# CVE-2026-58227: TLS/DTLS denial of service via unbounded recursion on cross-signed peer certificate chain

Status: published. Published: 2026-07-27. Updated: 2026-11-11.

The Erlang/OTP ssl application does not detect cycles when reconstructing an incomplete peer certificate chain during a TLS or DTLS handshake. In ssl_certificate:handle_incomplete_chain/5, the received chain is passed to ssl_certificate:build_certificate_chain/5, which walks issuer relationships via ssl_certificate:do_certificate_chain/7 with no cycle detection and no depth limit. When the peer supplies two mutually cross-signed certificates in unordered form (A issues B, B issues A), the issuer lookup alternates between the two certificates and the pair of functions recurses indefinitely, growing the call stack and chain accumulator without bound.

An unauthenticated remote attacker can send a crafted certificate chain in a TLS or DTLS Certificate handshake message to exhaust available memory and crash the BEAM node. Only a TCP connection and a partial handshake are required; no authentication or completed handshake is needed, and both TLS/DTLS servers and clients are affected when processing peer certificate messages.

This issue affects OTP from OTP 23.2 before OTP 27.3.4.15, OTP 28.5.0.4, and OTP 29.0.4, corresponding to ssl from 10.2 before 11.2.12.11, 11.6.0.4, and 11.7.4.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: EEF) — https://github.com/erlang/otp/commit/7db64720177961e04545681480d691c4be81c54d
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: EEF) — https://github.com/erlang/otp/commit/241d43703989fec4b6bf637beaeb366d92dcc4c2
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: EEF) — https://github.com/erlang/otp/commit/0307bff2c72b685c6bd952daaac6bd661c247d62

## Affected products and versions

- Erlang / OTP (otp): ≥ 23.2; < * (affected, otp); unaffected at 27.3.4.15; unaffected at 28.5.0.4; unaffected at 29.0.4. Source: CNA: EEF
- Erlang / OTP (ssl): ≥ 10.2; < * (affected, otp); unaffected at 11.2.12.11; unaffected at 11.6.0.4; unaffected at 11.7.4. Source: CNA: EEF
- Erlang / OTP (erlang/otp): ≥ addc42df113f8f15fc20e9dff45490b3ce0d3d6b; < * (affected, git); unaffected at 7db64720177961e04545681480d691c4be81c54d; unaffected at 241d43703989fec4b6bf637beaeb366d92dcc4c2; unaffected at 0307bff2c72b685c6bd952daaac6bd661c247d62. Source: CNA: EEF

## Severity and prioritization

- CVSS 4.0: 8.7 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N; source: CNA: EEF

- CISA KEV: No listing in collected sources

- EPSS: 0.39% as of 2026-11-10; percentile 33.15%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-674

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/erlang/otp/security/advisories/GHSA-r5jr-mq46-vmhw (CNA: EEF; vendor-advisory, related)

- https://cna.erlef.org/cves/CVE-2026-58227.html (CNA: EEF; related)

- https://osv.dev/vulnerability/EEF-CVE-2026-58227 (CNA: EEF; related)

- https://www.erlang.org/doc/system/versions.html#order-of-versions (CNA: EEF; x_version-scheme)

- https://github.com/erlang/otp/commit/addc42df113f8f15fc20e9dff45490b3ce0d3d6b (CNA: EEF; related)

- https://github.com/erlang/otp/commit/7db64720177961e04545681480d691c4be81c54d (CNA: EEF; patch)

- https://github.com/erlang/otp/commit/241d43703989fec4b6bf637beaeb366d92dcc4c2 (CNA: EEF; patch)

- https://github.com/erlang/otp/commit/0307bff2c72b685c6bd952daaac6bd661c247d62 (CNA: EEF; patch)

## Provenance

- CNA: EEF: https://www.cve.org/CVERecord?id=CVE-2026-58227; retrieved 2026-11-11; source updated 2026-11-11

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-58227; retrieved 2026-11-11; source updated Not reported

Revision: af10d44929f100cb2b4aaf222850945f65e7ad4c006cdfab8f7e9af974ce04fb

Canonical: https://y2.dev/cve/CVE-2026-58227

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.