---
title: "CVE-2026-77405: RabbitMQ amqp091-go: Missing Explicit TLS Minimum Version Configuration In URI Parser"
url: https://erroneo.us/security/cve/CVE-2026-77405/
description: "CVE-2026-77405 (github.com/rabbitmq/amqp091-go (Go)): RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, tlsConfigFromURI in uri.go creates…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-09-16
date_modified: 2026-09-18
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-77405"
kev: false
cvss: 9.4
epss: 0.00282
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-77405: RabbitMQ amqp091-go: Missing Explicit TLS Minimum Version Configuration In URI Parser

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.3% , percentile 20: FIRST’s model estimates a 0.3% chance of exploitation activity in the next 30 days, higher than 20% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes github.com/rabbitmq/amqp091-go (Go) < 1.13.0, fixed in 1.13.0 . Check your lockfile, including transitive dependencies.

## What it is

RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, tlsConfigFromURI in uri.go creates tls.Config values without setting MinVersion to tls.VersionTLS12. Builds using a Go runtime whose default permits TLS 1.0 or TLS 1.1 can therefore negotiate an obsolete protocol version when connecting through an amqps URI. A network attacker able to influence TLS negotiation with such a legacy build may weaken transport protection for AMQP messages and credentials. This issue is fixed in version 1.13.0.

## Affected packages

- Go `github.com/rabbitmq/amqp091-go` < 1.13.0 → fixed: 1.13.0

## Affected products (CVE record)

- rabbitmq amqp091-go: < 1.13.0

## Severity

- GitHub_M CVSS 4.0: 9.4 `CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:L/SA:N`
- GitHub CVSS 4.0: 9.4 `CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:L/SA:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.28% probability of exploitation activity in the next 30 days; percentile 20.

## Sources

- [GitHub Advisory GHSA-33mj-cw25-m34h](https://github.com/advisories/GHSA-33mj-cw25-m34h)
- [CVE.org record CVE-2026-77405](https://www.cve.org/CVERecord?id=CVE-2026-77405)
- [NVD entry CVE-2026-77405](https://nvd.nist.gov/vuln/detail/CVE-2026-77405)
- [github.com](https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-33mj-cw25-m34h)
- [github.com](https://github.com/rabbitmq/amqp091-go/pull/355)
- [github.com](https://github.com/rabbitmq/amqp091-go/commit/c9fd433ecac2e557919e51acc9d809390c402c6e)
- [github.com](https://github.com/rabbitmq/amqp091-go/releases/tag/v1.13.0)

---
Source page: https://erroneo.us/security/cve/CVE-2026-77405/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt