libpg_query memory leak

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

7.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N · score source

EPSS

• CVE-2018-18482: 1.16% estimated exploitation activity in the next 30 days; percentile 67.17 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

An issue was discovered in libpgquery 10-1.0.2. There is a memory leak in pgqueryrawparse in pgqueryparse.c, which might lead to a denial of service.

Published by the source

13 May 2022, 01:50 UTC

Last modified by the source

7 Jul 2026, 11:56 UTC

Source last checked

26 Oct 2026, 13:30 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-vm3q-58wm-2r2x

2. Revision 2 · amended · 25 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-vm3q-58wm-2r2x

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# Patch Next advisory brief: CVE-2018-18482

Advisory: libpg_query memory leak
IDs: CVE-2018-18482, GHSA-vm3q-58wm-2r2x
Record: https://patchnext.com/advisories/cve-2018-18482 (revision 3, source checked 26 Oct 2026, 13:30 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: pglast 0.28; pg-query 0.28. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI pglast: affected < 0.28; fixed in 0.28
- PyPI pg-query: affected < 0.28; fixed in 0.28

## Suggested inspection (read-only)
- `python -m pip show pglast`: prints the installed version. Run with the environment that serves production active.
- `python -m pip show pg-query`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on pglast, pg-query.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-vm3q-58wm-2r2x (OSV record GHSA-vm3q-58wm-2r2x lists affected ranges: PyPI pg-query >=0 =0 <0.28 (fixed))
- Verified: https://github.com/advisories/GHSA-vm3q-58wm-2r2x (GitHub-reviewed advisory GHSA-vm3q-58wm-2r2x lists affected ranges: PyPI pg-query >=0 =0 <0.28)

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