Vulnerability-Lookup

CVE-2026-77404 (GCVE-0-2026-77404)

Vulnerability from cvelistv5 – Published: 2026-09-16 14:40 – Updated: 2026-09-16 15:21

Title

RabbitMQ amqp091-go: Connection Configuration Overwrite via Unsanitized TLS Path Parameter Injection

Summary

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.

Severity

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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-16 15:21 UTC

CWE

CWE-116 - Improper Encoding or Escaping of Output

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/rabbitmq/amqp091-go/security/a…	x_refsource_CONFIRM
https://github.com/rabbitmq/amqp091-go/pull/352	x_refsource_MISC
https://github.com/rabbitmq/amqp091-go/commit/743…	x_refsource_MISC
https://github.com/rabbitmq/amqp091-go/releases/t…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
rabbitmq	amqp091-go	Affected: < 1.13.0	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-77404

Vulnerability from fkie_nvd - Published: 2026-09-16 15:17 - Updated: 2026-09-16 16:17

Severity

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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/rabbitmq/amqp091-go/commit/743d488e46955fe7ffc55506fe2c401d01216783
	security-advisories@github.com	https://github.com/rabbitmq/amqp091-go/pull/352
	security-advisories@github.com	https://github.com/rabbitmq/amqp091-go/releases/tag/v1.13.0
	security-advisories@github.com	https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-465g-fh3v-9jw4

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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          "product": "amqp091-go",
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    }
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GHSA-465G-FH3V-9JW4

Vulnerability from github – Published: 2026-09-17 17:03 – Updated: 2026-09-17 17:03

Summary

RabbitMQ amqp091-go: Connection Configuration Overwrite via Unsanitized TLS Path Parameter Injection

Details

Summary

A query parameter injection vulnerability exists in the AMQP client's connection URI formatting logic. When generating or parsing connection URIs, TLS-related filesystem paths (such as certificates or keys) are appended directly to the URI's query string using string concatenation rather than secure URL encoding via functions like url.QueryEscape.

If an application handles a TLS file path containing special character delimiters (such as & or =), these characters are interpreted as parameter separators by the URI parser. If the resulting URI.String() output is subsequently re-parsed via ParseURI, the injected fields can silently overwrite or hijack critical configuration parameters, forcing the client to use arbitrary connection settings or alternate TLS files.

Vulnerability Details

Mechanism

The vulnerability lies within the lack of proper escaping when compiling connection string components into a raw URL format:

// Example of insecure string concatenation during URI building
uri := fmt.Sprintf("amqps://user:pass@host/%s?certfile=%s&keyfile=%s", vhost, certPath, keyPath)

Because certPath and keyPath are not passed through url.QueryEscape, special URL characters preserve their control meanings. For instance, if a user supply a certificate path named: /tmp/cert=foo&keyfile=/evil/path

The generated string translates into: ...?certfile=/tmp/cert=foo&keyfile=/evil/path&keyfile=/original/path

When this string passes back through ParseURI (common in connection re-dial routines or configuration replication steps), standard URL parsing mechanics treat the string as multiple distinct parameters. Depending on map assignment order inside the parser, the injected keys take precedence over the original parameters.

Impact

By manipulating the file paths used for TLS assets, an attacker or compromised local sub-system can: * Inject arbitrary alternative options or override protocol settings. * Substitute or switch keyfiles, leading to connection failures or the parsing of unauthorized cryptographic assets. * Corrupt connection state variables, triggering application-layer failures during connection setup or recovery.

Attack Vector

An attacker who has partial control over directory naming conventions or environmental variables used to specify local infrastructure paths can execute a parameter injection attack:

Path Creation: An attacker sets up a path containing deliberate URL parameter delimiters (e.g., /var/lib/certs/client.crt?cacertfile=/tmp/fake_ca.crt&).
String Generation: The application serializes the active connection state or passes the paths down to an unescaped URI builder function.
Configuration Hijack: The URI string is generated with the injected parameter embedded into the query structure. When the client attempts to reuse or re-parse this connection string during a connection retry or worker spin-up, it parses the injected cacertfile parameter, loading a different, unverified Certificate Authority string.

