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amqp091-go CVE-2026-77404

| EUVDEUVD-2026-80817 HIGH
Improper Encoding or Escaping of Output (CWE-116)
2026-09-16 GitHub_M
8.7
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
8.7 HIGH
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
6.6 MEDIUM

Config data-flow needing an untrusted path plus a non-default serialize/reparse round-trip supports AV:L/PR:L; impact is chiefly integrity of connection config (I:H) with only indirect confidentiality/availability (C:L/A:L).

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L
4.0 AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

5
Patch available
Sep 16, 2026 - 16:04 EUVD
Metadata Corrected
Sep 16, 2026 - 15:40 vuln.today
tag: Go added
POC Analysis Generated
Sep 16, 2026 - 15:20 vuln.today
Analysis Generated
Sep 16, 2026 - 15:12 vuln.today
CVE Published
Sep 16, 2026 - 14:40 cve.org
HIGH 8.7

DescriptionCVE.org

RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, URI.String in uri.go concatenates CertFile, KeyFile, CACertFile, and ServerName values directly into an AMQPS query string instead of encoding them as URL query parameters with url.Values. If an application accepts a TLS asset path containing ampersand or equals delimiters and later reparses the serialized URI with ParseURI, the embedded delimiters can create or overwrite connection options, including paths to TLS certificate, key, or CA files. This can corrupt connection configuration or select unintended local cryptographic assets. This issue is fixed in version 1.13.0.

AnalysisAI

Improper output encoding in the RabbitMQ amqp091-go Go client before 1.13.0 lets an attacker who can influence a TLS asset path value (CertFile, KeyFile, CACertFile, or ServerName) inject or overwrite AMQPS connection options whenever an application serializes a URI with URI.String() and later reparses it with ParseURI(). Because the values are concatenated into the query string without url.Values encoding, embedded '&' and '=' delimiters split into extra parameters that can redirect the client to different - but still pre-existing - local certificate, key, or CA files, corrupting connection configuration. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires an application using amqp091-go before 1.13.0 that (1) accepts a TLS asset path value - CertFile, KeyFile, CACertFile, or ServerName - containing '&' or '=' delimiter characters from an untrusted or attacker-influenceable source, and (2) serializes the AMQPS URI via URI.String() and then re-parses the serialized form with ParseURI() (a round-trip). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a moderate-severity data-handling flaw whose real-world risk is well below its headline 8.7 CVSS 4.0 score. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch: upgrade github.com/rabbitmq/amqp091-go to 1.13.0 or later, which switches URI.String() to url.Values encoding and adds a round-trip regression test; rebuild and redeploy any Go binary that links the library, since this is a library fix baked into the application rather than a broker-side change. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, inventory all applications using the RabbitMQ amqp091-go client and identify any versions prior to 1.13.0; immediately apply the vendor-released patch version 1.13.0 where feasible. …

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CVE-2026-77404 vulnerability details – vuln.today

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