CVE-2026-107349

Status: Awaiting AnalysisHigh (7.5)—

Severity7.5High · CVSS 3.1

Exploitation probability0.42 %higher than 35% of CVEs

Active exploitationNonot in the CISA catalog

Public exploitNot knownno public code found

An infinite loop in PgBouncer 1.20.0 through 1.26.0 allows an unauthenticated remote attacker to cause a denial of service. A StartupMessage whose options parameter contains an empty parameter name, such as "-c=", makes the ignore_startup_parameters list lookup loop forever. Because PgBouncer serves all clients from a single process, this saturates a CPU core and makes PgBouncer unresponsive to all clients until the process is restarted.

CVSS

Base score: 7.5
Version: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.42 %
Percentile among all scored CVEs: 35
Score date: 10/21/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1190 Exploit Public-Facing Applicationinitial access95 %
Primary impactT1499 Endpoint Denial of Serviceimpact90 %

Vector AV:N/PR:N/UI:N y bucle infinito con un StartupMessage malformado que satura la CPU y bloquea el proceso único de PgBouncer hasta reiniciarlo.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

ATT&CK mitigations that cover these techniques

Filter Network Traffic Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Application Isolation and Sandboxing

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Pgbouncer — Pgbouncer^AI

CWEs

CWE-400, CWE-835

References

Show 1 references

https://www.pgbouncer.org/changelog.html

Raw JSON (NVD)

Show

{
  "id": "CVE-2026-107349",
  "cveTags": [],
  "metrics": {
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      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-107349",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-10-16T20:19:04.558160Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "PgBouncer",
          "versions": [
            {
              "status": "affected",
              "version": "1.20.0",
              "lessThan": "1.26.1",
              "versionType": "semver"
            }
          ],
          "defaultStatus": "unaffected"
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  ],
  "published": "2026-10-14T18:17:25.557",
  "references": [
    {
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      "source": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007"
    }
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  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
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      "description": [
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  "descriptions": [
    {
      "lang": "en",
      "value": "An infinite loop in PgBouncer 1.20.0 through 1.26.0 allows an unauthenticated remote attacker to cause a denial of service. A StartupMessage whose options parameter contains an empty parameter name, such as \"-c=\", makes the ignore_startup_parameters list lookup loop forever. Because PgBouncer serves all clients from a single process, this saturates a CPU core and makes PgBouncer unresponsive to all clients until the process is restarted."
    }
  ],
  "lastModified": "2026-10-16T21:17:18.340",
  "sourceIdentifier": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007"
}