7.8

CVE-2026-7818: pgAdmin 4: Unsafe deserialization (CWE-502) in file-backed session manager leads to remote code execution

Analyzed
AliasesGHSA-4rhg-h8f2-v4jmPYSEC-2026-2865CGA-82wq-4qx6-hpch
Published 11-05-2026Last modified 11-05-2026

Vulnerability summary

CVE-2026-7818 is a high (CVSS 7.8) Deserialization of Untrusted Data vulnerability in pgadmin pgadmin_4. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.6% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.3, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.13%
0%100%
Low · -0.22 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 2
OPENSUSE-SU-2026:11508-1CGA-XV69-M2FC-3FWG

Timeline

  1. 11-05-2026
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

Decrease -0.22 pp

From 0.35% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard1 product
  • pgadmin4< 9.15-r0 | < 9.15-r1
Pgadmin1 product
Pgadmin.org1 product
PyPI1 product
  • pgadmin4< 9.15

4 vendors · 4 products

References

7 links