Martin Preuss Gwenhywfar up to 5.14.1 TLV Decoder src/parser/tlv.c GWEN_TLV_Buffer_To_DB buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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4.3$0-$5k0.00+

Summaryinfo

A vulnerability classified as problematic has been found in Martin Preuss Gwenhywfar up to 5.14.1. The affected element is the function GWEN_TLV_Buffer_To_DB of the file src/parser/tlv.c of the component TLV Decoder. The manipulation leads to buffer overflow. This vulnerability is documented as CVE-2026-126048. The attack can be initiated remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Martin Preuss Gwenhywfar up to 5.14.1. This issue affects the function GWEN_TLV_Buffer_To_DB of the file src/parser/tlv.c of the component TLV Decoder. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer. Impacted is availability. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-126048 since 11/10/2026. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

Upgrading to version 5.14.2 eliminates this vulnerability.

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Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.3

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 4.6
CNA Vector (VulnCheck): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Yes
Local: Partially
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Gwenhywfar 5.14.2

Timelineinfo

11/10/2026 Advisory disclosed
11/10/2026 +0 days CVE reserved
11/10/2026 +0 days VulDB entry created
11/10/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Confirmed

CNA: VulnCheck
CVE: CVE-2026-126048 (🔒)

GCVE (CVE): GCVE-0-2026-126048
GCVE (VulDB): GCVE-100-433901

Entryinfo

Created: 11/10/2026 18:26
Changes: 11/10/2026 18:26 (78)
Complete: 🔍
Cache ID: 216::103

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