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Vulnerability record · CVE-2026-34155 · published 31 March 2026

CVE-2026-34155: Pengutronix rauc improper verification of cryptographic signature vulnerability

Pengutronix · Rauc

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.

7.2 CVSS 4.0 High EPSS 0.23% · top 87.7% CWE-196 · CWE-196CWE-347 · Improper verification of cryptographic signature
7.2CVSS 4.0 base score
0.23%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
24 Jul 2026Last modified by NVD

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.

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/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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/rauc/rauc/commit/4fb7c798d6ae412344fb8f8d310d773046af3441 Patch
https://github.com/rauc/rauc/releases/tag/v1.15.2 Release Notes
https://github.com/rauc/rauc/security/advisories/GHSA-6hj7-q844-m2hx MitigationPatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

6.6CVE-2020-25860Pengutronix rauc toctou race condition vulnerabilityThe install.c module in the Pengutronix RAUC update client prior to version 1.5 has a Time-of-Check Time-of-Use vulnerability, where signature verifi…EPSS 1.4%

Source: NIST National Vulnerability Database (record CVE-2026-34155), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.