{"affected":[{"defaultStatus":"unaffected","ecosystem":"github","packageName":"aqbanking/gwenhywfar","product":"Gwenhywfar","source":"CNA: VulnCheck","vendor":"Martin Preuss","versions":[{"lessThan":"5.14.3","status":"affected","version":"5.14.2","versionType":"custom"}]}],"cveId":"CVE-2026-126049","cwes":["CWE-416"],"description":"Gwenhywfar 5.14.2 contains a heap use-after-free vulnerability in GWEN_TLV_Buffer_To_DB() in src/parser/tlv.c, which frees a nested record's GWEN_DB node when parsing of its contents fails but continues processing and adds the freed node to the parent instead of returning. Attackers can supply a constructed BER-TLV record with unparseable contents, such as via a malicious chip card read by libchipcard, to corrupt heap memory.","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":1794331051803,"publishedAt":1794329884296,"references":[{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/aqbanking/gwenhywfar/commit/828b34135dfa33fc347a2929caa2f079ffb00738"},{"source":"CNA: VulnCheck","tags":["release-notes","patch"],"url":"https://github.com/aqbanking/gwenhywfar/commit/dc8b80945e877f5bdf2d2ae1b50c928c15e990b0"},{"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/f5c3f9dc56aa20cab85fd149885474239cf68632/src/parser/tlv.c#L651-L672"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/gwenhywfar-5.14.2-use-after-free-via-gwen-tlv-buffer-to-db-nested-ber-tlv-parsing"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/aqbanking/gwenhywfar/blob/f5c3f9dc56aa20cab85fd149885474239cf68632/src/parser/tlv.c#L651-L672"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/aqbanking/gwenhywfar/commit/828b34135dfa33fc347a2929caa2f079ffb00738"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/aqbanking/gwenhywfar/commit/dc8b80945e877f5bdf2d2ae1b50c928c15e990b0"},{"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-5.14.2-use-after-free-via-gwen-tlv-buffer-to-db-nested-ber-tlv-parsing"}],"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/828b34135dfa33fc347a2929caa2f079ffb00738"},{"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/dc8b80945e877f5bdf2d2ae1b50c928c15e990b0"}],"revision":"ee78be3574739bd6bfd56aa5977af78dc777cf57d70bb669cace4e16c6498bb8","sources":[{"modifiedAt":1794329884296,"name":"CNA: VulnCheck","retrievedAt":1794330672347,"url":"https://www.cve.org/CVERecord?id=CVE-2026-126049"},{"modifiedAt":1794331051803,"name":"NVD","retrievedAt":1794336296775,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126049"}],"ssvc":null,"status":"published","title":"Gwenhywfar 5.14.2 Use-After-Free via GWEN_TLV_Buffer_To_DB() Nested BER-TLV Parsing","updatedAt":1794336296775}