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CVE-2026-34155— RAUC: Improper Signing of Plain Bundles Exceeding 2 GiB

Quick assessment

Affected
rauc rauc
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.

rauc是RAUC开源的一个嵌入式Linux系统的安全更新控制器。 RAUC 1.15.2之前版本存在数据伪造问题漏洞，该漏洞源于使用明文格式且有效载荷大小超过2 GiB的RAUC捆绑包会导致整数溢出，可能导致签名仅覆盖有效载荷的前几个字节，允许攻击者修改签名未覆盖的部分。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.14% · P4

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-34155

Vulnerability Information
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Vulnerability Title
RAUC: Improper Signing of Plain Bundles Exceeding 2 GiB
Source: CVE Program / CVE List V5
Vulnerability Description
RAUC controls the update process on embedded Linux systems. Prior to version 1.15.2, RAUC bundles using the 'plain' format exceeding a payload size of 2 GiB cause an integer overflow which results in a signature which covers only the first few bytes of the payload. Given such a bundle with a legitimate signature, an attacker can modify the part of the payload which is not covered by the signature. This issue has been patched in version 1.15.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:L/VI:H/VA:N/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
无符号至有符号转换错误
Source: CVE Program / CVE List V5
Vulnerability Title
rauc 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
rauc是RAUC开源的一个嵌入式Linux系统的安全更新控制器。 RAUC 1.15.2之前版本存在数据伪造问题漏洞，该漏洞源于使用明文格式且有效载荷大小超过2 GiB的RAUC捆绑包会导致整数溢出，可能导致签名仅覆盖有效载荷的前几个字节，允许攻击者修改签名未覆盖的部分。
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
rauc rauc < 1.15.2 -

II. Public POCs for CVE-2026-34155

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III. Intelligence Information for CVE-2026-34155

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Patches & Fixes for CVE-2026-34155 (1)

Vendor Advisories for CVE-2026-34155 (1)

IV. Related Vulnerabilities

Same weakness: CWE-196

V. Comments for CVE-2026-34155

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