{"id":"CVE-2026-111458","revision":null,"records":[{"revision":"535ea52dca3540eda24f6a12c5394b1a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-111458","aliases":[],"title":"ssldump Heap Buffer Overflow in FAN/1 X.509 Fingerprint Formatting","description":"The fanx_fingerprint function in ssl/sslxprint.c of ssldump allocates a heap buffer for formatting FAN/1 X.509 certificate fingerprints. The allocation size is computed as strlen(b64) + strlen(hex) + 31, but the format string \"fan1:x509:server:passive:%s:sha256:%s\" contains 33 fixed characters in addition to the two variable-length fields and a null terminator, requiring strlen(b64) + strlen(hex) + 34 bytes. This miscalculation results in a 3-byte heap-based buffer overflow on every invocation of the function with valid inputs. The overflow occurs because sprintf writes the full formatted string into the undersized heap buffer without bounds checking. An attacker who can supply a crafted pcap file containing a TLS X.509 certificate to a user running ssldump with FAN/1 fingerprinting enabled (for example with the -j -N options) can trigger the overflow. The resulting heap corruption may lead to denial of service through a crash or, in a worst-case scenario, arbitrary code execution in the context of the user running ssldump. The vulnerability is deterministic and requires no special privileges beyond the ability to provide input to the tool.","state":0,"publishedAt":"2026-10-16T05:24:43.178+00:00","modifiedAt":"2026-10-16T12:30:53.251+00:00","affected":[{"ecosystem":"Vendor product","name":"ssldump","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"cpes\": [\n                        \"cpe:2.3:a:adulau:ssldump:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"ssl/sslxprint.c (fanx_fingerprint)\"\n                    ],\n                    \"product\": \"ssldump\",\n                    \"programFiles\": [\n                        \"ssl/sslxprint.c\"\n                    ],\n                    \"repo\": \"https://github.com/adulau/ssldump\",\n                    \"vendor\": \"adulau\",\n                    \"versions\": [\n                        {\n                            \"lessThanOrEqual\": \"1.9.0\",\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","score":6.8,"severity":"MEDIUM"}],"references":["https://github.com/adulau/ssldump/commit/8ad55683cc0186600c085d33be5a5b627db78467"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-111458","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-111458","identifiers":["CVE-2026-111458"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-09T11:02:29.3269367+00:00","complete":true,"records":1769,"lastAttemptAt":"2026-11-09T11:02:29.3269367+00:00","lastSuccessAt":"2026-11-09T11:02:35.5033455+00:00","error":null,"lastVerifiedAt":"2026-11-09T11:02:35.5033494+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-24e6fde7b744113daefb8f6135035fb8a5c69c9617c9c0d40574a0376532ffd3-8a359c2c34b32e9d5ae6bfb0dfbe77525737d387cb73ffa1dc9d8560ac4a618d","complete":true,"records":421363,"lastAttemptAt":"2026-11-09T11:02:25.6637161+00:00","lastSuccessAt":"2026-11-09T11:02:25.604523+00:00","error":null,"lastVerifiedAt":"2026-11-09T11:02:25.6637161+00:00","snapshotPublishedAt":"2026-11-09T10:27:35+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-776f160a8a4245ff82395b78f580cf00","complete":true,"records":13655,"lastAttemptAt":"2026-11-09T11:14:40.9797117+00:00","lastSuccessAt":"2026-11-09T11:14:40.976+00:00","error":null,"lastVerifiedAt":"2026-11-09T11:14:40.976+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13707,"expectedIdentifiers":13707,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-09T11:02:29.3269367+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-09T11:02:29.3269367+00:00","lastSuccessAt":"2026-11-09T11:02:35.5044085+00:00","error":null,"lastVerifiedAt":"2026-11-09T11:02:35.5044088+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-4dc74a26d06148ffa8eb6751d602315d","complete":true,"records":13667,"lastAttemptAt":"2026-11-09T11:02:37.2248176+00:00","lastSuccessAt":"2026-11-09T10:04:35.272+00:00","error":null,"lastVerifiedAt":"2026-11-09T10:04:35.272+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13707,"expectedIdentifiers":13707,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-980593e6977a6d1b4fb1eed5a1ffe88a468736f89f0a06f710924ad59132c023","complete":true,"records":9914,"lastAttemptAt":"2026-11-09T11:02:28.1148102+00:00","lastSuccessAt":"2026-11-08T11:07:07.068788+00:00","error":null,"lastVerifiedAt":"2026-11-09T11:02:28.1148102+00:00","snapshotPublishedAt":"2026-11-08T11:02:46+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-fde804134ecdda0ddd5ff5c26ee1fff5a6fa659311f7ef2e51c6ad54964db0e2","complete":true,"records":1971,"lastAttemptAt":"2026-11-09T11:02:27.3222548+00:00","lastSuccessAt":"2026-11-06T19:03:17.0399903+00:00","error":null,"lastVerifiedAt":"2026-11-09T11:02:27.3222548+00:00","snapshotPublishedAt":"2026-11-06T18:17:57+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-747b24005f13ffe3f133ae77dfb12ae3145f2c7aed5cfebb91eb943ceb4daeb6","complete":true,"records":3060,"lastAttemptAt":"2026-11-09T11:02:28.9741191+00:00","lastSuccessAt":"2026-11-09T10:04:33.8957851+00:00","error":null,"lastVerifiedAt":"2026-11-09T11:02:28.9741191+00:00","snapshotPublishedAt":"2026-11-09T10:03:05+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-e6e6ac3eaece246ff08884368fe1dc99d4d393571e77c126c8f4d38d66697688","complete":true,"records":231297,"lastAttemptAt":"2026-11-09T11:02:27.67422+00:00","lastSuccessAt":"2026-11-09T10:04:27.0059369+00:00","error":null,"lastVerifiedAt":"2026-11-09T11:02:27.67422+00:00","snapshotPublishedAt":"2026-11-09T09:33:10+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}