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CVE-2026-126049— Gwenhywfar 5.14.2 Use-After-Free via GWEN_TLV_Buffer_To_DB() Nested BER-TLV Parsing

Quick assessment

Affected
Martin Preuss Gwenhywfar
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Gwenhywfar 5.14.2 版本在 文件中的 函数存在堆释放后使用（heap use-after-free）漏洞。该漏洞表现为：当解析嵌套记录的内容失败时，函数会释放该记录对应的 节点，但并未终止处理流程，而是继续执行并将已释放的节点添加到父节点中，而非返回错误。攻击者可构造包含无法解析内容的 BER-TLV 记录（例如通过 读取恶意芯片卡时传入），从而破坏堆内存。

CVSS 4.6 · Medium
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I. Basic Information for CVE-2026-126049

Vulnerability Information
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Vulnerability Title
Gwenhywfar 5.14.2 Use-After-Free via GWEN_TLV_Buffer_To_DB() Nested BER-TLV Parsing
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Martin Preuss Gwenhywfar 5.14.2 ~ 5.14.3 -

II. Public POCs for CVE-2026-126049

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III. Intelligence Information for CVE-2026-126049

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Other References for CVE-2026-126049 (5)

IV. Related Vulnerabilities

Same product: Gwenhywfar
Same vendor: Martin Preuss
Same weakness: CWE-416