High
Letta through 0.16.8 Credential Exposure via Tool Sandbox Environment Inheritance
Type: advisorySources: OSV
Letta through 0.16.8 contains an information disclosure vulnerability that allows users running tools to read server secrets because LocalSandbox subprocesses inherit the full server environment. Attackers can run code via POST /v1/tools/run or custom tools to read LETTA_PG_URI, POSTGRES_PASSWORD, and provider API keys, then access cross-tenant database data.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-77938
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 08:21 UTC · Revision 1
Source evidence
Letta through 0.16.8 Credential Exposure via Tool Sandbox Environment Inheritance
core-osv · Original sourcePublished 20 Oct 2026, 00:46 UTC
Letta through 0.16.8 contains an information disclosure vulnerability that allows users running tools to read server secrets because LocalSandbox subprocesses inherit the full server environment. Attackers can run code via POST /v1/tools/run or custom tools to read LETTA_PG_URI, POSTGRES_PASSWORD, and provider API keys, then access cross-tenant database data.
osv:CVE-2026-77938
Complete source record
{
"id": "d10fd98ddaa52b4cd8860d2a0e9f9475a0885058666663727fa033f8ef5eb4ee",
"url": "https://osv.dev/vulnerability/CVE-2026-77938",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Letta through 0.16.8 Credential Exposure via Tool Sandbox Environment Inheritance",
"summary": "Letta through 0.16.8 contains an information disclosure vulnerability that allows users running tools to read server secrets because LocalSandbox subprocesses inherit the full server environment. Attackers can run code via POST /v1/tools/run or custom tools to read LETTA_PG_URI, POSTGRES_PASSWORD, and provider API keys, then access cross-tenant database data.",
"evidence": "osv:CVE-2026-77938",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-77938",
"aliases": [
"CVE-2026-77938"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/letta-ai/letta",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "1131535716e8a31c9a437f8695e25ac98f203a24"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
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{
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],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
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{
"range": [
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{
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"source": "DESCRIPTION"
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77938.json"
}
}
],
"modified": "2026-10-28T02:30:33.786592979Z",
"provider": "osv",
"references": [
"https://pypi.org",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77938.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-77938",
"https://www.vulncheck.com/advisories/letta-through-0.16.8-credential-exposure-via-tool-sandbox-environment-inheritance",
"https://github.com/letta-ai/letta",
"https://github.com/letta-ai/letta/blob/1131535716e8a31c9a437f8695e25ac98f203a24/letta/services/tool_sandbox/base.py#L487",
"https://www.lasso.security/vulnerability-database/cve-2026-77938"
],
"provider_metadata": {
"cwe_ids": [
"CWE-526"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77938.json"
}
},
"related_cves": [
{
"value": "CVE-2026-77938",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 501105,
"published_at": "2026-10-20T00:46:15.564+00:00"
}