CVE-2025-59089

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While receiving the KDC's response, kdcproxy copies the entire buffered stream into a new\nbuffer on each recv() call, even when the transfer is incomplete, causing excessive memory allocation and CPU usage. Additionally, kdcproxy accepts incoming response chunks as long as the received data length is not exactly equal to the length indicated in the response\nheader, even when individual chunks or the total buffer exceed the maximum length of a Kerberos message. This allows an attacker to send unbounded data until the connection timeout is reached (approximately 12 seconds), exhausting server memory or CPU resources. Multiple concurrent requests can cause accept queue overflow, denying service to legitimate clients."}], "affected": [{"vendor": "latchset", "product": "kdcproxy", "versions": [{"status": "affected", "version": "0", "lessThan": "1.1.0", "versionType": "semver"}], "packageName": "kdcproxy", "collectionURL": "https://github.com/latchset/kdcproxy", "defaultStatus": "unaffected"}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "python-kdcproxy", "defaultStatus": "affected", "versions": [{"version": "0:1.0.0-19.el10_1", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": ["cpe:/o:redhat:enterprise_linux:10.1"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10.0 Extended Update Support", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "python-kdcproxy", "defaultStatus": "affected", "versions": 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Multiple concurrent requests can cause accept queue overflow, denying service to legitimate clients."}], "id": "CVE-2025-59089", "lastModified": "2026-06-30T05:17:25.493", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-59089", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-11-12T20:47:44.917442Z", "version": "2.0.3"}}]}, "published": "2025-11-12T17:15:38.360", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:21138"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:21139"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:21140"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:21141"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:21142"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:21448"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:21748"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:21806"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:21818"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:21819"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:21820"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:21821"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:22982"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/security/cve/CVE-2025-59089"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2393958"}, {"source": "secalert@redhat.com", "url": "https://github.com/latchset/kdcproxy/commit/c7675365aa20be11f03247966336c7613cac84e1"}, {"source": "secalert@redhat.com", "url": "https://github.com/latchset/kdcproxy/pull/68"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://github.com/latchset/kdcproxy/commit/c7675365aa20be11f03247966336c7613cac84e1"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Arad Inbar for reporting this issue.", "affected_release": [{"advisory": "RHSA-2025:21142", "cpe": "cpe:/o:redhat:enterprise_linux:10.1", "package": "python-kdcproxy-0:1.0.0-19.el10_1", "product_name": "Red Hat Enterprise Linux 10", "release_date": "2025-11-12T00:00:00Z"}, {"advisory": "RHSA-2025:21141", "cpe": "cpe:/o:redhat:enterprise_linux_eus:10.0", "package": "python-kdcproxy-0:1.0.0-19.el10_0", "product_name": "Red Hat Enterprise Linux 10.0 Extended Update Support", "release_date": "2025-11-12T00:00:00Z"}, {"advisory": "RHSA-2025:21140", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "idm:client-8100020251103113748.143e9e98", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2025-11-12T00:00:00Z"}, {"advisory": "RHSA-2025:21140", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "idm:DL1-8100020251028161822.823393f5", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2025-11-12T00:00:00Z"}, {"advisory": "RHSA-2025:21139", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "python-kdcproxy-0:1.0.0-9.el9_7", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-11-12T00:00:00Z"}, {"advisory": "RHSA-2025:21138", "cpe": "cpe:/a:redhat:rhel_eus:9.6", "package": "python-kdcproxy-0:1.0.0-9.el9_6", "product_name": "Red Hat Enterprise Linux 9.6 Extended Update Support", "release_date": "2025-11-12T00:00:00Z"}], "bugzilla": {"description": "python-kdcproxy: Remote DoS via unbounded TCP upstream buffering", "id": "2393958", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2393958"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-770", "details": ["If an attacker causes kdcproxy to connect to an attacker-controlled KDC server (e.g. through server-side request forgery), they can exploit the fact that kdcproxy does not enforce bounds on TCP response length to conduct a denial-of-service attack. While receiving the KDC's response, kdcproxy copies the entire buffered stream into a new\nbuffer on each recv() call, even when the transfer is incomplete, causing excessive memory allocation and CPU usage. Additionally, kdcproxy accepts incoming response chunks as long as the received data length is not exactly equal to the length indicated in the response\nheader, even when individual chunks or the total buffer exceed the maximum length of a Kerberos message. This allows an attacker to send unbounded data until the connection timeout is reached (approximately 12 seconds), exhausting server memory or CPU resources. Multiple concurrent requests can cause accept queue overflow, denying service to legitimate clients."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2025-59089", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "python-kdcproxy", "product_name": "Red Hat Enterprise Linux 7"}], "public_date": "2025-11-12T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-59089\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-59089\nhttps://github.com/latchset/kdcproxy/pull/68"], "threat_severity": "Moderate"}

{"analysis": {"en": {"generated_at": "2026-04-20T15:28:32.205463+00:00", "value": {"mitigation_remediation": ["Apply the latest Red\u00a0Hat update that replaces the vulnerable kdcproxy package (RHSA\u20112025:21138 through RHSA\u20112025:21821).", "Immediately restrict kdcproxy\u2019s outbound connections to only authorized KDC servers using firewall rules or ACLs.", "Monitor system memory and CPU usage for abnormal spikes and, if possible, disable kdcproxy or switch to the native Kerberos implementation until the patch is deployed."], "summary": {"action": "Immediate Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "The flaw impacts Red\u00a0Hat Enterprise\u00a0Linux 10, RHEL\u00a07 ELS, RHEL\u00a08, and RHEL\u00a09 across all standard, extended update, and advanced mission\u2011critical update streams, as well as the latchset:kdcproxy component. The recent errata (RHSA\u20112025:21138 through RHSA\u20112025:21821) replace kdcproxy with a fixed package that enforces TCP response size limits and rejects oversized chunks. Any system running a kdcproxy version prior to these updates is susceptible.", "description_and_impact": "The vulnerability in Python\u2011kdcproxy permits a remote denial\u2011of\u2011service attack by exploiting its failure to bound the size of TCP upstream responses. When an attacker forces kdcproxy to connect to a server under their control, each recv() call copies the entire streamed data into a fresh buffer, even if the transfer is incomplete. Because no length limits are enforced, the component will allocate memory unboundedly and use excessive CPU, triggering exhaustion of server resources. kdcproxy also accepts incoming data chunks as long as their declared length does not exactly match the response header, allowing an attacker to send arbitrarily large data until the 12\u2011second timeout, further depleting CPU and memory. This classic uncontrolled memory allocation flaw in a security\u2011critical component is identified as CWE\u2011770.", "risk_and_exploitability": "The CVSS score of 5.9 indicates moderate severity, while the EPSS score of <1% suggests an extremely low likelihood of exploitation in the wild. The vulnerability is not listed in the CISA KEV catalog. The most realistic attack path requires an attacker to cause kdcproxy to connect to an attacker\u2011controlled KDC, which could be achieved via server\u2011side request forgery or mis\u2011configured trusted host lists. Even though the exploitation probability is low, the impact can bring all Kerberos clients on the affected system to a halt if the denial\u2011of\u2011service succeeds."}}}}, "created": "2026-04-20T15:30:06.174176+00:00", "updated": "2026-04-20T15:30:06.174193+00:00", "vendors": []}