# A Signed Length Overflow in Erlang/OTP's inet TCP Driver Overflows the Receive Buffer Into BEAM VM Memory From an Unauthenticated Peer

CVE record · `CVE-2026-75538`

- **Identifiers:** `CVE-2026-75538`
- **State:** Confirmed
- **Severity:** CVSS 8.2 High
- **Critical:** No
- **CNA:** EEF
- **Weakness (CWE):** [CWE-122](https://cwe.mitre.org/data/definitions/122.html) · [CWE-190](https://cwe.mitre.org/data/definitions/190.html)
- **Tags:** [Memory corruption](https://agentprime.io/advisories/tag/memory-corruption.md)
- **Technologies:** [Erlang OTP](https://agentprime.io/advisories/technology/erlang-otp.md)
- **Published:** 1 Sept 2026
- **Updated:** 8 Sept 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: EEF) at 1 Sept 2026, 14:48 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: Erlang. Product: OTP.
  - unknown: `before 17.0` (otp)
  - affected: `17.0 to before 27.3.4.17` (otp)
  - affected: `28.0 to before 28.5.0.6` (otp)
  - affected: `29.0 to before 29.0.6` (otp)
  - Other versions: unaffected
  - Package name: `otp`
  - purl: `pkg:software-id/erlang.org/otp`
- Vendor: Erlang. Product: OTP.
  - unknown: `before 6.0` (otp)
  - affected: `6.0 to before 15.2.7.13` (otp)
  - affected: `16.0 to before 16.4.0.6` (otp)
  - affected: `17.0 to before 17.0.6` (otp)
  - Other versions: unaffected
  - Package name: `erts`
  - purl: `pkg:otp/erts`
- Vendor: Erlang. Product: OTP.
  - affected: `84adefa331c4159d432d22840663c38f155cd4c1 to before 08e8efdba8500d2d6f54c6b1de1492b228017c9b` (git)
  - Other versions: unaffected
  - Package name: `erlang/otp`
  - Collection: `https://github.com`
  - purl: `pkg:github/erlang/otp`

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

- 8.2 High, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`, from CNA (EEF)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0085, the 58th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 1 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-75538](https://www.cve.org/CVERecord?id=CVE-2026-75538)
- [NVD: CVE-2026-75538](https://nvd.nist.gov/vuln/detail/CVE-2026-75538)

### References from the CNA

- <https://github.com/erlang/otp/security/advisories/GHSA-8m6r-2pj2-25pm> (vendor-advisory)
- <https://cna.erlef.org/cves/CVE-2026-75538.html> (related)
- <https://osv.dev/vulnerability/EEF-CVE-2026-75538> (related)
- <https://github.com/erlang/otp/commit/08e8efdba8500d2d6f54c6b1de1492b228017c9b> (patch)

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-75538>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-75538/>. Everything for agents: <https://agentprime.io/llms.txt>.