| Title | ggml-org llama.cpp confirmed commit e15efe0 CWE-617 (Reachable Assertion) |
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| Description | ## Summary
The jinja parser constructs a `filter_expression` without validating the pipe `|` operand type. When the operand is a literal (e.g., integer `9`), the `chk_type` assertion fires → `abort()`. 7-byte payload (`{{9|9|{`). Reachable if server processes user-specified `chat_template` parameters.
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## Exploit / PoC
**File:** `poc-020-jinja-assert-abort.bin` (7 bytes: `{{9|9|{`)
**Reproduction:**
```
Input: {{9|9|{
→ chk_type assertion failed in runtime.h:126
→ abort()
```
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## Suggested Fix
Validate filter operand type in `parse_filter_expression()`.
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## Discovery
- **Tool:** Crucible fuzzer (jinja campaign)
- **Date:** 2026-04-03
- **Confirmed on:** llama.cpp commit e15efe0, Fedora 43 x86_64 |
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| Source | ⚠️ https://drive.proton.me/urls/R8D8NGZ6Z0#C2cVZYn5z1Xc |
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| User | m00dy (UID 97162) |
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| Submission | 04/07/2026 21:23 (4 months ago) |
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| Moderation | 08/02/2026 20:58 (4 months later) |
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| Status | Accepted |
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| VulDB entry | 385409 [ggml-org llama.cpp e15efe0 Jinja Minja Template Parser common/jinja/parser.cpp assertion] |
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| Points | 20 |
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