High [CVE-2026-73515] Memory Disclosure and Denial of Service via Malformed FlatGeobuf Buffer
This high-severity Red Hat Linux advisory covers CVE-2026-73515 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat package: postgresql16-postgis.
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Summary
PostGIS before 3.7.0beta2 contains an out-of-bounds read vulnerability that allows attackers to cause memory disclosure or a server crash by supplying a malformed FlatGeobuf buffer.
The FlatGeobuf property metadata decoder verifies that a string length field is present but fails to verify that the subsequent string body is contained within the supplied buffer before materializing it into a SQL-visible value, enabling memory disclosure or denial of service. A flaw was found in PostGIS.
This can lead to sensitive information disclosure or a denial of service. Red Hat severity: Important — CVSS 8.1 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H).
Weakness: CWE-125. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9.
Red Hat fixing advisory: RHSA-2026:65899.
Affected products named by the advisory: Red Hat package: postgresql16-postgis; Red Hat package: postgresql18-postgis.
- < 3.7.0beta2
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
- postgresql16-postgis-0:3.5.3-4.el10_2.1
- RHSA-2026:65899
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
Mitigation
Upgrade to a fixed release: postgresql16-postgis-0:3.5.3-4.el10_2.1, RHSA-2026:65899. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
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