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Vulnerability · Published Mar 31, 2026 · Assigned by GitHub_M

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

High 7.2

In plain English

A high-severity security flaw in rauc from rauc. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)7.2High
Exploit odds (30 days)0.1%top 96.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12raucno fix listedDEBIAN-CVE-2026-34155
Debian:13rauc1.13-3+deb13u1DEBIAN-CVE-2026-34155
Debian:14rauc1.15.2-1DEBIAN-CVE-2026-34155
Ubuntu:22.04:LTSraucno fix listedUBUNTU-CVE-2026-34155
Ubuntu:24.04:LTSraucno fix listedUBUNTU-CVE-2026-34155
Ubuntu:25.10raucno fix listedUBUNTU-CVE-2026-34155
Ubuntu:26.04:LTSraucno fix listedUBUNTU-CVE-2026-34155
Ubuntu:26.10raucno fix listedUBUNTU-CVE-2026-34155

Affected products (as reported)

VendorProductVersions
rauc rauc < 1.15.2

Weakness: CWE-196, CWE-347 · Vector: 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

References