{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-129483", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-11-15T13:41:10.001Z", "datePublished": "2026-11-15T13:47:23.552Z", "dateUpdated": "2026-11-15T13:47:23.552Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-11-15T13:47:23.552Z" }, "datePublic": "2026-07-31T00:00:00.000Z", "title": "Cyrus SASL through 2.1.28 SRP Authentication Bypass via plugins/srp.c", "descriptions": [ { "lang": "en", "value": "Cyrus SASL through 2.1.28 contains an authentication bypass vulnerability in the SRP server mechanism because srp_server_mech_step2 does not reject client public values A that are multiples of N. Unauthenticated network clients can send A equal to N to force a zero shared secret, authenticating as any existing user without the password and learning session keys." } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "description": "Improper Authentication", "cweId": "CWE-287", "type": "CWE" } ] } ], "affected": [ { "vendor": "cyrusimap", "product": "cyrus-sasl", "defaultStatus": "unaffected", "versions": [ { "version": "0", "lessThanOrEqual": "2.1.28", "status": "affected", "versionType": "semver" } ], "packageURL": "pkg:github/cyrusimap/cyrus-sasl", "repo": "https://github.com/cyrusimap/cyrus-sasl" } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:a:cyrusimap:cyrus-sasl:*:*:*:*:*:*:*:*", "versionEndIncluding": "2.1.28" } ] } ] } ], "metrics": [ { "format": "CVSS", "cvssV4_0": { "version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 9.3, "baseSeverity": "CRITICAL" } }, { "format": "CVSS", "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE", "baseScore": 9.1, "baseSeverity": "CRITICAL" } } ], "references": [ { "url": "https://github.com/cyrusimap/cyrus-sasl/issues/896", "tags": [ "issue-tracking" ] }, { "url": "https://seclists.org/oss-sec/2026/q4/122", "tags": [ "mailing-list" ] }, { "url": "https://gist.github.com/afldl/18d15d3f5a1df99411e35000c7de80db", "tags": [ "exploit" ] }, { "url": "https://github.com/cyrusimap/cyrus-sasl/commit/fb3724f43dc50247ff2bf02135457d6d77031654", "tags": [ "patch" ] }, { "url": "https://github.com/cyrusimap/cyrus-sasl/blob/cyrus-sasl-2.1.28/plugins/srp.c#L2046-L2050", "tags": [ "technical-description" ] }, { "name": "VulnCheck Advisory: Cyrus SASL through 2.1.28 SRP Authentication Bypass via plugins/srp.c", "tags": [ "third-party-advisory" ], "url": "https://www.vulncheck.com/advisories/cyrus-sasl-through-2.1.28-srp-authentication-bypass-via-plugins-srp-c" } ], "credits": [ { "lang": "en", "value": "afldl", "type": "finder" } ], "x_generator": { "engine": "vulncheck-endgame" } } } }