{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2026:5ZSHHM4ENR2SJFNZMUXWSIFUGG","short_pith_number":"pith:5ZSHHM4E","schema_version":"1.0","canonical_sha256":"ee6473b3846c752495b9652f6920b4318b2f794bd4f6d501c250b4460ff93133","source":{"kind":"arxiv","id":"2606.18120","version":1},"attestation_state":"computed","paper":{"title":"Structural Role Injection in Handlebars-Templated LLM Prompts: Triple-Brace Interpolation, Delimiter Family, and the Limits of HTML Auto-Escaping","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.AI","cs.CL","cs.LG"],"primary_cat":"cs.CR","authors_text":"Mohammadreza Rashidi","submitted_at":"2026-06-16T16:21:43Z","abstract_excerpt":"Large language model applications build prompts from templates, and Handlebars is a widely used templating engine and the default prompt-template format in Microsoft Semantic Kernel. Its double-brace {{x}} expression HTML-escapes the interpolated value and is documented as the safe default; its triple-brace {{{x}}} expression inserts the value raw. We show that this choice silently governs an application's exposure to structural role injection, where attacker-controlled data carries chat role delimiters that forge a higher-privilege turn. A model-free analysis establishes the mechanism: Handle"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2606.18120","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CR","submitted_at":"2026-06-16T16:21:43Z","cross_cats_sorted":["cs.AI","cs.CL","cs.LG"],"title_canon_sha256":"14498dfd3f1db04312fa33ff3c47883b5f2ecfef6bea99f25f83a69a9c7f5398","abstract_canon_sha256":"9f47c695008f6bc9bd10994a5c13c313093100ed17756f0577f4d155211d69f0"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-19T16:10:48.876777Z","signature_b64":"jG0Z4ykkiv3xpkSbAq3/IgO+sgksbU0R0CPttH01xFw6d9kgRLBMlf6n9n0XLFesIjJ+8SU451CgeAG2Xjr0CA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ee6473b3846c752495b9652f6920b4318b2f794bd4f6d501c250b4460ff93133","last_reissued_at":"2026-06-19T16:10:48.876393Z","signature_status":"signed_v1","first_computed_at":"2026-06-19T16:10:48.876393Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Structural Role Injection in Handlebars-Templated LLM Prompts: Triple-Brace Interpolation, Delimiter Family, and the Limits of HTML Auto-Escaping","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.AI","cs.CL","cs.LG"],"primary_cat":"cs.CR","authors_text":"Mohammadreza Rashidi","submitted_at":"2026-06-16T16:21:43Z","abstract_excerpt":"Large language model applications build prompts from templates, and Handlebars is a widely used templating engine and the default prompt-template format in Microsoft Semantic Kernel. Its double-brace {{x}} expression HTML-escapes the interpolated value and is documented as the safe default; its triple-brace {{{x}}} expression inserts the value raw. We show that this choice silently governs an application's exposure to structural role injection, where attacker-controlled data carries chat role delimiters that forge a higher-privilege turn. A model-free analysis establishes the mechanism: Handle"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.18120","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2606.18120/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"2606.18120","created_at":"2026-06-19T16:10:48.876465+00:00"},{"alias_kind":"arxiv_version","alias_value":"2606.18120v1","created_at":"2026-06-19T16:10:48.876465+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.18120","created_at":"2026-06-19T16:10:48.876465+00:00"},{"alias_kind":"pith_short_12","alias_value":"5ZSHHM4ENR2S","created_at":"2026-06-19T16:10:48.876465+00:00"},{"alias_kind":"pith_short_16","alias_value":"5ZSHHM4ENR2SJFNZ","created_at":"2026-06-19T16:10:48.876465+00:00"},{"alias_kind":"pith_short_8","alias_value":"5ZSHHM4E","created_at":"2026-06-19T16:10:48.876465+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/5ZSHHM4ENR2SJFNZMUXWSIFUGG","json":"https://pith.science/pith/5ZSHHM4ENR2SJFNZMUXWSIFUGG.json","graph_json":"https://pith.science/api/pith-number/5ZSHHM4ENR2SJFNZMUXWSIFUGG/graph.json","events_json":"https://pith.science/api/pith-number/5ZSHHM4ENR2SJFNZMUXWSIFUGG/events.json","paper":"https://pith.science/paper/5ZSHHM4E"},"agent_actions":{"view_html":"https://pith.science/pith/5ZSHHM4ENR2SJFNZMUXWSIFUGG","download_json":"https://pith.science/pith/5ZSHHM4ENR2SJFNZMUXWSIFUGG.json","view_paper":"https://pith.science/paper/5ZSHHM4E","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2606.18120&json=true","fetch_graph":"https://pith.science/api/pith-number/5ZSHHM4ENR2SJFNZMUXWSIFUGG/graph.json","fetch_events":"https://pith.science/api/pith-number/5ZSHHM4ENR2SJFNZMUXWSIFUGG/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/5ZSHHM4ENR2SJFNZMUXWSIFUGG/action/timestamp_anchor","attest_storage":"https://pith.science/pith/5ZSHHM4ENR2SJFNZMUXWSIFUGG/action/storage_attestation","attest_author":"https://pith.science/pith/5ZSHHM4ENR2SJFNZMUXWSIFUGG/action/author_attestation","sign_citation":"https://pith.science/pith/5ZSHHM4ENR2SJFNZMUXWSIFUGG/action/citation_signature","submit_replication":"https://pith.science/pith/5ZSHHM4ENR2SJFNZMUXWSIFUGG/action/replication_record"}},"created_at":"2026-06-19T16:10:48.876465+00:00","updated_at":"2026-06-19T16:10:48.876465+00:00"}