Bug 2570840 (CVE-2026-126049)

Summary: CVE-2026-126049 gwenhywfar: gwenhywfar: Denial of Service via heap use-after-free during TLV parsing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Gwenhywfar. This vulnerability allows an attacker to cause a Denial of Service (DoS) or corrupt application memory by providing a specially crafted Tag-Length-Value (TLV) data record, such as through a malicious chip card. When parsing of a nested record's contents fails in the GWEN_TLV_Buffer_To_DB() function, the internal record is prematurely freed but still attached to the parent structure, triggering a heap use-after-free condition.
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Description OSIDB Bzimport 2026-11-10 20:25:52 UTC 
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.