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CVE-2026-44905— Vanetza: Remote Denial of Service via Uncaught OER Encoding Exception in Cryptographic Verification

Quick assessment

Affected
riebl vanetza
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Vanetza是Raphael Riebl个人开发者的一个车载通信协议套件的开源实现。 Vanetza 26.02及之前版本存在安全漏洞，该漏洞源于ASN.1解码器接受语法有效但语义违反约束的V2X消息，当StraightVerifyService尝试重新编码签名证书时，检测到语义违规并抛出未捕获的std::runtime_error，导致进程终止。

CVSS 7.5 · High EPSS 0.20% · P10

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
riebl vanetza < e1a2e2709210d309458c3d77f98d50dec26c0df0 affected
<= 26.02 affected
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I. Basic Information for CVE-2026-44905

Vulnerability Information
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Vulnerability Title
Vanetza: Remote Denial of Service via Uncaught OER Encoding Exception in Cryptographic Verification
Source: CVE Program / CVE List V5
Vulnerability Description
Vanetza is an open-source implementation of the ETSI C-ITS protocol suite. In 26.02 and earlier, a denial-of-service vulnerability was identified in the cryptographic verification pipeline of Vanetza. When processing incoming V2X messages, the ASN.1 decoder accepts the structure as syntactically valid. However, this reveals a logic-based protocol failure where semantic constraints on specific fields are only strictly enforced during OER re-encoding. Specifically, if a crafted packet contains a certificate where the Psid (Provider Service Identifier) sub-type violates subtype constraints (e.g., out-of-range or invalid CHOICE variant), it is accepted during initial parsing, where subtype constraints are not enforced. Later, when StraightVerifyService attempts to calculate a message hash for cryptographic verification, it must re-encode the signing certificate. The underlying ASN.1 wrapper (asn1c_wrapper.cpp) detects the semantic violation during encoding and raises a std::runtime_error. This exception is not caught within the encoding path and propagates to std::terminate, resulting in immediate process termination. This vulnerability is fixed with commit e1a2e2709210d309458c3d77f98d50dec26c0df0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5
Vulnerability Title
Vanetza 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Vanetza是Raphael Riebl个人开发者的一个车载通信协议套件的开源实现。 Vanetza 26.02及之前版本存在安全漏洞，该漏洞源于ASN.1解码器接受语法有效但语义违反约束的V2X消息，当StraightVerifyService尝试重新编码签名证书时，检测到语义违规并抛出未捕获的std::runtime_error，导致进程终止。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
riebl vanetza < e1a2e2709210d309458c3d77f98d50dec26c0df0 -

II. Public POCs for CVE-2026-44905

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 15097 chars
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III. Intelligence Information for CVE-2026-44905

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Patches & Fixes for CVE-2026-44905 (1)

Vendor Advisories for CVE-2026-44905 (1)

IV. Related Vulnerabilities

Same product: vanetza
Same vendor: riebl
Same weakness: CWE-248

V. Comments for CVE-2026-44905

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