{ "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-2026-4177", "tracking": { "current_release_date": "2026-04-03T00:31:52.020094Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-4177", "initial_release_date": "2026-03-16T23:24:49.214698Z", "revision_history": [ { "date": "2026-03-16T23:24:49.214698Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| References created (2).| CWES updated (1)." }, { "date": "2026-03-16T23:24:53.410431Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-16T23:39:19.318062Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products created (1).| References created (2).| CWES updated (1)." }, { "date": "2026-03-16T23:39:24.052558Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-17T02:24:52.184217Z", "number": "5", "summary": "References created (1)." }, { "date": "2026-03-17T02:38:40.663534Z", "number": "6", "summary": "References created (1)." }, { "date": "2026-03-17T06:43:20.217485Z", "number": "7", "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products connected (2)." }, { "date": "2026-03-17T06:43:23.999752Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-03-17T07:34:46.237825Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-03-17T12:31:48.863774Z", "number": "10", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (6).| Product Identifiers created (3).| Product Remediations created (6).| References created (4).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-03-17T12:31:58.130731Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-03-17T14:31:03.937439Z", "number": "12", "summary": "CVSS created." }, { "date": "2026-03-17T14:39:19.845289Z", "number": "13", "summary": "CVSS created.| Unknown change." }, { "date": "2026-03-17T14:58:04.270927Z", "number": "14", "summary": "Source created.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-20T09:26:46.447422Z", "number": "15", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-20T09:26:49.790234Z", "number": "16", "summary": "NCSC Score updated." }, { "date": "2026-03-23T00:43:34.075342Z", "number": "17", "summary": "Products created (1).| Product Identifiers created (1).| Products removed (1)." }, { "date": "2026-03-24T10:14:50.827184Z", "number": "18", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| Product Identifiers created (1).| References created (3).| CWES updated (1)." }, { "date": "2026-03-24T10:14:53.522157Z", "number": "19", "summary": "NCSC Score updated." }, { "date": "2026-04-01T11:29:06.377421Z", "number": "20", "summary": "Source created.| CVE status created. (valid)| Products connected (2).| Products created (1).| References created (5)." }, { "date": "2026-04-01T11:29:08.810992Z", "number": "21", "summary": "NCSC Score updated." }, { "date": "2026-04-02T08:05:45.976435Z", "number": "22", "summary": "Products connected (1).| Product Identifiers created (1).| References created (1)." }, { "date": "2026-04-02T08:05:48.934992Z", "number": "23", "summary": "NCSC Score updated." }, { "date": "2026-04-03T00:31:42.104185Z", "number": "24", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| Product Identifiers created (14).| Product Remediations created (8).| Products created (3).| Product Identifiers removed (10).| References created (9).| CWES updated (1)." }, { "date": "2026-04-03T00:31:50.675790Z", "number": "25", "summary": "NCSC Score updated." } ], "status": "interim", "version": "25" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-1330296", "product_identification_helper": { "cpe": "cpe:/o:amazon:linux_2:-" } } } ], "category": "product_name", "name": "Amazon Linux 2" } ], "category": "vendor", "name": "Amazon" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/6", "product": { "name": "vers:rpm/6", "product_id": "CSAFPID-1439321", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:6" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 6" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/7", "product": { "name": "vers:rpm/7", "product_id": "CSAFPID-1439315", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:7" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 7" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/8", "product": { "name": "vers:rpm/8", "product_id": "CSAFPID-1439317", "product_identification_helper": { "cpe": "cpe:/a:redhat:enterprise_linux:8" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 8" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/8", "product": { "name": "vers:rpm/8", "product_id": "CSAFPID-1437608", "product_identification_helper": { "cpe": "cpe:/a:redhat:enterprise_linux:8::crb" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux CRB (v. 8)" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/1.30-6.el8_10", "product": { "name": "vers:rpm/1.30-6.el8_10", "product_id": "CSAFPID-5986056", "product_identification_helper": { "purl": "pkg:rpm/redhat/perl-YAML-Syck@1.30-6.el8_10?arch=x86_64" } } } ], "category": "product_name", "name": "perl-YAML-Syck" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/1.30-6.el8_10", "product": { "name": "vers:rpm/1.30-6.el8_10", "product_id": "CSAFPID-5986057", "product_identification_helper": { "purl": "pkg:rpm/redhat/perl-YAML-Syck-debuginfo@1.30-6.el8_10?arch=x86_64" } } } ], "category": "product_name", "name": "perl-YAML-Syck-debuginfo" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/1.30-6.el8_10", "product": { "name": "vers:rpm/1.30-6.el8_10", "product_id": "CSAFPID-5986058", "product_identification_helper": { "purl": "pkg:rpm/redhat/perl-YAML-Syck-debugsource@1.30-6.el8_10?arch=x86_64" } } } ], "category": "product_name", "name": "perl-YAML-Syck-debugsource" } ], "category": "product_family", "name": "Red