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HIGH severity

CVE-2026-32286 — v2

HIGH

CVE-2026-32286 is a high-severity (CVSS 7.5) CWE-129 vulnerability in github.com/jackc/pgproto3/v2. No vendor fix is recorded yet; mitigation options are listed below.

Denial of service in github.com/jackc/pgproto3/v2

Also known asGHSA-jqcq-xjh3-6g23GO-2026-4518
Published
Mar 26, 2026
Updated
Sep 12, 2026
Affected
1 pkg
Patched
None yet
Exploits
None indexed
Exploitation data as of Sep 19, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

  • CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
  • CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-32286.

EPSS Exploitation Probability

via FIRST.org ↗
0.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs50th percentile — riskier than 50% of all scored CVEsHighest risk

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

How urgent is this, really

CVE-2026-32286 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.

Where this sits among everything scored

Of 377,238 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.

Real-World Exposure

1 pkg affected
🐹github.com/jackc/pgproto3/v2

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

The DataRow.Decode function fails to properly validate field lengths. A malicious or compromised PostgreSQL server can send a DataRow message with a negative field length, causing a slice bounds out of range panic.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/jackc/pgproto3/v2≥ 2.0.0No fix

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/jackc/pgproto3/v2, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    No patched version of github.com/jackc/pgproto3/v2 has shipped for CVE-2026-32286 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

  3. Mitigate without a patch

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-32286 can be triaged on real exposure rather than presence alone.

Tailored to CVE-2026-32286. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatImportant

The PostgreSQL server multicluster-globalhub-manager connects to is either provisioned by the operator itself or specified by the admin managing the deployment. To successfully exploit the vulnerability in this context the attacker would need to compromise the operator-deployed PostgreSQL server to force a crafted…

ProductFixed inAdvisory
Red Hat Enterprise Linux 10osbuild-composer-0:165.1-2.el10_2RHSA-2026:22450
Red Hat Enterprise Linux 9osbuild-composer-0:165.1-2.el9_8RHSA-2026:22714
Multicluster Global Hub 1.3.4multicluster-globalhub/multicluster-globalhub-agent-rhel9:1779210675RHSA-2026:22423
Multicluster Global Hub 1.4.5multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1779579439RHSA-2026:22347
Multicluster Global Hub 1.6.5multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1780167118RHSA-2026:23345
Red Hat Advanced Cluster Security 4.8advanced-cluster-security/rhacs-main-rhel8:1777307791RHSA-2026:11070
Red Hat Advanced Cluster Security 4.8advanced-cluster-security/rhacs-main-rhel8:1777307791RHSA-2026:11217
Red Hat multicluster global hub 1.5.3multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1778867753RHSA-2026:21769

Frequently Asked Questions

The DataRow.Decode function fails to properly validate field lengths. A malicious or compromised PostgreSQL server can send a DataRow message with a negative field length, causing a slice bounds out of range panic.
O3 Security · Impact-Aware SCA

Is CVE-2026-32286 in your dependencies?

O3 Security finds CVE-2026-32286 across Go dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.

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CVE-2026-32286: v2 (High 7.5) | O3 Security