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CVE-2026-34155

RAUC: Improper Signing of Plain Bundles Exceeding 2 GiB

7.2 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
Passive

What an attacker can affect

Confidentiality
Low
Integrity
High
Availability
None

Exploit likelihood

0.15%Up 0.1 points since Apr 1, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.2

RAUC: Improper Signing of Plain Bundles Exceeding 2 GiB

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.

Record
CVE-2026-34155
CVSS 4.0
7.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:L/VI:H/VA:N/SC:H/SI:H/SA:H
Weakness
CWE-196, CWE-347
Updated
2026-11-02
EUVDEUVD-2026-17413 7.2

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.

Record
EUVD-2026-17413
CVSS 4.0
7.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:L/VI:H/VA:N/SC:H/SI:H/SA:H
Updated
2026-11-02
NVD 7.2

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.

Record
CVE-2026-34155
CVSS 4.0
7.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:L/VI:H/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-196, CWE-347
Updated
2026-11-02
OSV 7.2

RAUC: Improper Signing of Plain Bundles Exceeding 2 GiB

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.

Record
CVE-2026-34155
CVSS 4.0
7.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:L/VI:H/VA:N/SC:H/SI:H/SA:H
Weakness
CWE-196, CWE-347
Updated
2026-11-02
OSVDEBIAN-CVE-2026-34155 5.3

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.

Record
DEBIAN-CVE-2026-34155
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2026-34155 7.2

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.

Record
UBUNTU-CVE-2026-34155
CVSS 4.0
7.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:L/VI:H/VA:N/SC:H/SI:H/SA:H
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
rauc
Debian:12
All versions, plus listed versions
1.10.1-11.10.1-21.11-11.11.3-11.11.3-2
Show 10 moreShow less
1.12-11.13-11.13-21.13-31.14-11.15-11.15.1-11.15.2-11.8-21.9-1
None known
rauc
Debian:13
before 1.13-3+deb13u1, plus listed versions
1.13-3
1.13-3+deb13u1
rauc
Debian:14
before 1.15.2-1, plus listed versions
1.13-31.14-11.15-11.15.1-1
1.15.2-1
rauc
Ubuntu:20.04:LTS
All versions, plus listed versions
1.1-21.2-1
None known
rauc
Ubuntu:22.04:LTS
All versions, plus listed versions
1.5.1-11.5.1-1build11.6-1
None known
rauc
Ubuntu:24.04:LTS
All versions, plus listed versions
1.10.1-11.10.1-21.11-11.11-1build31.11.3-2
None known
rauc
Ubuntu:25.10
All versions, plus listed versions
1.13-11.13-3
None known
rauc
Ubuntu:26.10
All versions, plus listed versions
1.15.1-11.15.2-11.15.2-1ubuntu1
None known
rauc
Ubuntu:26.04:LTS
All versions, plus listed versions
1.13-31.14-11.15-11.15.1-1
None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-34155 is a high vulnerability (CVSS 7.2) in Pengutronix Rauc, published March 31, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.15%, the 3rd percentile. Fixed in rauc 1.13-3+deb13u1.

References

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