Hat Enterprise Linux" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5103280" } } ], "category": "product_name", "name": "perl-YAML-Syck" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 6" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5103282" } } ], "category": "product_name", "name": "perl-YAML-Syck" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 7" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5103283" } } ], "category": "product_name", "name": "perl-YAML-Syck" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 8" } ], "category": "vendor", "name": "Red Hat" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<=1.36", "product": { "name": "vers:unknown/<=1.36", "product_id": "CSAFPID-5830399" } } ], "category": "product_name", "name": "YAML::Syck" } ], "category": "vendor", "name": "TODDR" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<110.0.93", "product": { "name": "vers:unknown/<110.0.93", "product_id": "CSAFPID-5972052" } }, { "category": "product_version_range", "name": "vers:unknown/<126.0.50", "product": { "name": "vers:unknown/<126.0.50", "product_id": "CSAFPID-5972051" } }, { "category": "product_version_range", "name": "vers:unknown/<134.0.13", "product": { "name": "vers:unknown/<134.0.13", "product_id": "CSAFPID-5972655" } } ], "category": "product_name", "name": "cPanel/WHM" } ], "category": "vendor", "name": "cPanel" }, { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/1.34-2+deb12u2", "product": { "name": "vers:deb/1.34-2+deb12u2", "product_id": "CSAFPID-5890278", "product_identification_helper": { "purl": "pkg:deb/debian/libyaml-syck-perl@1.34-2+deb12u2?distro=bookworm" } } } ], "category": "product_name", "name": "libyaml-syck-perl" } ], "category": "product_family", "name": "bookworm" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-5078412" } } ], "category": "product_name", "name": "libyaml-syck-perl" } ], "category": "product_family", "name": "bullseye" } ], "category": "vendor", "name": "debian" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<1.37", "product": { "name": "vers:unknown/<1.37", "product_id": "CSAFPID-5897403", "product_identification_helper": { "cpe": "cpe:2.3:a:toddr:yaml\\:\\:syck:*:*:*:*:*:perl:*:*" } } } ], "category": "product_name", "name": "yaml\\:\\:syck" } ], "category": "vendor", "name": "toddr" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-4177", "cwe": { "id": "CWE-122", "name": "Heap-based Buffer Overflow" }, "notes": [ { "category": "description", "text": "YAML::Syck versions through 1.36 for Perl has several potential security vulnerabilities including a high-severity heap buffer overflow in the YAML emitter.\n\nThe heap overflow occurs when class names exceed the initial 512-byte allocation.\n\nThe base64 decoder could read past the buffer end on trailing newlines.\n\nstrtok mutated n->type_id in place, corrupting shared node data.\n\nA memory leak occurred in syck_hdlr_add_anchor when a node already had an anchor. The incoming anchor string 'a' was leaked on early return.", "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-4177" }, { "category": "description", "text": "YAML::Syck versions through 1.36 for Perl has several potential security vulnerabilities including a high-severity heap buffer overflow in the YAML emitter.\n\nThe heap overflow occurs when class names exceed the initial 512-byte allocation.\n\nThe base64 decoder could read past the buffer end on trailing newlines.\n\nstrtok mutated n->type_id in place, corrupting shared node data.\n\nA memory leak occurred in syck_hdlr_add_anchor when a node already had an anchor. The incoming anchor string 'a' was leaked on early return.", "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-4177" }, { "category": "description", "text": "YAML::Syck versions through 1.36 for Perl has several potential security vulnerabilities including a high-severity heap buffer overflow in the YAML emitter. The heap overflow occurs when class names exceed the initial 512-byte allocation. The base64 decoder could read past the buffer end on trailing newlines. strtok mutated n->type_id in place, corrupting shared node data. A memory leak occurred in syck_hdlr_add_anchor when a node already had an anchor. The incoming anchor string 'a' was leaked on early return.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-4177" }, { "category": "description", "text": "Multiple security issues have been discovered in the perl YAML::Syck module. A heap overflow occurs when class names exceed the initial 512-byte allocation, a base64 decoder could read past the buffer end on trailing newlines. strtok mutated n->type_id in place, corrupting shared node data, and a memory leak occurred in syck_hdlr_add_anchor when a node already had an anchor. The incoming anchor string 'a' was leaked on early return.", "title": "redhat - https://access.redhat.com/security/cve/CVE-2026-4177" }, { "category": "description", "text": "YAML::Syck versions through 1.36 for Perl has several potential security vulnerabilities including a high-severity heap buffer overflow in the YAML emitter.\n\nThe heap overflow occurs when class names exceed the initial 512-byte allocation.\n\nThe base64 decoder could read past the buffer end on trailing newlines.\n\nstrtok mutated n->type_id in place, corrupting shared node data.\n\nA memory leak occurred in syck_hdlr_add_anchor when a node already had an anchor. The incoming anchor string 'a' was leaked on early return.