{"id":"CVE-2026-71492","title":"Banks generates meaningful LLM prompts using a simple template language","summary":"Banks generates meaningful LLM prompts using a simple template language. Prior to version 2.4.5, DirectoryPromptRegistry.set() in src/banks/registries/directory.py interpolates attacker-controlled Prompt.name and Prompt.version values in…","severity":"medium","cwe":["CWE-22"],"vendor":"banks","product":"banks","affected":["banks < 2.4.5"],"patched":["banks 2.4.5"],"published":"2026-08-20","updated":"2026-09-18","sourceUpdated":"2026-09-18T20:09:01.757","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-71492","references":[{"url":"https://github.com/masci/banks/commit/a215f6d779966945c56e0af5abed1ae5916fd9d3","label":"security-advisories@github.com"},{"url":"https://github.com/masci/banks/pull/77","label":"security-advisories@github.com"},{"url":"https://github.com/masci/banks/releases/tag/v2.4.5","label":"security-advisories@github.com"},{"url":"https://github.com/masci/banks/security/advisories/GHSA-x8wg-4xgc-vr54","label":"security-advisories@github.com"},{"url":"https://github.com/masci/banks/security/advisories/GHSA-x8wg-4xgc-vr54","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71492"},{"url":"https://github.com/masci/banks"},{"url":"https://pypi.org/project/banks"},{"url":"https://github.com/advisories/GHSA-x8wg-4xgc-vr54"}],"tags":["nvd","osv","pip","ghsa"],"epss":0.00398,"epssPercentile":0.33846,"aliases":["GHSA-x8wg-4xgc-vr54","PYSEC-2026-3810"],"ecosystem":"pip","ingestedAt":"2026-09-02T14:45:29.970Z","slug":"CVE-2026-71492","body":"## Overview\n\nBanks generates meaningful LLM prompts using a simple template language. Prior to version 2.4.5, DirectoryPromptRegistry.set() in src/banks/registries/directory.py interpolates attacker-controlled Prompt.name and Prompt.version values into a Path without canonicalization or containment validation. Relative traversal such as ../victim/foo and an absolute Prompt.name can escape or discard the configured registry root, while overwrite=True permits replacement of existing target files. The poisoned name is persisted in index.json and reconstructed by _load(), allowing the out-of-root path to survive later registry loads. An application that forwards request data into these fields can therefore write Prompt.raw bytes to attacker-chosen paths writable by the application process. This issue is fixed in version 2.4.5.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-71492)\n\nAffected packages:\n\n- `banks < 2.4.5`\n\nPatched in:\n\n- `banks 2.4.5`\n\nSource: https://osv.dev/vulnerability/GHSA-x8wg-4xgc-vr54","depth":"sunlit","depthScore":28,"depthScoreParts":{"impact":27.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}