CVE-2026-121505

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{"bugzilla": {"description": "ntpsec: ntpsec: Information disclosure via malformed NTS-KE response record", "id": "2565815", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2565815"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-125", "details": ["An out-of-bounds read in the NTS-KE client response parser (nts_client_process_response_core) in NTPsec before 1.2.4 allows a malicious NTS-KE server to read the client's stack memory, including pointers that defeat ASLR, which the client then sends in cleartext as NTS cookies, via an NTS-KE record whose declared length exceeds the data received.", "A flaw was found in NTPsec. A malicious Network Time Security Key Exchange (NTS-KE) server can cause information disclosure by sending a response record with a declared length exceeding the data received. This triggers an out-of-bounds read in the client response parser, allowing the server to retrieve sensitive stack memory, such as internal pointers that weaken Address Space Layout Randomization (ASLR), which the client sends back in cleartext."], "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-2026-121505", "public_date": "2026-11-03T14:17:09Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-121505\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-121505\nhttps://gitlab.com/NTPsec/ntpsec/-/commit/caf0eb5df3c6ddbfc2941389bff0f9146835c021\nhttps://gitlab.com/NTPsec/ntpsec/-/work_items/836\nhttps://gitlab.com/NTPsec/ntpsec/-/work_items/902"], "statement": "This vulnerability is rated with a Low severity because exploitation requires an attacker to operate or compromise a designated upstream NTS-KE time server, limiting the attack surface to scenarios where a client connects to an untrusted endpoint. Red Hat Enterprise Linux does not include NTPsec in core repositories, relying on chrony as the default time synchronization mechanism. On systems where NTPsec is obtained from community channels, the impact is confined to partial client memory disclosure with no capability for remote code execution or disruption of system availability.", "threat_severity": "Low"}

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