Vulnerability-Lookup

CVE-2025-27421 (GCVE-0-2025-27421)

Vulnerability from cvelistv5 – Published: 2025-03-03 16:19 – Updated: 2025-03-03 16:41

Title

Goroutine Leak in Abacus SSE Implementation

Summary

Abacus is a highly scalable and stateless counting API. A critical goroutine leak vulnerability has been identified in the Abacus server's Server-Sent Events (SSE) implementation. The issue occurs when clients disconnect from the /stream endpoint, as the server fails to properly clean up resources and terminate associated goroutines. This leads to resource exhaustion where the server continues running but eventually stops accepting new SSE connections while maintaining high memory usage. The vulnerability specifically involves improper channel cleanup in the event handling mechanism, causing goroutines to remain blocked indefinitely. This vulnerability is fixed in 1.4.0.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-03-03 16:40 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption
CWE-772 - Missing Release of Resource after Effective Lifetime

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7814 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/JasonLovesDoggo/abacus/securit…	x_refsource_CONFIRM
https://github.com/JasonLovesDoggo/abacus/commit/…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
JasonLovesDoggo	abacus	Affected: < 1.4.0	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2025-27421

Vulnerability from fkie_nvd - Published: 2025-03-03 17:15 - Updated: 2026-06-17 09:03

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/JasonLovesDoggo/abacus/commit/898ff1204e11317cc161240b660e63eed5a72b33
	security-advisories@github.com	https://github.com/JasonLovesDoggo/abacus/security/advisories/GHSA-vh64-54px-qgf8

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "affected": [
    {
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          "product": "abacus",
          "vendor": "JasonLovesDoggo",
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    },
    {
      "lang": "es",
      "value": "Abacus es una API de conteo altamente escalable y sin estado. Se ha identificado una vulnerabilidad cr\u00edtica de fuga de goroutines en la implementaci\u00f3n de eventos enviados por el servidor (SSE) del servidor Abacus. El problema ocurre cuando los clientes se desconectan del endpoint /stream, ya que el servidor no depura adecuadamente los recursos ni termina los goroutines asociados. Esto provoca el agotamiento de los recursos, donde el servidor contin\u00faa ejecut\u00e1ndose pero finalmente deja de aceptar nuevas conexiones SSE mientras mantiene un alto uso de memoria. La vulnerabilidad involucra espec\u00edficamente una limpieza de canal incorrecta en el mecanismo de gesti\u00f3n de eventos, lo que hace que los goroutines permanezcan bloqueados indefinidamente. Esta vulnerabilidad se solucion\u00f3 en 1.4.0."
    }
  ],
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GHSA-VH64-54PX-QGF8

Vulnerability from github – Published: 2025-03-03 16:21 – Updated: 2025-03-11 17:17

Summary

Goroutine Leak in Abacus SSE Implementation

Details

Goroutine Leak in Abacus SSE Implementation

Summary

A critical goroutine leak vulnerability has been identified in the Abacus server's Server-Sent Events (SSE) implementation. The issue occurs when clients disconnect from the /stream endpoint, as the server fails to properly clean up resources and terminate associated goroutines. This leads to resource exhaustion where the server continues running but eventually stops accepting new SSE connections while maintaining high memory usage. The vulnerability specifically involves improper channel cleanup in the event handling mechanism, causing goroutines to remain blocked indefinitely.

POC

Impact

This vulnerability affects all versions of Abacus prior to v1.4.0. The issue causes:

Permanent unresponsiveness of the /stream endpoint after prolonged use
Memory growth that stabilizes at a high level but prevents proper functionality
Selective denial of service affecting only SSE connections while other endpoints remain functional
Accumulated orphaned goroutines that cannot be garbage collected
High resource consumption under sustained client connection/disconnection patterns

Systems running Abacus in production with client applications that frequently establish and terminate SSE connections are most vulnerable. The issue becomes particularly apparent in high-traffic environments or during connection stress testing.

Patches

The vulnerability has been patched in Abacus v1.4.0. The fix includes:

Implementing buffered channels to prevent blocking operations during cleanup
Adding proper mutex-protected cleanup logic to ensure resources are released exactly once
Implementing timeout protection for channel operations to prevent deadlocks
Ensuring consistent cleanup when connections terminate unexpectedly
Adding improved monitoring for client disconnections using request context
Restructuring the event broadcasting system to safely handle client removal

Users should upgrade to v1.4.0 or later versions as soon as possible.

