CVE-2026-7818

Description

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.

How to fix CVE-2026-7818

To remediate CVE-2026-7818, upgrade the affected package to a fixed version below.

• —upgrade to 9.15 or later

Is CVE-2026-7818 being exploited?

Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.

Affected packages (1)

• from 0, < 9.15

CVSS scores

References (4)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-7818
• PATCHgithub.com/pgadmin-org/pgadmin4
• WEBgithub.com/pgadmin-org/pgadmin4/commit/30a890337
• WEBgithub.com/pgadmin-org/pgadmin4/issues/9901