{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-33306", "tracking": { "current_release_date": "2026-03-30T14:26:02.677089Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-33306", "initial_release_date": "2026-03-20T18:16:23.395865Z", "revision_history": [ { "date": "2026-03-20T18:16:23.395865Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-03-20T18:16:24.257988Z", "number": "2", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (19).| Product Identifiers created (18).| References created (1).| CWES updated (1)." }, { "date": "2026-03-20T18:16:26.191516Z", "number": "3", "summary": "NCSC Score created." }, { "date": "2026-03-20T18:16:28.448788Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-23T00:44:45.607865Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Products created (2)." }, { "date": "2026-03-23T00:44:50.437351Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-03-24T20:43:21.228053Z", "number": "7", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-03-24T20:43:24.077620Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-03-24T20:44:03.341726Z", "number": "9", "summary": "Description created for source." }, { "date": "2026-03-24T20:45:43.469761Z", "number": "10", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (3).| CWES updated (1)." }, { "date": "2026-03-24T20:45:48.510066Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-03-24T20:51:25.584193Z", "number": "12", "summary": "Unknown change." }, { "date": "2026-03-24T20:54:41.638750Z", "number": "13", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| Product Identifiers created (1).| Products created (1).| References created (5).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-03-24T20:54:46.256820Z", "number": "14", "summary": "NCSC Score updated." }, { "date": "2026-03-24T21:37:38.551127Z", "number": "15", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-25T21:50:28.421770Z", "number": "16", "summary": "References created (4)." }, { "date": "2026-03-26T00:40:59.221335Z", "number": "17", "summary": "References created (4)." }, { "date": "2026-03-29T03:16:11.636575Z", "number": "18", "summary": "References removed (4)." }, { "date": "2026-03-29T16:14:18.186716Z", "number": "19", "summary": "References created (4)." }, { "date": "2026-03-30T14:25:10.175303Z", "number": "20", "summary": "CVSS created.| Products created (1).| Product Identifiers created (1)." }, { "date": "2026-03-30T14:25:12.972005Z", "number": "21", "summary": "NCSC Score updated." } ], "status": "interim", "version": "21" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/6", "product": { "name": "vers:rpm/6", "product_id": "CSAFPID-1439313", "product_identification_helper": { "cpe": "cpe:/a:redhat:satellite:6" } } } ], "category": "product_name", "name": "Red Hat Satellite 6" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5902840" } } ], "category": "product_name", "name": "rubygem-bcrypt" } ], "category": "product_family", "name": "Red Hat Satellite 6" } ], "category": "vendor", "name": "Red Hat" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/3.1.10", "product": { "name": "vers:unknown/3.1.10", "product_id": "CSAFPID-5873827", "product_identification_helper": { "purl": "pkg:gem/bcrypt@3.1.10" } } }, { "category": "product_version_range", "name": "vers:unknown/3.1.11", "product": { "name": "vers:unknown/3.1.11", "product_id": "CSAFPID-5873828", "product_identification_helper": { "purl": "pkg:gem/bcrypt@3.1.11" } } }, { "category": "product_version_range", "name": "vers:unknown/3.1.12", "product": { "name": "vers:unknown/3.1.12", "product_id": "CSAFPID-5873829", "product_identification_helper": { "purl": "pkg:gem/bcrypt@3.1.12" } } }, { "category": "product_version_range", "name": "vers:unknown/3.1.12.rc1", "product": { "name": "vers:unknown/3.1.12.rc1", "product_id": "CSAFPID-5873830", "product_identification_helper": { "purl": "pkg:gem/bcrypt@3.1.12.rc1" } } }, { "category": "product_version_range", "name": "vers:unknown/3.1.13", "product": { "name": "vers:unknown/3.1.13", "product_id": "CSAFPID-5873831", "product_identification_helper": { "purl": "pkg:gem/bcrypt@3.1.13" } } }, { "category": "product_version_range", "name": "vers:unknown/3.1.14", "product": { "name": "vers:unknown/3.1.14", "product_id": "CSAFPID-5873832", "product_identification_helper": { "purl": "pkg:gem/bcrypt@3.1.14" } } }, { "category": "product_version_range", "name": "vers:unknown/3.1.15", "product