{"affected":[{"defaultStatus":"unaffected","ecosystem":"github","packageName":"aqbanking/gwenhywfar","product":"Gwenhywfar","source":"CNA: VulnCheck","vendor":"Martin Preuss","versions":[{"lessThan":"5.14.2","status":"affected","version":"4.99.8beta","versionType":"custom"}]}],"cveId":"CVE-2026-126048","cwes":["CWE-121"],"description":"Gwenhywfar 4.99.8beta before 5.14.2 contains a stack-based buffer overflow in GWEN_TLV_Buffer_To_DB() in src/parser/tlv.c when decoding BER-TLV tags into a fixed 128-byte buffer. Attackers can supply a record with about 127 or more tag continuation bytes or a truncated multi-byte tag, such as via a malicious chip card's EF_SSD file read by libchipcard's ZKA driver, to crash the application.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":5.1,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},{"score":4.6,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},{"score":5.1,"severity":"medium","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","version":"4.0"},{"score":4.6,"severity":"medium","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1794331051473,"publishedAt":1794329883611,"references":[{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/aqbanking/gwenhywfar/commit/ed8e2f8cdc27fd5c1b629cf9c1f6b93b2e009757"},{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/aqbanking/gwenhywfar/commit/6b50388e6b4a96f02d3d56e1d7747405fa881f39"},{"source":"CNA: VulnCheck","tags":["product"],"url":"https://www.aquamaniac.de/rdm/projects/gwenhywfar/files"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/aqbanking/gwenhywfar/blob/424949d0c6e61028eaccd6e46e4c0c41931c2b2f/src/parser/tlv.c#L629-L655"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/gwenhywfar-4.99-8beta-before-5.14.2-stack-buffer-overflow-via-gwen-tlv-buffer-to-db"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/aqbanking/gwenhywfar/blob/424949d0c6e61028eaccd6e46e4c0c41931c2b2f/src/parser/tlv.c#L629-L655"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/aqbanking/gwenhywfar/commit/6b50388e6b4a96f02d3d56e1d7747405fa881f39"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/aqbanking/gwenhywfar/commit/ed8e2f8cdc27fd5c1b629cf9c1f6b93b2e009757"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.aquamaniac.de/rdm/projects/gwenhywfar/files"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/gwenhywfar-4.99-8beta-before-5.14.2-stack-buffer-overflow-via-gwen-tlv-buffer-to-db"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/aqbanking/gwenhywfar/commit/ed8e2f8cdc27fd5c1b629cf9c1f6b93b2e009757"},{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/aqbanking/gwenhywfar/commit/6b50388e6b4a96f02d3d56e1d7747405fa881f39"}],"revision":"49bb24c22c6fa8de82481fb076b4d0c6a14539a1c194ac20388e7ff2500a0c83","sources":[{"modifiedAt":1794329883611,"name":"CNA: VulnCheck","retrievedAt":1794330668450,"url":"https://www.cve.org/CVERecord?id=CVE-2026-126048"},{"modifiedAt":1794331051473,"name":"NVD","retrievedAt":1794336296198,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126048"}],"ssvc":null,"status":"published","title":"Gwenhywfar 4.99.8beta before 5.14.2 Stack Buffer Overflow via GWEN_TLV_Buffer_To_DB()","updatedAt":1794336296198}