CVE-2026-4359

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{"bugzilla": {"description": "mongo-c-driver: mongo-c-driver: Denial of Service via malformed HTTP response", "id": "2448447", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2448447"}, "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": "draft"}, "cwe": "CWE-170", "details": ["A flaw was found in mongo-c-driver. A compromised third-party cloud server or a man-in-the-middle (MITM) attacker could send a malformed HTTP response. This could cause applications using the MongoDB C driver to crash, leading to a Denial of Service."], "name": "CVE-2026-4359", "public_date": "2026-03-17T19:42:03Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-4359\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-4359\nhttps://jira.mongodb.org/browse/CDRIVER-6251"], "statement": "This LOW impact vulnerability in the MongoDB C driver allows denial of service via malformed HTTP responses. Exploitation requires high complexity\u2014either a compromised cloud server or active MITM position. Impact is limited to availability. Applications are only vulnerable when connecting to untrusted MongoDB instances or over untrusted networks.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,2.2.3)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "MongoDB C Driver", "source": "cna", "vendor": "MongoDB Inc"}, "product": "c_driver", "vendor": "mongodb"}], "analysis": {"en": {"generated_at": "2026-04-02T13:27:54.427975+00:00", "value": {"mitigation_remediation": ["Upgrade to the latest MongoDB C driver version that includes the fix.", "If upgrade is not immediately possible, enable any available runtime memory\u2011check or security flags to mitigate accidental over\u2011read.", "Validate incoming HTTP responses or use a proxy to sanitize responses before they reach the driver.", "Monitor vendor announcements and apply any hotfixes as soon as they become available."], "summary": {"action": "Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "Affected systems include MongoDB Inc's MongoDB C driver. No specific version range is listed in the advisory, so any instance of the driver that contains the _mongoc_http_send implementation is potentially vulnerable until a patch is applied.", "description_and_impact": "The vulnerability involves a heap\u2011buffer\u2011over\u2011read in the _mongoc_http_send function of the MongoDB C driver. A non\u2011null\u2011terminated buffer is passed to strstr, causing the function to read past the allocated memory. This memory access error results in an application crash. The primary impact is a denial of service, as the targeted process terminates unexpectedly. The weakness corresponds to out\u2011of\u2011bounds array access and improper string termination.", "risk_and_exploitability": "The CVSS score is 2, indicating low severity, and the EPSS score is below 1%, suggesting that exploitation is unlikely at present. It is not listed in the CISA KEV catalog. The likely attack vector is remote, where a compromised third\u2011party cloud server or a man\u2011in\u2011the\u2011middle attacker can send a crafted HTTP response to trigger the crash. Once executed, the crash leads to a denial of service without providing confidentiality or integrity impact."}}}}, "created": "2026-03-18T10:42:50.398427+00:00", "updated": "2026-04-02T20:23:35.743603+00:00", "vendors": ["mongodb", "mongodb$PRODUCT$c_driver"]}