{"api_version":"1","generated_at":"2026-11-14T23:50:27+00:00","cve":"CVE-2026-124541","urls":{"html":"https://cve.report/CVE-2026-124541","api":"https://cve.report/api/cve/CVE-2026-124541.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-124541","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-124541"},"summary":{"title":"JSON::XS versions before 4.05 for Perl leak the decoded part of a rejected long string in decode_str","description":"JSON::XS versions before 4.05 for Perl leak the decoded part of a rejected long string in decode_str.\n\nA string is decoded through a fixed-size buffer (16 KiB in 4.04), and each time the buffer fills its contents move into a new scalar. Nothing frees that scalar when the string is then rejected for a control character, an invalid escape, malformed UTF-8 or the end of the input.\n\nA process that keeps running after a failed decode retains the decoded part of each rejected string, with its size chosen by the sender. Repeated requests exhaust process memory.","state":"PUBLISHED","assigner":"CPANSec","published_at":"2026-11-14 12:17:43","updated_at":"2026-11-14 12:17:43"},"problem_types":["CWE-401","CWE-401 CWE-401 Missing Release of Memory after Effective Lifetime"],"metrics":[],"references":[{"url":"https://metacpan.org/release/MLEHMANN/JSON-XS-4.05/changes","name":"https://metacpan.org/release/MLEHMANN/JSON-XS-4.05/changes","refsource":"9b29abf9-4ab0-4765-b253-1875cd9b441e","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-124541","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124541","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[{"source":"CNA","time":"2026-11-13T00:00:00.000Z","lang":"en","value":"Version 4.05 released with fix."}],"solutions":[{"source":"CNA","title":"","value":"Upgrade to JSON-XS 4.05 or later.","time":"","lang":"en"}],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"collectionURL":"https://cpan.org/modules","defaultStatus":"unaffected","modules":["JSON::XS"],"packageName":"JSON-XS","packageURL":"pkg:cpan/JSON-XS","programFiles":["XS.xs"],"programRoutines":[{"name":"decode_str"}],"repo":"https://cvs.schmorp.de/JSON-XS/","versions":[{"lessThan":"4.05","status":"affected","version":"0","versionType":"custom"}]}],"descriptions":[{"lang":"en","value":"JSON::XS versions before 4.05 for Perl leak the decoded part of a rejected long string in decode_str.\n\nA string is decoded through a fixed-size buffer (16 KiB in 4.04), and each time the buffer fills its contents move into a new scalar. Nothing frees that scalar when the string is then rejected for a control character, an invalid escape, malformed UTF-8 or the end of the input.\n\nA process that keeps running after a failed decode retains the decoded part of each rejected string, with its size chosen by the sender. Repeated requests exhaust process memory."}],"problemTypes":[{"descriptions":[{"cweId":"CWE-401","description":"CWE-401 Missing Release of Memory after Effective Lifetime","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-11-14T11:53:12.301Z","orgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","shortName":"CPANSec"},"references":[{"tags":["release-notes"],"url":"https://metacpan.org/release/MLEHMANN/JSON-XS-4.05/changes"}],"solutions":[{"lang":"en","value":"Upgrade to JSON-XS 4.05 or later."}],"source":{"discovery":"UNKNOWN"},"timeline":[{"lang":"en","time":"2026-11-13T00:00:00.000Z","value":"Version 4.05 released with fix."}],"title":"JSON::XS versions before 4.05 for Perl leak the decoded part of a rejected long string in decode_str","x_generator":{"engine":"cpansec-cna-tool 0.1"}}},"cveMetadata":{"assignerOrgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","assignerShortName":"CPANSec","cveId":"CVE-2026-124541","datePublished":"2026-11-14T11:53:12.301Z","dateReserved":"2026-11-08T12:32:39.559Z","dateUpdated":"2026-11-14T11:53:12.301Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-11-14 12:17:43","lastModifiedDate":"2026-11-14 12:17:43","problem_types":["CWE-401","CWE-401 CWE-401 Missing Release of Memory after Effective Lifetime"],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"124541","Ordinal":"1","Title":"JSON::XS versions before 4.05 for Perl leak the decoded part of ","CVE":"CVE-2026-124541","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"124541","Ordinal":"1","NoteData":"JSON::XS versions before 4.05 for Perl leak the decoded part of a rejected long string in decode_str.\n\nA string is decoded through a fixed-size buffer (16 KiB in 4.04), and each time the buffer fills its contents move into a new scalar. Nothing frees that scalar when the string is then rejected for a control character, an invalid escape, malformed UTF-8 or the end of the input.\n\nA process that keeps running after a failed decode retains the decoded part of each rejected string, with its size chosen by the sender. Repeated requests exhaust process memory.","Type":"Description","Title":"JSON::XS versions before 4.05 for Perl leak the decoded part of "}]}}}