zephyrproject-rtos Zephyr up to 4.3 Crypto Driver length buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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3.8$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in zephyrproject-rtos Zephyr up to 4.3. This affects an unknown part of the component Crypto Driver. The manipulation of the argument length leads to buffer overflow. This vulnerability is traded as CVE-2026-0849. It is possible to launch the attack on the physical device. There is no exploit available.

Detailsinfo

A vulnerability was found in zephyrproject-rtos Zephyr up to 4.3. It has been rated as problematic. This issue affects an unknown code of the component Crypto Driver. The manipulation of the argument length 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, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Malformed ATAES132A responses with an oversized length field overflow a 52-byte stack buffer in the Zephyr crypto driver, allowing a compromised device or bus attacker to corrupt kernel memory and potentially hijack execution.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-0849 since 01/11/2026. The exploitation is known to be difficult. An attack has to be approached locally. Technical details are known, but no exploit is available.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-12186). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.8
VulDB Meta Temp Score: 3.8

VulDB Base Score: 3.8
VulDB Temp Score: 3.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 3.8
CNA Vector (zephyr): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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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: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

01/11/2026 CVE reserved
03/14/2026 +62 days Advisory disclosed
03/14/2026 +0 days VulDB entry created
03/20/2026 +6 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-0849 (🔒)
GCVE (CVE): GCVE-0-2026-0849
GCVE (VulDB): GCVE-100-351089
EUVD: 🔒

Entryinfo

Created: 03/14/2026 23:02
Updated: 03/20/2026 22:23
Changes: 03/14/2026 23:02 (64), 03/15/2026 00:13 (1), 03/20/2026 22:23 (1)
Complete: 🔍
Cache ID: 216:72D:103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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