": { "name": "vers:unknown/3.1.15", "product_id": "CSAFPID-5873833", "product_identification_helper": { "purl": "pkg:gem/bcrypt@3.1.15" } } }, { "category": "product_version_range", "name": "vers:unknown/3.1.16", "product": { "name": "vers:unknown/3.1.16", "product_id": "CSAFPID-5873834", "product_identification_helper": { "purl": "pkg:gem/bcrypt@3.1.16" } } }, { "category": "product_version_range", "name": "vers:unknown/3.1.17", "product": { "name": "vers:unknown/3.1.17", "product_id": "CSAFPID-5873835", "product_identification_helper": { "purl": "pkg:gem/bcrypt@3.1.17" } } }, { "category": "product_version_range", "name": "vers:unknown/3.1.18", "product": { "name": "vers:unknown/3.1.18", "product_id": "CSAFPID-5873836", "product_identification_helper": { "purl": "pkg:gem/bcrypt@3.1.18" } } }, { "category": "product_version_range", "name": "vers:unknown/3.1.19", "product": { "name": "vers:unknown/3.1.19", "product_id": "CSAFPID-5873837", "product_identification_helper": { "purl": "pkg:gem/bcrypt@3.1.19" } } }, { "category": "product_version_range", "name": "vers:unknown/3.1.20", "product": { "name": "vers:unknown/3.1.20", "product_id": "CSAFPID-5873838", "product_identification_helper": { "purl": "pkg:gem/bcrypt@3.1.20" } } }, { "category": "product_version_range", "name": "vers:unknown/3.1.21", "product": { "name": "vers:unknown/3.1.21", "product_id": "CSAFPID-5873839", "product_identification_helper": { "purl": "pkg:gem/bcrypt@3.1.21" } } }, { "category": "product_version_range", "name": "vers:unknown/3.1.3", "product": { "name": "vers:unknown/3.1.3", "product_id": "CSAFPID-5873840", "product_identification_helper": { "purl": "pkg:gem/bcrypt@3.1.3" } } }, { "category": "product_version_range", "name": "vers:unknown/3.1.6", "product": { "name": "vers:unknown/3.1.6", "product_id": "CSAFPID-5873841", "product_identification_helper": { "purl": "pkg:gem/bcrypt@3.1.6" } } }, { "category": "product_version_range", "name": "vers:unknown/3.1.7", "product": { "name": "vers:unknown/3.1.7", "product_id": "CSAFPID-5873842", "product_identification_helper": { "purl": "pkg:gem/bcrypt@3.1.7" } } }, { "category": "product_version_range", "name": "vers:unknown/3.1.8", "product": { "name": "vers:unknown/3.1.8", "product_id": "CSAFPID-5873843", "product_identification_helper": { "purl": "pkg:gem/bcrypt@3.1.8" } } }, { "category": "product_version_range", "name": "vers:unknown/3.1.9", "product": { "name": "vers:unknown/3.1.9", "product_id": "CSAFPID-5873844", "product_identification_helper": { "purl": "pkg:gem/bcrypt@3.1.9" } } }, { "category": "product_version_range", "name": "vers:unknown/>=0|<3.1.22", "product": { "name": "vers:unknown/>=0|<3.1.22", "product_id": "CSAFPID-5873845" } } ], "category": "product_name", "name": "bcrypt" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<3.1.22", "product": { "name": "vers:unknown/<3.1.22", "product_id": "CSAFPID-5902091" } } ], "category": "product_name", "name": "bcrypt-ruby" } ], "category": "vendor", "name": "bcrypt-ruby" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<3.1.22", "product": { "name": "vers:unknown/<3.1.22", "product_id": "CSAFPID-5965331", "product_identification_helper": { "cpe": "cpe:2.3:a:bcrypt-ruby_project:bcrypt-ruby:*:*:*:*:*:ruby:*:*" } } } ], "category": "product_name", "name": "bcrypt-ruby" } ], "category": "vendor", "name": "bcrypt-ruby_project" }, { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-5890281" } } ], "category": "product_name", "name": "ruby-bcrypt" } ], "category": "product_family", "name": "bookworm" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-5890282" } } ], "category": "product_name", "name": "ruby-bcrypt" } ], "category": "product_family", "name": "bullseye" } ], "category": "vendor", "name": "debian" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-33306", "cwe": { "id": "CWE-190", "name": "Integer Overflow or Wraparound" }, "notes": [ { "category": "description", "text": "### Impact\n\nAn integer overflow in the Java BCrypt implementation for JRuby can cause zero iterations in the strengthening loop. Impacted applications must be setting the cost to 31 to see this happen.\n\nThe JRuby implementation of bcrypt-ruby (`BCrypt.java`) computes the key-strengthening round count as a signed 32-bit integer. When `cost=31` (the maximum allowed by the gem), signed integer overflow causes the round count to become negative, and the strengthening loop executes **zero iterations**. This collapses bcrypt from 2^31 rounds of exponential key-strengthening to effectively constant-time computation — only the initial EksBlowfish key setup and final 64x encryption phase remain.