# CVE-2026-45542: ESF-IDF: Heap buffer overflow in protocomm Security2 over Bluetooth

> Heap buffer overflow in Espressif IDF protocomm allows attackers to corrupt memory via oversized Bluetooth SRP6a username fields.

- **Severity:** High 7.1 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Jun 2026
- **Updated:** 10 Jun 2026
- **Also known as:** GHSA-9r76-858f-v6jh

## What is CVE-2026-45542?

CVE-2026-45542 is a high-severity memory corruption vulnerability in espressif esp-idf, published on 10 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.2.6, 5.3.5, 5.4.4, 5.5.4, and 6.0, a heap buffer overflow exists in the Security Scheme 2 (SRP6a) session-setup path of the protocomm component. The first-phase handler (handle_session_command0() in components/protocomm/src/security/security2.c) trusts the length of a client-supplied protobuf field for the SRP6a username and copies it into a buffer whose size is derived from a narrower destination type. The resulting truncation-versus-copy asymmetry corrupts the heap when an oversized value is supplied. This issue has been patched in versions 5.2.7, 5.3.6, 5.4.5, 5.5.5, and 6.0.1.

Weakness: CWE-122 (Heap-based Buffer Overflow)

## Which versions are affected by CVE-2026-45542?

It affects 1 product.


Products: Espressif Esp-Idf.

## How do I fix CVE-2026-45542?

No fix has been published for CVE-2026-45542 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-45542 being exploited?

There is no known exploitation of CVE-2026-45542 in the wild and no public exploit code.

## Other vulnerabilities in espressif esp-idf

- [CVE-2026-45328](https://insights.sbomify.com/CVE-2026-45328/): ESF-IDF: Out-of-Bounds Write in ESP-TEE Secure Service Wrappers (critical 9.3)
- [CVE-2024-53406](https://insights.sbomify.com/CVE-2024-53406/): Auth bypass in n/a (high 8.8)
- [CVE-2021-28139](https://insights.sbomify.com/CVE-2021-28139/): Memory corruption in n/a (high 8.8)
- [CVE-2024-33453](https://insights.sbomify.com/CVE-2024-33453/): Information disclosure in n/a (high 8.1)
- [CVE-2019-12587](https://insights.sbomify.com/CVE-2019-12587/): Weak cryptography in n/a (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-45542 and fix it if it is affected.

What it is: CVE-2026-45542 is a high-severity memory corruption vulnerability in espressif esp-idf, published on 10 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-45542 in the wild and no public exploit code.

Affected product: espressif esp-idf. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-45542/ (Markdown: https://insights.sbomify.com/CVE-2026-45542/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-45542
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-45542
- OSV: https://osv.dev/vulnerability/CVE-2026-45542

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-45542/
Summaries are generated and may contain mistakes; the official description above is the record.