GHSA-4rhg-h8f2-v4jm

Suggest an improvement
Source
https://github.com/advisories/GHSA-4rhg-h8f2-v4jm
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-4rhg-h8f2-v4jm/GHSA-4rhg-h8f2-v4jm.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-4rhg-h8f2-v4jm
Aliases
Downstream
CGA (4)
Published
2026-05-11T18:31:44Z
Modified
2026-09-10T03:50:45Z
Severity
  • 7.0 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • 7.3 (High) CVSS_V4 - 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 CVSS Calculator
Summary
pgAdmin 4 has deserialization of untrusted data in its FileBackedSessionManager
Details

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.

Database specific 
{
    "cwe_ids":  [
        "CWE-502"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-05-18T15:12:48Z",
    "nvd_published_at":  "2026-05-11T16:17:38Z",
    "severity":  "HIGH"
}
References

Affected packages

PyPI / pgadmin4

Package

Name
pgadmin4
View open source insights on deps.dev
Purl
pkg:pypi/pgadmin4

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
9.15

Affected versions

4.*
4.20
4.22
4.23
4.24
4.25
4.26
4.27
4.28
4.29
4.30
5.*
5.0
5.1
5.2
5.3
5.4
5.5
5.6
5.7
6.*
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
6.10
6.11
6.12
6.13
6.14
6.15
6.16
6.17
6.18
6.19
6.20
6.21
7.*
7.0
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
8.*
8.0
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
8.9
8.10
8.11
8.12
8.13
8.14
9.*
9.0
9.1
9.2
9.3
9.4
9.5
9.6
9.7
9.8
9.9
9.10
9.11
9.12
9.13
9.14

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-4rhg-h8f2-v4jm/GHSA-4rhg-h8f2-v4jm.json"