Severity

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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/rabbitmq/amqp091-go"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.13.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-77404"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-116"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-17T17:03:55Z",
    "nvd_published_at": "2026-09-16T15:17:47Z",
    "severity": "HIGH"
  },
  "details": "## Summary\nA query parameter injection vulnerability exists in the AMQP client\u0027s connection URI formatting logic. When generating or parsing connection URIs, TLS-related filesystem paths (such as certificates or keys) are appended directly to the URI\u0027s query string using string concatenation rather than secure URL encoding via functions like `url.QueryEscape`.\n\nIf an application handles a TLS file path containing special character delimiters (such as `\u0026` or `=`), these characters are interpreted as parameter separators by the URI parser. If the resulting `URI.String()` output is subsequently re-parsed via `ParseURI`, the injected fields can silently overwrite or hijack critical configuration parameters, forcing the client to use arbitrary connection settings or alternate TLS files.\n\n---\n\n## Vulnerability Details\n\n### Mechanism\nThe vulnerability lies within the lack of proper escaping when compiling connection string components into a raw URL format:\n\n```go\n// Example of insecure string concatenation during URI building\nuri := fmt.Sprintf(\"amqps://user:pass@host/%s?certfile=%s\u0026keyfile=%s\", vhost, certPath, keyPath)\n```\n\nBecause `certPath` and `keyPath` are not passed through `url.QueryEscape`, special URL characters preserve their control meanings. For instance, if a user supply a certificate path named:\n`/tmp/cert=foo\u0026keyfile=/evil/path`\n\nThe generated string translates into:\n`...?certfile=/tmp/cert=foo\u0026keyfile=/evil/path\u0026keyfile=/original/path`\n\nWhen this string passes back through `ParseURI` (common in connection re-dial routines or configuration replication steps), standard URL parsing mechanics treat the string as multiple distinct parameters. Depending on map assignment order inside the parser, the injected keys take precedence over the original parameters.\n\n### Impact\nBy manipulating the file paths used for TLS assets, an attacker or compromised local sub-system can:\n* Inject arbitrary alternative options or override protocol settings.\n* Substitute or switch keyfiles, leading to connection failures or the parsing of unauthorized cryptographic assets.\n* Corrupt connection state variables, triggering application-layer failures during connection setup or recovery.\n\n---\n\n## Attack Vector\nAn attacker who has partial control over directory naming conventions or environmental variables used to specify local infrastructure paths can execute a parameter injection attack:\n\n1. **Path Creation:** An attacker sets up a path containing deliberate URL parameter delimiters (e.g., `/var/lib/certs/client.crt?cacertfile=/tmp/fake_ca.crt\u0026`).\n2. **String Generation:** The application serializes the active connection state or passes the paths down to an unescaped URI builder function.\n3. **Configuration Hijack:** The URI string is generated with the injected parameter embedded into the query structure. When the client attempts to reuse or re-parse this connection string during a connection retry or worker spin-up, it parses the injected `cacertfile` parameter, loading a different, unverified Certificate Authority string.",
  "id": "GHSA-465g-fh3v-9jw4",
  "modified": "2026-09-17T17:03:55Z",
  "published": "2026-09-17T17:03:55Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-465g-fh3v-9jw4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-77404"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rabbitmq/amqp091-go/pull/352"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rabbitmq/amqp091-go/commit/743d488e46955fe7ffc55506fe2c401d01216783"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rabbitmq/amqp091-go"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rabbitmq/amqp091-go/releases/tag/v1.13.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "RabbitMQ amqp091-go: Connection Configuration Overwrite via Unsanitized TLS Path Parameter Injection"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-77404 (GCVE-0-2026-77404)

FKIE_CVE-2026-77404

GHSA-465G-FH3V-9JW4

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