Cause (Documented platform behavior): Security hardening: object node mapping uses a restricted unpickler to prevent arbitrary code execution from persist directories.
Fix status: documented_behavior
Unknowns:
- First llama-index-core version with the restricted unpickler
Other error fragments:
- Unable to load from persist dir. The object_node_mapping cannot be loaded.
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/run-llama/llama_index/169e450aa54d26ed3e0536b1a0f1ea537871aa5d/llama-index-core/llama_index/core/objects/base.py (official_docs, unknown, documented_behavior): ObjectIndex.from_persist_dir raises "Unable to load from persist dir. The object_node_mapping cannot be loaded." when the mapping fails to load.
- https://raw.githubusercontent.com/run-llama/llama_index/169e450aa54d26ed3e0536b1a0f1ea537871aa5d/llama-index-core/llama_index/core/objects/base_node_mapping.py (official_docs, unknown, documented_behavior): _RestrictedUnpickler.find_class raises UnpicklingError "Refusing to unpickle ... class not in allowlist" for classes outside _SAFE_PICKLE_CLASSES; loading failures surface as "Unable to load from persist dir. The object_node_mapping cannot be loaded."
Search phrasings: llamaindex Refusing to unpickle class not in allowlist; llama index object_node_mapping cannot be loaded; ObjectIndex from_persist_dir error
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Previously persisted ObjectIndex (e.g. tool retrieval index) no longer loads after upgrade.
- Context
- Product: LlamaIndex Component: SimpleObjectNodeMapping restricted unpickler Operation: ObjectIndex.from_persist_dir(...) / load object node mapping containing custom objects Affected versions: unknown Environment: unknown Exception: pickle.UnpicklingError, Exception Packages: llama-index-core source checked at 0.14.25 Trigger: Persisted mapping pickle contains classes outside the small allowlist (builtins, SimpleObjectNodeMapping), e.g. custom objects or tool instances.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- class not in allowlist. If you need to load custom object types, use a purpose-built serialization format instead of pickle.
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [LlamaIndex ObjectIndex persistence] pickle.UnpicklingError "Refusing to unpickle 'module.Class': class not in allowlist" loading object_node_mapping from persist dir
Recommended action: Rebuild the ObjectIndex from code at startup instead of persisting arbitrary objects, or persist only serializable data and reconstruct objects.
Option: Reconstruct object mappings from code [evidence: documented_workaround]
Applies when: ObjectIndex with custom objects/tools
Steps:
1. obj_index = ObjectIndex.from_objects(tools, index_cls=VectorStoreIndex) at startup
Expected: No unpickling of custom classes
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 1e4cfa42-5e4e-41fc-aacc-54e34075fab7
- Proposed action
- Recommended action: Rebuild the ObjectIndex from code at startup instead of persisting arbitrary objects, or persist only serializable data and reconstruct objects. Option: Reconstruct object mappings from code [evidence: documented_workaround] Applies when: ObjectIndex with custom objects/tools Steps: 1. obj_index = ObjectIndex.from_objects(tools, index_cls=VectorStoreIndex) at startup Expected: No unpickling of custom classes
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.