CVE-2026-7597 Overview
CVE-2026-7597 is an insecure deserialization vulnerability in mem0ai mem0 versions up to 1.0.11. The flaw resides in the pickle.load and pickle.dump operations within mem0/vector_stores/faiss.py. Loading attacker-controlled pickle data triggers Python deserialization, which can lead to arbitrary object instantiation and code execution paths during unpickling. The issue is classified under [CWE-20] Improper Input Validation and is exploitable remotely under low-privilege conditions. A public exploit reference exists, and the maintainers have published a fix in commit 62dca096f9236010ca15fea9ba369ba740b86b7a.
Critical Impact
Remote attackers with low privileges can supply crafted pickle payloads to the FAISS vector store, triggering unsafe deserialization that compromises the integrity, confidentiality, and availability of the mem0 process.
Affected Products
- mem0ai mem0 versions up to and including 1.0.11
- Deployments using the FAISS vector store backend (mem0/vector_stores/faiss.py)
- Applications embedding mem0 as a memory layer for LLM agents
Discovery Timeline
- 2026-05-01 - CVE-2026-7597 published to NVD
- 2026-05-05 - Last updated in NVD database
Technical Details for CVE-2026-7597
Vulnerability Analysis
The vulnerability stems from mem0's reliance on Python's pickle module to persist and restore FAISS vector store state. The pickle.load call in mem0/vector_stores/faiss.py reconstructs arbitrary Python objects from serialized byte streams without validating their structure or origin. Python's pickle protocol invokes __reduce__ and similar dunder methods during unpickling, which allows a serialized payload to execute callables as part of object reconstruction. When an attacker controls the pickle file path or its contents, deserialization becomes a code execution primitive within the mem0 process.
The corresponding pickle.dump operation compounds the risk by producing files that downstream consumers may load implicitly. This vulnerability falls into the Insecure Deserialization category and maps to [CWE-20] Improper Input Validation. The EPSS probability is 0.058% at the 17.79 percentile.
Root Cause
The root cause is the use of an unsafe serialization format for persisting vector store data. Pickle is not a security boundary and treats input as trusted Python bytecode. mem0 did not validate, sign, or restrict the classes permitted during deserialization before invoking pickle.load.
Attack Vector
An attacker who can write to or substitute the FAISS index file consumed by mem0, or who can influence the file path passed to the loader, supplies a malicious pickle payload. When mem0 loads the FAISS store, the embedded reduce gadget executes during unpickling. The attack requires network reachability and low privileges, with no user interaction.
No verified proof-of-concept code is provided in the advisory. Refer to the GitHub Issue #3778 and GitHub Pull Request #4833 for technical context on the exploitation conditions.
Detection Methods for CVE-2026-7597
Indicators of Compromise
- Unexpected modifications to FAISS index files persisted by mem0 on disk.
- Child processes spawned by the Python interpreter hosting mem0 immediately after a vector store load.
- Outbound network connections from mem0 worker processes to unfamiliar destinations following memory restoration events.
- Pickle files in mem0 storage paths whose authorship or hash does not match the application's deployment baseline.
Detection Strategies
- Monitor calls to pickle.load originating from mem0/vector_stores/faiss.py and correlate with subsequent process or shell activity.
- Hash and baseline FAISS persistence files, and alert on out-of-band modifications.
- Inspect pickle byte streams for R (REDUCE), c (GLOBAL), and i (INST) opcodes that reference dangerous callables such as os.system, subprocess.Popen, or builtins.eval.
Monitoring Recommendations
- Log every load and dump operation against the FAISS vector store, including file path, size, and invoking user.
- Alert on Python processes hosting mem0 that execute non-Python child binaries.
- Track filesystem write events to mem0 data directories from any identity other than the application service account.
How to Mitigate CVE-2026-7597
Immediate Actions Required
- Upgrade mem0 to a release that includes commit 62dca096f9236010ca15fea9ba369ba740b86b7a.
- Restrict filesystem permissions on FAISS persistence directories to the mem0 service account only.
- Audit existing FAISS index files for unauthorized modification before reloading them in production.
- Isolate mem0 workers in least-privilege containers to limit blast radius if deserialization is abused.
Patch Information
The upstream fix is delivered in commit 62dca096f9236010ca15fea9ba369ba740b86b7a and tracked in GitHub Pull Request #4833. Review the GitHub Commit Details and the GitHub Repository for mem0 for the patched code path. Additional context is available in the VulDB Vulnerability #360550 entry.
Workarounds
- Replace pickle-based persistence with a safer format such as JSON, Protobuf, or FAISS's native write_index/read_index APIs where feasible.
- If pickle must be retained temporarily, sign FAISS index files with HMAC and verify the signature before calling pickle.load.
- Restrict the deserialization surface by overriding pickle.Unpickler.find_class to allow only an explicit allowlist of classes.
- Run mem0 in a sandbox with no outbound network access and a read-only root filesystem to contain post-exploitation activity.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