\n\nThe resulting hash looks valid (`$2a$31$...`) and verifies correctly via `checkpw`, making the weakness invisible to the application. This issue is triggered only when cost=31 is used or when verifying a `$2a$31$` hash.\n\n### Patches\n\nThis problem has been fixed in version 3.1.22\n\n### Workarounds\n\nSet the cost to something less than 31.", "title": "github - https://api.github.com/advisories/GHSA-f27w-vcwj-c954" }, { "category": "description", "text": "### Impact\n\nAn integer overflow in the Java BCrypt implementation for JRuby can cause zero iterations in the strengthening loop. Impacted applications must be setting the cost to 31 to see this happen.\n\nThe JRuby implementation of bcrypt-ruby (`BCrypt.java`) computes the key-strengthening round count as a signed 32-bit integer. When `cost=31` (the maximum allowed by the gem), signed integer overflow causes the round count to become negative, and the strengthening loop executes **zero iterations**. This collapses bcrypt from 2^31 rounds of exponential key-strengthening to effectively constant-time computation — only the initial EksBlowfish key setup and final 64x encryption phase remain.\n\nThe resulting hash looks valid (`$2a$31$...`) and verifies correctly via `checkpw`, making the weakness invisible to the application. This issue is triggered only when cost=31 is used or when verifying a `$2a$31$` hash.\n\n### Patches\n\nThis problem has been fixed in version 3.1.22\n\n### Workarounds\n\nSet the cost to something less than 31.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/RubyGems%2FGHSA-f27w-vcwj-c954.json?alt=media" }, { "category": "description", "text": "bcrypt-ruby is a Ruby binding for the OpenBSD bcrypt() password hashing algorithm. Prior to version 3.1.22, an integer overflow in the Java BCrypt implementation for JRuby can cause zero iterations in the strengthening loop. Impacted applications must be setting the cost to 31 to see this happen. The JRuby implementation of bcrypt-ruby (`BCrypt.java`) computes the key-strengthening round count as a signed 32-bit integer. When `cost=31` (the maximum allowed by the gem), signed integer overflow causes the round count to become negative, and the strengthening loop executes **zero iterations**. This collapses bcrypt from 2^31 rounds of exponential key-strengthening to effectively constant-time computation — only the initial EksBlowfish key setup and final 64x encryption phase remain. The resulting hash looks valid (`$2a$31$...`) and verifies correctly via `checkpw`, making the weakness invisible to the application. This issue is triggered only when cost=31 is used or when verifying a `$2a$31$` hash. This problem has been fixed in version 3.1.22. As a workaround, set the cost to something less than 31.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33306" }, { "category": "description", "text": "bcrypt-ruby is a Ruby binding for the OpenBSD bcrypt() password hashing algorithm. Prior to version 3.1.22, an integer overflow in the Java BCrypt implementation for JRuby can cause zero iterations in the strengthening loop. Impacted applications must be setting the cost to 31 to see this happen. The JRuby implementation of bcrypt-ruby (`BCrypt.java`) computes the key-strengthening round count as a signed 32-bit integer. When `cost=31` (the maximum allowed by the gem), signed integer overflow causes the round count to become negative, and the strengthening loop executes **zero iterations**. This collapses bcrypt from 2^31 rounds of exponential key-strengthening to effectively constant-time computation — only the initial EksBlowfish key setup and final 64x encryption phase remain. The resulting hash looks valid (`$2a$31$...`) and verifies correctly via `checkpw`, making the weakness invisible to the application. This issue is triggered only when cost=31 is used or when verifying a `$2a$31$` hash. This problem has been fixed in version 3.1.22. As a workaround, set the cost to something less than 31.