RHSA-2026:83843

Vulnerability from csaf_redhat - Published: 2026-10-16 20:27 - Updated: 2026-10-17 10:58
Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Important
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs: pgbouncer: * pgbouncer-1.26.1-1.hum1 (aarch64, s390x, x86_64) * pgbouncer-1.26.1-1.hum1.src (src)
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2026-107348

A flaw was found in PgBouncer. An integer overflow in the message buffer growth logic allows a remote attacker to cause a Denial of Service (DoS) when a large maximum packet size is configured. By sending a specially crafted packet header declaring an excessively large length, an attacker can trigger an infinite loop in the buffer calculation. Because PgBouncer handles connections in a single process, this loop consumes a full CPU core and halts all pooled connections until the process is restarted.

5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-190 - Integer Overflow or Wraparound
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@s390x —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@src —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Moderate
CVE-2026-107349

A flaw was found in PgBouncer. An unauthenticated remote attacker can cause a Denial of Service (DoS) by sending a startup message that contains an empty parameter name in its options. This causes PgBouncer to enter an infinite loop during startup parameter processing, consuming high CPU resources and rendering the service unresponsive to all clients until restarted.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Affected products
Fixed 4 products, the same list as for CVE-2026-107348
Threats
Impact Important
CVE-2026-107350

A flaw was found in PgBouncer. An improper authentication vulnerability allows a remote attacker possessing valid credentials for any listed user to impersonate any other user configured with Salted Challenge Response Authentication Mechanism (SCRAM), including PgBouncer administrators and backend superusers. By sending a second connection startup message targeted at a non-existent database during an active SCRAM exchange, the target identity is switched while authentication is verified against the initial user credentials. This issue enables an authenticated attacker to achieve privilege escalation and obtain unauthorized administrative access across the database environment.

8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-841 - Improper Enforcement of Behavioral Workflow
Affected products
Fixed 4 products, the same list as for CVE-2026-107348
Threats
Impact Important
References
To clipboard 

