{"answers":{"affected":"6 open source packages ship an affected version, including @logtape/syslog.","exploited":"There is no known exploitation of CVE-2026-54511 in the wild and no public exploit code.","fix":"Upgrade @logtape/syslog to a fixed version for your release line: 1.3.11, 2.0.14 or 2.1.5.","what":"CVE-2026-54511 is a high-severity vulnerability in dahlia logtape, published on 26 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-54511 and fix it if it is affected.\n\nWhat it is: CVE-2026-54511 is a high-severity vulnerability in dahlia logtape, published on 26 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-54511 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- @logtape/syslog (npm): affected all versions; fixed in 1.3.11\n- @logtape/syslog (npm): affected all versions; fixed in 1.3.11\n- @logtape/syslog (npm): affected from 2.0.0; fixed in 2.0.14\n- @logtape/syslog (npm): affected from 2.0.0; fixed in 2.0.14\n- @logtape/syslog (npm): affected from 2.1.0; fixed in 2.1.5\n- @logtape/syslog (npm): affected from 2.1.0; fixed in 2.1.5\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-54511/ (Markdown: https://insights.sbomify.com/CVE-2026-54511/index.md)","id":"CVE-2026-54511","markdown":"https://insights.sbomify.com/CVE-2026-54511/index.md","name":"CVE-2026-54511","record":{"aliases":["GHSA-8h6h-x5pq-56fq"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_modify","security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"JavaScript logging library","requires_auth":"none","summary":"Attackers can forge syslog records by injecting control characters or invalid keys when structured data logging is enabled, compromising SIEM integrity.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":8.6,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-93","name":"Improper Neutralization of CRLF Sequences"},{"id":"CWE-117","name":"Improper Output Neutralization for Logs"}],"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.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"@logtape/syslog: syslog log injection via unescaped control characters and unvalidated SD-NAME keys","id":"CVE-2026-54511","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"other","year":"2026"},"n_packages":6,"n_references":5,"next":{"headline":"jackson-databind: PolymorphicTypeValidator bypass via generic type parameters allows arbitrary class instantiation","id":"CVE-2026-54512"},"packages":[{"ecosystem":"npm","fixed":["1.3.11"],"introduced":["0"],"last_affected":[],"package":"@logtape/syslog","purl":null,"source":"GHSA-8h6h-x5pq-56fq"},{"ecosystem":"npm","fixed":["1.3.11"],"introduced":["0"],"last_affected":[],"package":"@logtape/syslog","purl":"pkg:npm/%40logtape/syslog","source":"GHSA-8h6h-x5pq-56fq"},{"ecosystem":"npm","fixed":["2.0.14"],"introduced":["2.0.0"],"last_affected":[],"package":"@logtape/syslog","purl":null,"source":"GHSA-8h6h-x5pq-56fq"},{"ecosystem":"npm","fixed":["2.0.14"],"introduced":["2.0.0"],"last_affected":[],"package":"@logtape/syslog","purl":"pkg:npm/%40logtape/syslog","source":"GHSA-8h6h-x5pq-56fq"},{"ecosystem":"npm","fixed":["2.1.5"],"introduced":["2.1.0"],"last_affected":[],"package":"@logtape/syslog","purl":null,"source":"GHSA-8h6h-x5pq-56fq"},{"ecosystem":"npm","fixed":["2.1.5"],"introduced":["2.1.0"],"last_affected":[],"package":"@logtape/syslog","purl":"pkg:npm/%40logtape/syslog","source":"GHSA-8h6h-x5pq-56fq"}],"prev":{"headline":"Speakr: CSRF bypass via unauthenticated API token parameter in csrf_exempt_for_api_tokens hook","id":"CVE-2026-54510"},"products":["logtape"],"published":"2026-08-26","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-27","vendors":["dahlia"]},"summary":"Attackers can forge syslog records by injecting control characters or invalid keys when structured data logging is enabled, compromising SIEM integrity.","url":"https://insights.sbomify.com/CVE-2026-54511/"}