Version Matrix 3

VendorProduct Version RangeStatus
dahlia logtape < 1.3.11 affected
>= 2.0.0, < 2.0.14 affected
>= 2.1.0, < 2.1.5 affected
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I. Basic Information for CVE-2026-54511

Vulnerability Information
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Vulnerability Title
@logtape/syslog: syslog log injection via unescaped control characters and unvalidated SD-NAME keys
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
dahlia logtape < 1.3.11 -

II. Public POCs for CVE-2026-54511

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9171 chars
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III. Intelligence Information for CVE-2026-54511

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Patches & Fixes for CVE-2026-54511 (1)

Vendor Advisories for CVE-2026-54511 (1)

Vendor Pages for CVE-2026-54511 (3)

IV. Related Vulnerabilities

Same vendor: dahlia
Same weakness: CWE-93

V. Comments for CVE-2026-54511

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