{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-77937 exists.","fix":"No fix has been published for CVE-2026-77937 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-77937 is a high-severity vulnerability in letta-ai letta, published on 20 Oct 2026."},"fix_prompt":"Check this codebase for CVE-2026-77937 and fix it if it is affected.\n\nWhat it is: CVE-2026-77937 is a high-severity vulnerability in letta-ai letta, published on 20 Oct 2026. \nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-77937 exists.\n\nAffected product: letta-ai letta. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-77937/ (Markdown: https://insights.sbomify.com/CVE-2026-77937/index.md)","id":"CVE-2026-77937","markdown":"https://insights.sbomify.com/CVE-2026-77937/index.md","name":"CVE-2026-77937","record":{"aliases":["GHSA-8p6h-849r-ww4h"],"analysis":null,"analysis_generated_by":null,"assigner":"VulnCheck","cpe":[],"cvss":{"score":8.6,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-639","name":"Authorization Bypass Through User-Controlled Key"}],"description":"Letta through 0.16.8 contains an authentication bypass vulnerability that allows API callers to impersonate other users by supplying a self-asserted user_id HTTP header. Attackers can set user_id to another tenant's ID, even with LETTA_SERVER_SECURE enabled, to read and modify that user's agents, memory and configuration.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":false,"headline":"Letta through 0.16.8 Cross-Tenant Impersonation via user_id Header","id":"CVE-2026-77937","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":null,"year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"Letta through 0.16.8 Credential Exposure via Tool Sandbox Environment Inheritance","id":"CVE-2026-77938"},"packages":[],"prev":{"headline":"Letta through 0.16.8 Insecure Default Configuration Unauthenticated API and PostgreSQL Access","id":"CVE-2026-77936"},"products":["letta"],"published":"2026-10-20","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-10-20","vendors":["letta-ai"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-77937/"}