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-33306" }, { "category": "description", "text": "bcrypt-ruby is a Ruby binding for the OpenBSD bcrypt() password hashing algorithm. Prior to version 3.1.22, an integer overflow in the Java BCrypt implementation for JRuby can cause zero iterations in the strengthening loop. Impacted applications must be setting the cost to 31 to see this happen. The JRuby implementation of bcrypt-ruby (`BCrypt.java`) computes the key-strengthening round count as a signed 32-bit integer. When `cost=31` (the maximum allowed by the gem), signed integer overflow causes the round count to become negative, and the strengthening loop executes **zero iterations**. This collapses bcrypt from 2^31 rounds of exponential key-strengthening to effectively constant-time computation — only the initial EksBlowfish key setup and final 64x encryption phase remain. The resulting hash looks valid (`$2a$31$...`) and verifies correctly via `checkpw`, making the weakness invisible to the application. This issue is triggered only when cost=31 is used or when verifying a `$2a$31$` hash. This problem has been fixed in version 3.1.22. As a workaround, set the cost to something less than 31.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33306.json" }, { "category": "description", "text": "A flaw was found in bcrypt-ruby, a Ruby binding for the OpenBSD bcrypt() password hashing algorithm, specifically in its JRuby implementation. When the cost parameter is set to 31, an integer overflow occurs, causing the key-strengthening loop to execute zero iterations. This significantly weakens the generated password hashes, effectively reducing the computational effort required to crack them. An attacker could leverage this to more easily compromise user accounts protected by affected applications.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33306.json" }, { "category": "other", "text": "8e-05", "title": "EPSS" }, { "category": "other", "text": "CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U", "title": "CVSSV4" }, { "category": "other", "text": "4.5", "title": "CVSSV4 base score" }, { "category": "other", "text": "4.2", "title": "NCSC Score" }, { "category": "details", "text": "Severity: 2\n", "title": "Vendor assessment" } ], "product_status": { "known_affected": [ "CSAFPID-5873827", "CSAFPID-5873828", "CSAFPID-5873829", "CSAFPID-5873830", "CSAFPID-5873831", "CSAFPID-5873832", "CSAFPID-5873833", "CSAFPID-5873834", "CSAFPID-5873835", "CSAFPID-5873836", "CSAFPID-5873837", "CSAFPID-5873838", "CSAFPID-5873839", "CSAFPID-5873840", "CSAFPID-5873841", "CSAFPID-5873842", "CSAFPID-5873843", "CSAFPID-5873844", "CSAFPID-5873845", "CSAFPID-5890281", "CSAFPID-5890282", "CSAFPID-5902091", "CSAFPID-5965331" ], "known_not_affected": [ "CSAFPID-1439313", "CSAFPID-5902840" ] }, "references": [ { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-f27w-vcwj-c954" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/RubyGems%2FGHSA-f27w-vcwj-c954.json?alt=media" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-33306" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33306" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33306.json" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33306.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv; redhat", "url": "https://github.com/bcrypt-ruby/bcrypt-ruby/security/advisories/GHSA-f27w-vcwj-c954" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-f27w-vcwj-c954" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv; redhat", "url": "https://github.com/bcrypt-ruby/bcrypt-ruby/commit/831ce64cb0a9502130fa93a28bfd9527a5fa45c4" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv; redhat", "url": "https://github.com/bcrypt-ruby/bcrypt-ruby/releases/tag/v3.1.22" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-33306" }, { "category": "external", "summary": "Reference - github; osv; redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33306" }, { "category": "external", "summary": "Reference - github; osv", "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/bcrypt/CVE-2026-33306.yml" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 7.5, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-5873827", "CSAFPID-5873828", "CSAFPID-5873829", "CSAFPID-5873830", "CSAFPID-5873831", "CSAFPID-5873832", "CSAFPID-5873833", "CSAFPID-5873834", "CSAFPID-5873835", "CSAFPID-5873836", "CSAFPID-5873837", "CSAFPID-5873838", "CSAFPID-5873839", "CSAFPID-5873840", "CSAFPID-5873841", "CSAFPID-5873842", "CSAFPID-5873843", "CSAFPID-5873844", "CSAFPID-5873845", "CSAFPID-5890281", "CSAFPID-5890282", "CSAFPID-5902091", "CSAFPID-5965331" ] } ], "title": "CVE-2026-33306" } ] }