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-4177" }, { "category": "description", "text": "Multiple security issues have been discovered in the perl YAML::Syck module. A heap overflow occurs when class names exceed the initial 512-byte allocation, a base64 decoder could read past the buffer end on trailing newlines. strtok mutated n->type_id in place, corrupting shared node data, and a memory leak occurred in syck_hdlr_add_anchor when a node already had an anchor. The incoming anchor string 'a' was leaked on early return.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/csaf/RHSA-2026:6470.json" }, { "category": "other", "text": "0.00014", "title": "EPSS" }, { "category": "other", "text": "4.2", "title": "NCSC Score" }, { "category": "other", "text": "VENDOR FIX as product remediation category, There is product data available from source Certbundde", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "There is product data available from source Debian, The value of the most recent EPSS score, There is product_remediation data available from source Redhat, Is related to (a version of) an uncommon product, Is related to a product by vendor Debian", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 3\n", "title": "Vendor assessment" } ], "product_status": { "first_fixed": [ "CSAFPID-5890278" ], "fixed": [ "CSAFPID-5986056", "CSAFPID-5986057", "CSAFPID-5986058" ], "known_affected": [ "CSAFPID-5830399", "CSAFPID-5078412", "CSAFPID-1439315", "CSAFPID-1439317", "CSAFPID-1439321", "CSAFPID-5103280", "CSAFPID-5103282", "CSAFPID-5103283", "CSAFPID-5897403", "CSAFPID-5972051", "CSAFPID-5972052", "CSAFPID-5972655", "CSAFPID-1330296" ] }, "references": [ { "category": "external", "summary": "Source - nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4177" }, { "category": "external", "summary": "Source raw - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-4177" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://www.cve.org/CVERecord?id=CVE-2026-4177" }, { "category": "external", "summary": "Source raw - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/4xxx/CVE-2026-4177.json" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-4177" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/security/cve/CVE-2026-4177" }, { "category": "external", "summary": "Source raw - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-4177.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-4177" }, { "category": "external", "summary": "Source raw - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-4177" }, { "category": "external", "summary": "Source - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0939.json" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/csaf/RHSA-2026:6470.json" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; redhat", "url": "https://github.com/cpan-authors/YAML-Syck/commit/e8844a31c8cf0052914b198fc784ed4e6b8ae69e.patch" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; redhat", "url": "https://metacpan.org/release/TODDR/YAML-Syck-1.37_01/changes#L21" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "http://www.openwall.com/lists/oss-security/2026/03/16/6" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-4177" }, { "category": "external", "summary": "Reference - redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4177" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0939.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0939" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://docs.cpanel.net/changelogs/110-change-log/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://docs.cpanel.net/changelogs/126-change-log/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://docs.cpanel.net/changelogs/134-change-log/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://alas.aws.amazon.com/AL2/ALAS2-2026-3216.html" }, { "category": "external", "summary": "Reference - redhat", "url": "https://access.redhat.com/security/cve/CVE-2026-4177" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2448277" }, { "category": "external", "summary": "Reference - redhat", "url": "https://access.redhat.com/errata/RHSA-2026:6470" }, { "category": "external", "summary": "Reference - redhat", "url": "https://access.redhat.com/security/updates/classification/#important" }, { "category": "external", "summary": "Reference - redhat", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_6470.json" } ], "remediations": [ { "category": "mitigation", "details": "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.", "product_ids": [ "CSAFPID-1439315", "CSAFPID-1439317", "CSAFPID-1439321", "CSAFPID-5103280", "CSAFPID-5103282", "CSAFPID-5103283" ] }, { "category": "vendor_fix", "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258", "product_ids": [ "CSAFPID-1437608", "CSAFPID-5986056", "CSAFPID-5986057", "CSAFPID-5986058" ], "restart_required": { "category": "none" }, "url": "https://access.redhat.com/errata/RHSA-2026:6470" }, { "category": "workaround", "details": "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.", "product_ids": [ "CSAFPID-1437608", "CSAFPID-5986056", "CSAFPID-5986057", "CSAFPID-5986058" ] } ], "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:H", "baseScore": 9.1, "baseSeverity": "CRITICAL" }, "products": [ "CSAFPID-1330296", "CSAFPID-1439315", "CSAFPID-1439317", "CSAFPID-1439321", "CSAFPID-5078412", "CSAFPID-5103280", "CSAFPID-5103282", "CSAFPID-5103283", "CSAFPID-5830399", "CSAFPID-5897403", "CSAFPID-5972051", "CSAFPID-5972052", "CSAFPID-5972655" ] } ], "title": "CVE-2026-4177" } ] }