High 8.6Published Aug 26, 2026

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

Updated under an hour ago (2026-10-19 11:10 UTC)

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It affects dahlia logtape. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for dahlia logtape

Exploited in the last 30 days

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.

CVSS: 8.6 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Weakness (CWE): CWE-93, CWE-117
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Aug 27, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

dahlia logtape dahlia:logtape (from the name)	before 1.3.11; from 2.0.0, < 2.0.14; from 2.1.0, < 2.1.5	CNA record

References

https://github.com/dahlia/logtape/security/advisories/GHSA-8h6h-x5pq-56fqx-refsource-confirm
https://github.com/dahlia/logtape/commit/7a6e5b9ddf7915edfff78fa129bc17c979b2a623x-refsource-misc
https://github.com/dahlia/logtape/releases/tag/1.3.11x-refsource-misc
https://github.com/dahlia/logtape/releases/tag/2.0.14x-refsource-misc
https://github.com/dahlia/logtape/releases/tag/2.1.5x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.