CVE-2026-6638
CVE-2026-6638 is a low-severity vulnerability in Postgresql with a CVSS 3.x base score of 3.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-89.
Key facts
- Severity: Low (CVSS 3.x base score 3.7)
- EPSS exploit prediction: 0% (8th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-30290
- Weakness: CWE-89
- Affected product: Postgresql
- Published:
- Last modified:
Description
SQL injection in PostgreSQL logical replication ALTER SUBSCRIPTION ... REFRESH PUBLICATION allows a subscriber table creator to execute arbitrary SQL with the subscription's publication-side credentials. The attack takes effect at the next REFRESH PUBLICATION. Within major versions 16, 17, and 18, minor versions before PostgreSQL 18.4, 17.10, and 16.14 are affected. Versions before PostgreSQL 16 are unaffected.
Frequently asked questions
- What is CVE-2026-6638?
- SQL injection in PostgreSQL logical replication ALTER SUBSCRIPTION ... REFRESH PUBLICATION allows a subscriber table creator to execute arbitrary SQL with the subscription's publication-side credentials. The attack takes effect at the next REFRESH PUBLICATION. Within major versions 16, 17, and 18, minor versions before PostgreSQL 18.4, 17.10, and 16.14 are affected. Versions before PostgreSQL 16 are unaffected.
- How severe is CVE-2026-6638?
- CVE-2026-6638 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
- Is CVE-2026-6638 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-6638?
- CVE-2026-6638 affects Postgresql. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-6638?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-6638 have an EU (EUVD) identifier?
- Yes. CVE-2026-6638 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30290.
- When was CVE-2026-6638 published?
- CVE-2026-6638 was published on 2026-05-14 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:*
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