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      "cwe": {
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        "name": "Integer Overflow or Wraparound"
      },
      "discovery_date": "2026-10-14T17:54:19.360346+00:00",
      "ids": [
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      "notes": [
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          "category": "description",
          "text": "A flaw was found in PgBouncer. An integer overflow in the message buffer growth logic allows a remote attacker to cause a Denial of Service (DoS) when a large maximum packet size is configured. By sending a specially crafted packet header declaring an excessively large length, an attacker can trigger an infinite loop in the buffer calculation. Because PgBouncer handles connections in a single process, this loop consumes a full CPU core and halts all pooled connections until the process is restarted.",
          "title": "Vulnerability description"
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          "text": "pgbouncer: pgbouncer: Denial of Service via integer overflow in message buffer growth",
          "title": "Vulnerability summary"
        },
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          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
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        ]
      },
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          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2552741"
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        },
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          "summary": "https://www.pgbouncer.org/changelog.html",
          "url": "https://www.pgbouncer.org/changelog.html"
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          "category": "vendor_fix",
          "date": "2026-10-16T20:27:54+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@aarch64",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@s390x",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@src",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@x86_64"
          ],
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          },
          "url": "https://access.redhat.com/errata/RHSA-2026:83843"
        },
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          "category": "workaround",
          "details": "Ensure that `max_packet_size` is not configured above 2147483647 in the PgBouncer configuration file.\n\n1. Edit `/etc/pgbouncer/pgbouncer.ini` and set `max_packet_size` to a safe value (or remove the directive to use standard defaults):\n\n```ini\n[pgbouncer]\nmax_packet_size = 2147483647\n```\n\n2. Reload the PgBouncer service to apply changes:\n\n```sh\nsystemctl reload pgbouncer\n```\n\nWarning: Reloading or restarting the service can disrupt ongoing administrative tasks or transient connections. Always schedule configuration reloads during standard maintenance windows.\n\n3. Restrict network access:\nApply firewall rules to ensure that the PgBouncer listening port (default 6432) is accessible only by trusted application hosts and not exposed to untrusted networks.\n\nCaveats: Setting `max_packet_size` to a lower threshold will reject legitimate queries or results exceeding that specified size.",
          "product_ids": [
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@aarch64",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@s390x",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@src",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
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            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@s390x",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@src",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@x86_64"
          ]
        }
      ],
      "threats": [
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          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "pgbouncer: pgbouncer: Denial of Service via integer overflow in message buffer growth"
    },
    {
      "cve": "CVE-2026-107349",
      "cwe": {
        "id": "CWE-835",
        "name": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)"
      },
      "discovery_date": "2026-10-14T17:51:59.764551+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2552735"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in PgBouncer. An unauthenticated remote attacker can cause a Denial of Service (DoS) by sending a startup message that contains an empty parameter name in its options. This causes PgBouncer to enter an infinite loop during startup parameter processing, consuming high CPU resources and rendering the service unresponsive to all clients until restarted.",
          "title": "Vulnerability description"
        },
        {
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          "text": "pgbouncer: pgbouncer: Denial of Service via empty parameter name in startup options",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
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          "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@s390x",
          "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@src",
          "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@x86_64"
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          "url": "https://access.redhat.com/security/cve/CVE-2026-107349"
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          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2552735"
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          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-107349",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-107349"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-107349",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-107349"
        },
        {
          "category": "external",
          "summary": "https://www.pgbouncer.org/changelog.html",
          "url": "https://www.pgbouncer.org/changelog.html"
        }
      ],
      "release_date": "2026-10-14T17:34:33.785000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-16T20:27:54+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@aarch64",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@s390x",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@src",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:83843"
        },
        {
          "category": "workaround",
          "details": "Restrict network access to the PgBouncer service so that only trusted application hosts and administrative clients can connect. This can be accomplished by configuring firewall filtering using firewalld or by binding PgBouncer only to internal, isolated interfaces.\n\nFor example, to restrict access to PgBouncer (default port 6432/TCP) to a trusted subnet (such as 192.168.1.0/24):\n\n1. Add a rich rule allowing only the trusted source subnet:\n# firewall-cmd --permanent --add-rich-rule=\u0027rule family=\"ipv4\" source address=\"192.168.1.0/24\" port port=\"6432\" protocol=\"tcp\" accept\u0027\n\n2. Ensure the port is not exposed in public zones:\n# firewall-cmd --permanent --remove-port=6432/tcp\n\n3. Reload firewalld to apply changes:\n# firewall-cmd --reload\n\nCaveats: Network-level restrictions reduce exposure to untrusted external clients but do not mitigate risks originating from compromised or untrusted hosts within the allowed network. Modifying firewall rules or listener configurations can momentarily disrupt active client sessions and connection pooling.",
          "product_ids": [
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@aarch64",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@s390x",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@src",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@aarch64",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@s390x",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@src",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "pgbouncer: pgbouncer: Denial of Service via empty parameter name in startup options"
    },
    {
      "cve": "CVE-2026-107350",
      "cwe": {
        "id": "CWE-841",
        "name": "Improper Enforcement of Behavioral Workflow"
      },
      "discovery_date": "2026-10-14T17:51:41.881021+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2552733"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in PgBouncer. An improper authentication vulnerability allows a remote attacker possessing valid credentials for any listed user to impersonate any other user configured with Salted Challenge Response Authentication Mechanism (SCRAM), including PgBouncer administrators and backend superusers. By sending a second connection startup message targeted at a non-existent database during an active SCRAM exchange, the target identity is switched while authentication is verified against the initial user credentials. This issue enables an authenticated attacker to achieve privilege escalation and obtain unauthorized administrative access across the database environment.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "pgbouncer: pgbouncer: Privilege escalation via secondary startup message during SCRAM authentication",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@aarch64",
          "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@s390x",
          "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@src",
          "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-107350"
        },
        {
          "category": "external",
          "summary": "RHBZ#2552733",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2552733"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-107350",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-107350"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-107350",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-107350"
        },
        {
          "category": "external",
          "summary": "https://www.pgbouncer.org/changelog.html",
          "url": "https://www.pgbouncer.org/changelog.html"
        }
      ],
      "release_date": "2026-10-14T17:34:39.009000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-16T20:27:54+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@aarch64",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@s390x",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@src",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:83843"
        },
        {
          "category": "workaround",
          "details": "Limit network access to the PgBouncer daemon so that only trusted application hosts can establish connections.\n\n1. Using firewalld, restrict traffic on the PgBouncer port (default 6432/tcp) to specific authorized client IP addresses:\n\n# firewall-cmd --permanent --zone=trusted --add-source=\u003cTRUSTED_CLIENT_IP\u003e\n# firewall-cmd --permanent --zone=trusted --add-port=6432/tcp\n# firewall-cmd --permanent --remove-port=6432/tcp --zone=public\n# firewall-cmd --reload\n\nAlternatively, if clients reside on the same host, bind PgBouncer exclusively to the loopback interface by configuring `listen_addr = 127.0.0.1` in `/etc/pgbouncer/pgbouncer.ini` and applying changes:\n\n# systemctl reload pgbouncer\n\nCaveats: Restricting network reachability prevents untrusted network hosts from connecting, but it does not protect against malicious or compromised clients residing within the permitted network range. Modifying firewall rules or reloading the PgBouncer service may briefly disrupt active client connections.",
          "product_ids": [
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@aarch64",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@s390x",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@src",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@aarch64",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@s390x",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@src",
            "Red Hat Hardened Images:pgbouncer-0:1.26.1-1.hum1@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "pgbouncer: pgbouncer: Privilege escalation via secondary startup message during SCRAM authentication"
    }
  ]
}



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