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pgAdmin 4 CVE-2026-7818

| EUVD-2026-29086 HIGH
Deserialization of Untrusted Data (CWE-502)
2026-05-11 PostgreSQL GHSA-4rhg-h8f2-v4jm
RCE Python Deserialization
7.3
CVSS 4.0
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CVSS VectorNVD

CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

5
Patch available
May 11, 2026 - 17:17 EUVD
Re-analysis Queued
May 11, 2026 - 16:22 vuln.today
cvss_changed
CVSS changed
May 11, 2026 - 16:22 NVD
7.0 (HIGH) 7.3 (HIGH)
Analysis Generated
May 11, 2026 - 15:46 vuln.today
CVE Published
May 11, 2026 - 14:35 nvd
HIGH 7.0

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 1 pypi packages depend on pgadmin4 (1 direct, 0 indirect)

Ecosystem-wide dependent count for version 9.15.

DescriptionNVD

Deserialization of untrusted data (CWE-502) in pgAdmin 4 FileBackedSessionManager.

The session manager performed unsafe deserialization of session-file contents (using Python's standard object-serialization module) before performing any HMAC integrity check. Any file dropped into the sessions directory was deserialized unconditionally. An authenticated user with write access to the sessions directory (whether by misconfiguration or in combination with another path-traversal flaw) could plant a crafted serialized payload to achieve operating-system level remote code execution under the pgAdmin process identity.

Fix prepends a 64-byte hex SHA-256 HMAC over the session body, computed with SECRET_KEY, and verifies it via hmac.compare_digest before any deserialization. The check is raised (rather than asserted) on empty SECRET_KEY so it is not stripped under -O.

This issue affects pgAdmin 4: before 9.15.

AnalysisAI

Unsafe Python pickle deserialization in pgAdmin 4 FileBackedSessionManager allows authenticated local users with session-directory write access to execute arbitrary code as the pgAdmin process. The vulnerability arises from deserializing session files before validating their HMAC signature, enabling payload injection through crafted pickle objects. …

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RemediationAI

Within 24 hours: Inventory all pgAdmin 4 deployments and confirm current versions. Within 7 days: Upgrade pgAdmin 4 to version 9.15 or later; verify session directory permissions restrict write access to the pgAdmin process owner only. …

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Vendor StatusVendor

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CVE-2026-7818 vulnerability details – vuln.today
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