CVE-2026-116575 (GCVE-0-2026-116575)

Vulnerability from cvelistv5 – Published: 2026-10-26 20:15 – Updated: 2026-10-26 20:15
VLAI
Title
Mem0: Cross-tenant conversation leak via unescaped delimiter collision in session-scope key (_build_session_scope)
Summary
Mem0 provides persistent memory infrastructure for AI agents and applications. Prior to Python SDK 2.0.18 and TypeScript SDK 3.1.6, _build_session_scope() in mem0/memory/main.py and Memory.buildSessionScope() in the TypeScript SDK join caller-controlled user_id, agent_id, and run_id values using unescaped & and = delimiters. A caller can embed another scope component in a controlled identifier so that distinct tenant tuples produce the same session_scope key. Memory.add(), AsyncMemory.add(), and the REST POST /memories flow use that key to read and save recent raw messages, allowing cross-tenant conversation disclosure and eviction or interleaving of another tenant's history. This issue is fixed in Python SDK 2.0.18 and TypeScript SDK 3.1.6.
Severity
6.3 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
CWE
  • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-863 - Incorrect Authorization
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7797 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
mem0ai mem0 Affected: < 2.0.18
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "mem0",
          "vendor": "mem0ai",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.0.18"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Mem0 provides persistent memory infrastructure for AI agents and applications. Prior to Python SDK 2.0.18 and TypeScript SDK 3.1.6, _build_session_scope() in mem0/memory/main.py and Memory.buildSessionScope() in the TypeScript SDK join caller-controlled user_id, agent_id, and run_id values using unescaped \u0026 and = delimiters. A caller can embed another scope component in a controlled identifier so that distinct tenant tuples produce the same session_scope key. Memory.add(), AsyncMemory.add(), and the REST POST /memories flow use that key to read and save recent raw messages, allowing cross-tenant conversation disclosure and eviction or interleaving of another tenant\u0027s history. This issue is fixed in Python SDK 2.0.18 and TypeScript SDK 3.1.6."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-200",
              "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-26T20:15:01.875Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/mem0ai/mem0/security/advisories/GHSA-5324-3w58-qpp2",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/mem0ai/mem0/security/advisories/GHSA-5324-3w58-qpp2"
        },
        {
          "name": "https://github.com/mem0ai/mem0/pull/6892",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/mem0ai/mem0/pull/6892"
        },
        {
          "name": "https://github.com/mem0ai/mem0/commit/71f2ebefa3494da21550fb525216818776cde67f",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/mem0ai/mem0/commit/71f2ebefa3494da21550fb525216818776cde67f"
        },
        {
          "name": "https://github.com/mem0ai/mem0/releases/tag/ts-v3.1.6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/mem0ai/mem0/releases/tag/ts-v3.1.6"
        },
        {
          "name": "https://github.com/mem0ai/mem0/releases/tag/v2.0.18",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/mem0ai/mem0/releases/tag/v2.0.18"
        }
      ],
      "source": {
        "advisory": "GHSA-5324-3w58-qpp2",
        "discovery": "UNKNOWN"
      },
      "title": "Mem0: Cross-tenant conversation leak via unescaped delimiter collision in session-scope key (_build_session_scope)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-116575",
    "datePublished": "2026-10-26T20:15:01.875Z",
    "dateReserved": "2026-10-26T15:03:39.035Z",
    "dateUpdated": "2026-10-26T20:15:01.875Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "mem0",
                "vendor": "mem0ai",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 2.0.18"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Mem0 provides persistent memory infrastructure for AI agents and applications. Prior to Python SDK 2.0.18 and TypeScript SDK 3.1.6, _build_session_scope() in mem0/memory/main.py and Memory.buildSessionScope() in the TypeScript SDK join caller-controlled user_id, agent_id, and run_id values using unescaped \u0026 and = delimiters. A caller can embed another scope component in a controlled identifier so that distinct tenant tuples produce the same session_scope key. Memory.add(), AsyncMemory.add(), and the REST POST /memories flow use that key to read and save recent raw messages, allowing cross-tenant conversation disclosure and eviction or interleaving of another tenant\u0027s history. This issue is fixed in Python SDK 2.0.18 and TypeScript SDK 3.1.6."
          }
        ],
        "id": "CVE-2026-116575",
        "lastModified": "2026-10-26T21:18:13.360",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "LOCAL",
                "availabilityImpact": "NONE",
                "baseScore": 6.3,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 1.0,
              "impactScore": 5.2,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-26T21:18:13.360",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/mem0ai/mem0/commit/71f2ebefa3494da21550fb525216818776cde67f"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/mem0ai/mem0/pull/6892"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/mem0ai/mem0/releases/tag/ts-v3.1.6"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/mem0ai/mem0/releases/tag/v2.0.18"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/mem0ai/mem0/security/advisories/GHSA-5324-3w58-qpp2"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Received",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-200"
              },
              {
                "lang": "en",
                "value": "CWE-863"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
      }
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.