vulnerability / NVI-00014188 / Revision 3
Banks: Path traversal in `DirectoryPromptRegistry.set()` allows arbitrary file write outside the registry root
GitHub lists this reviewed advisory for banks. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
0.474%
FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.41104. Missing scores are unknown.
As of · FIRST EPSS
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
banks
source listed< 2.4.5
## Summary `DirectoryPromptRegistry.set()` interpolates the attacker-controllable `Prompt.name` into a `Path` expression with no canonicalization. An application that derives the prompt name from request data lets a caller write attacker-controlled bytes outside the configured registry directory. ## Details `src/banks/registries/directory.py:44` ```python prompt_file = path / f"{prompt.name}.{prompt.version}.jinja" prompt_file.write_text(prompt.raw) ``` Two failure modes: 1. **Relative traversal.** `name="../victim/foo"` resolves to `/../victim/foo.0.jinja` — outside the configured root. 2. **Absolute-path bypass.** `pathlib` documents that `Path("/a") / Path("/b")` returns `Path("/b")`. So `name="/abs/path"` discards the registry root entirely; the registry is never consulted. The poisoned `name` is then persisted to `index.json`, so the out-of-root path keeps reconstructing on later `_load()` calls (`directory.py:135-141`). With `overwrite=True`, existing files at the target path are replaced. ## Proof of Concept ```python import tempfile from pathlib import Path from banks import Prompt from banks.registries import DirectoryPromptRegistry work = Path(tempfile
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. FIRST EPSS
A fixed release is not deployment evidence.
Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
Each assertion retains its source. Mirrored records may repeat one underlying publisher; additional links are not independent corroboration.
- GHSA-x8wg-4xgc-vr54 ↗
GitHub Advisory Database · vendor advisory
Observed . GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.
- CVE-2026-71492 ↗
FIRST EPSS · official catalog
Observed . FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.
Public revision history
Only published revisions appear here. Routine fetches do not create a material-change event.
- Revision 3 ·
Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.
- Revision 2 ·
Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.
- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.