{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-129122", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-11-13T16:01:00.441Z", "datePublished": "2026-11-13T16:23:44.625Z", "dateUpdated": "2026-11-13T16:23:44.625Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-11-13T16:23:44.625Z"}, "datePublic": "2026-10-31T00:00:00.000Z", "title": "C-Kermit 6.0.192 before 11.1.515 Buffer Overflow via Telnet NEW-ENVIRON Negotiation", "descriptions": [{"lang": "en", "value": "C-Kermit 6.0.192 before 11.1.515 contains a buffer overflow vulnerability in tn_snenv() in ckctel.c that allows malicious Telnet servers to corrupt client memory via crafted NEW-ENVIRON SEND subnegotiation. Malicious or machine-in-the-middle servers can send oversized variable names before authentication, overflowing a 16-byte stack buffer and a miscomputed heap buffer to corrupt stack and heap memory."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Out-of-bounds Write", "cweId": "CWE-787", "type": "CWE"}]}], "affected": [{"vendor": "OpenKermit", "product": "C-Kermit", "defaultStatus": "unaffected", "versions": [{"version": "6.0.192", "status": "affected", "lessThan": "11.1.515", "versionType": "semver"}], "packageURL": "pkg:github/OpenKermit/ckermit"}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N", "attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 7.7, "baseSeverity": "HIGH"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH"}}], "references": [{"url": "https://github.com/OpenKermit/ckermit/security/advisories/GHSA-c5px-7h4c-gj8p", "tags": ["vendor-advisory"], "name": "GitHub Security Advisory (GHSA-c5px-7h4c-gj8p)"}, {"url": "https://github.com/OpenKermit/ckermit/commit/39ab009a365b97632e9975e1266fa618c4bdc59f", "tags": ["patch"]}, {"url": "https://github.com/OpenKermit/ckermit/commit/42cf6decb926f56d606a76262791aaf071955d25", "tags": ["patch"]}, {"url": "https://github.com/OpenKermit/ckermit/releases/tag/v11.1.515", "tags": ["release-notes"], "name": "C-Kermit v11.1.515 Release Notes"}, {"url": "https://github.com/OpenKermit/ckermit/blob/v11.0.514/ckctel.c#L5622", "tags": ["technical-description"]}, {"name": "VulnCheck Advisory: C-Kermit 6.0.192 before 11.1.515 Buffer Overflow via Telnet NEW-ENVIRON Negotiation", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/c-kermit-6.0.192-before-11.1.515-buffer-overflow-via-telnet-new-environ-negotiation"}], "credits": [{"lang": "en", "value": "John Goerzen", "type": "finder"}, {"lang": "en", "value": "John Goerzen", "type": "remediation developer"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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