{"id":"CVE-2026-126049","state":"PUBLISHED","title":"Gwenhywfar 5.14.2 Use-After-Free via GWEN_TLV_Buffer_To_DB() Nested BER-TLV Parsing","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.","publishedAt":"2026-11-10T16:58:04.296Z","updatedAt":"2026-11-10T16:58:04.296Z","severity":{"score":5.1,"label":"Medium","version":"4.0","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","source":"VulnCheck"},"assigner":"VulnCheck","products":["Martin Preuss Gwenhywfar"],"affected":[{"vendor":"Martin Preuss","product":"Gwenhywfar","packageURL":"pkg:github/aqbanking/gwenhywfar","defaultStatus":"unaffected","versions":[{"version":"5.14.2","status":"affected","lessThan":"5.14.3","versionType":"custom"}],"repo":"https://github.com/aqbanking/gwenhywfar"}],"references":["https://github.com/aqbanking/gwenhywfar/commit/828b34135dfa33fc347a2929caa2f079ffb00738","https://github.com/aqbanking/gwenhywfar/commit/dc8b80945e877f5bdf2d2ae1b50c928c15e990b0","https://www.aquamaniac.de/rdm/projects/gwenhywfar/files","https://github.com/aqbanking/gwenhywfar/blob/f5c3f9dc56aa20cab85fd149885474239cf68632/src/parser/tlv.c#L651-L672","https://www.vulncheck.com/advisories/gwenhywfar-5.14.2-use-after-free-via-gwen-tlv-buffer-to-db-nested-ber-tlv-parsing"],"weaknesses":["CWE-416"],"ingestedAt":"2026-11-10T17:08:07.291Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/126xxx/CVE-2026-126049.json","commit":"c014ea22156f144a220e560a1a0daba0b213cb30","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-126049","state":"PUBLISHED","datePublished":"2026-11-10T16:58:04.296Z","dateUpdated":"2026-11-10T16:58:04.296Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-11-10T16:53:12.633Z"},"containers":{"cna":{"title":"Gwenhywfar 5.14.2 Use-After-Free via GWEN_TLV_Buffer_To_DB() Nested BER-TLV Parsing","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Martin Preuss","product":"Gwenhywfar","packageURL":"pkg:github/aqbanking/gwenhywfar","defaultStatus":"unaffected","versions":[{"version":"5.14.2","status":"affected","lessThan":"5.14.3","versionType":"custom"}],"repo":"https://github.com/aqbanking/gwenhywfar"}],"references":[{"url":"https://github.com/aqbanking/gwenhywfar/commit/828b34135dfa33fc347a2929caa2f079ffb00738","tags":["patch"]},{"url":"https://github.com/aqbanking/gwenhywfar/commit/dc8b80945e877f5bdf2d2ae1b50c928c15e990b0","tags":["release-notes","patch"]},{"url":"https://www.aquamaniac.de/rdm/projects/gwenhywfar/files","tags":["product"]},{"url":"https://github.com/aqbanking/gwenhywfar/blob/f5c3f9dc56aa20cab85fd149885474239cf68632/src/parser/tlv.c#L651-L672","tags":["technical-description"]},{"url":"https://www.vulncheck.com/advisories/gwenhywfar-5.14.2-use-after-free-via-gwen-tlv-buffer-to-db-nested-ber-tlv-parsing","name":"VulnCheck Advisory: Gwenhywfar 5.14.2 Use-After-Free via GWEN_TLV_Buffer_To_DB() Nested BER-TLV Parsing","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"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","attackVector":"PHYSICAL","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":5.1,"baseSeverity":"MEDIUM"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","attackVector":"PHYSICAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":4.6,"baseSeverity":"MEDIUM"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","lang":"en","description":"Use After Free","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-11-10T16:58:04.296Z"},"datePublic":"2026-11-10T00:00:00.000Z","credits":[{"lang":"en","value":"Deus Rex","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}}}}}