CVE-2026-61818

HIGHPre-NVD 8.58.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 59% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
8.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

pg_partman is a PostgreSQL extension that manages partitioned tables by time or ID. Prior to 5.5.0, undo_partition() reads part_config.time_encoder as unrestricted text and interpolates it without identifier quoting into a dynamically executed SELECT statement. A role with partman_user access can store SQL rather than a function name, and the SQL executes with the privileges of the caller that invokes undo_partition(). The function is not part of the default background-worker path, which limits the automatic superuser escalation described by the related create-partition vulnerability, but a privileged caller can still have its available confidentiality, integrity, and availability permissions abused. This issue is fixed in version 5.5.0.

CVSS v3
8.5
EG Score
8.5(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity85% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
41%
KEV
Not listed

Published

September 18, 2026

Last Modified

September 24, 2026

Advisory Details (2)

Auto-updated Sep 18, 2026
Patch available. Sources: github_release, github.
github_release Patch Available

v5.5.0

Patch available: pgpartman/pg_partman v5.5.0

https://github.com/pgpartman/pg_partman/releases/tag/v5.5.0
github Patch Available

pg_partman SQL injection in undo partition time encoder · Advisory · pgpartman/pg_partman · GitHub

https://github.com/pgpartman/pg_partman/security/advisories/GHSA-fm3m-9fh7-mqfc

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 13× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-24 21:38 UTCEG score recompute
  2. 2026-09-24 01:25 UTCEG score recompute
  3. 2026-09-23 17:54 UTCEPSS rescore
  4. 2026-09-23 01:53 UTCEG score recompute
  5. 2026-09-22 02:20 UTCEG score recompute
  6. 2026-09-21 02:47 UTCEG score recompute
  7. 2026-09-20 20:16 UTCEPSS rescore
  8. 2026-09-20 03:14 UTCEG score recompute
  9. 2026-09-19 15:28 UTCEG score recompute
  10. 2026-09-19 14:25 UTCEG score recompute
  11. 2026-09-18 20:30 UTCEG score recompute
  12. 2026-09-18 19:54 UTCEG score recompute
  13. 2026-09-18 19:54 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-61818?
CVE-2026-61818 is a high vulnerability published on September 18, 2026. pgpartman is a PostgreSQL extension that manages partitioned tables by time or ID. Prior to 5.5.0, undopartition() reads partconfig.timeencoder as unrestricted text and interpolates it without identifier quoting into a dynamically executed SELECT statement. A role with partmanuser access can store…
When was CVE-2026-61818 disclosed?
CVE-2026-61818 was first published in the National Vulnerability Database on September 18, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-61818 actively exploited?
CVE-2026-61818 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 58.9% of all scored CVEs.
What is the CVSS score of CVE-2026-61818?
CVE-2026-61818 has a CVSS v3 base score of 8.5 (NVD).
How do I remediate CVE-2026-61818?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-61818, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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