Workarounds

If upgrading is not immediately possible, the following workarounds can help mitigate the issue:

Limit maximum connections: Configure your reverse proxy to limit the maximum number of concurrent connections to the /stream endpoints.
Implement request timeouts: Configure your infrastructure to terminate long-lived SSE connections after a reasonable period.
Restart regularly: Schedule regular restarts of the Abacus service to reclaim resources.
Monitor memory usage: Set up alerts for abnormal memory growth patterns.
Separate instance for SSE: Run a dedicated Abacus instance solely for handling SSE connections, allowing it to be restarted without affecting the main API functionality.

References

For More Information

Please contact the Abacus security team at abacus@jsn.cam for additional information or to report further security issues.

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

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    "severity": "HIGH"
  },
  "details": "## Goroutine Leak in Abacus SSE Implementation\n\n### Summary\n\nA critical goroutine leak vulnerability has been identified in the Abacus server\u0027s Server-Sent Events (SSE) implementation. The issue occurs when clients disconnect from the `/stream` endpoint, as the server fails to properly clean up resources and terminate associated goroutines. This leads to resource exhaustion where the server continues running but eventually stops accepting new SSE connections while maintaining high memory usage. The vulnerability specifically involves improper channel cleanup in the event handling mechanism, causing goroutines to remain blocked indefinitely.\n\n### [POC](https://github.com/JasonLovesDoggo/abacus/blob/main/docs/bugs/GHSA-vh64-54px-qgf8/test.py)\n\n### Impact\n\nThis vulnerability affects all versions of Abacus prior to v1.4.0. The issue causes:\n\n- Permanent unresponsiveness of the `/stream` endpoint after prolonged use\n- Memory growth that stabilizes at a high level but prevents proper functionality\n- Selective denial of service affecting only SSE connections while other endpoints remain functional\n- Accumulated orphaned goroutines that cannot be garbage collected\n- High resource consumption under sustained client connection/disconnection patterns\n\nSystems running Abacus in production with client applications that frequently establish and terminate SSE connections are most vulnerable. The issue becomes particularly apparent in high-traffic environments or during connection stress testing.\n\n### Patches\n\nThe vulnerability has been patched in Abacus v1.4.0. The fix includes:\n\n1. Implementing buffered channels to prevent blocking operations during cleanup\n2. Adding proper mutex-protected cleanup logic to ensure resources are released exactly once\n3. Implementing timeout protection for channel operations to prevent deadlocks\n4. Ensuring consistent cleanup when connections terminate unexpectedly\n5. Adding improved monitoring for client disconnections using request context\n6. Restructuring the event broadcasting system to safely handle client removal\n\nUsers should upgrade to v1.4.0 or later versions as soon as possible.\n\n### Workarounds\n\nIf upgrading is not immediately possible, the following workarounds can help mitigate the issue:\n\n1. **Limit maximum connections**: Configure your reverse proxy to limit the maximum number of concurrent connections to the `/stream` endpoints.\n\n2. **Implement request timeouts**: Configure your infrastructure to terminate long-lived SSE connections after a reasonable period.\n\n3. **Restart regularly**: Schedule regular restarts of the Abacus service to reclaim resources.\n\n4. **Monitor memory usage**: Set up alerts for abnormal memory growth patterns.\n\n5. **Separate instance for SSE**: Run a dedicated Abacus instance solely for handling SSE connections, allowing it to be restarted without affecting the main API functionality.\n\n### References\n\n- [Go Concurrency Patterns: Context](https://blog.golang.org/context)\n- [CWE-772: Missing Release of Resource after Effective Lifetime](https://cwe.mitre.org/data/definitions/772.html)\n- [OWASP Top 10: Resource Exhaustion](https://owasp.org/www-project-top-ten/2017/A5_2017-Broken_Access_Control)\n- [Resource Management in Go](https://go.dev/blog/defer-panic-and-recover)\n\n### For More Information\n\nPlease contact the Abacus security team at abacus@jsn.cam for additional information or to report further security issues.",
  "id": "GHSA-vh64-54px-qgf8",
  "modified": "2025-03-11T17:17:30Z",
  "published": "2025-03-03T16:21:46Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/JasonLovesDoggo/abacus/security/advisories/GHSA-vh64-54px-qgf8"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-27421"
    },
    {
      "type": "WEB",
      "url": "https://github.com/JasonLovesDoggo/abacus/commit/78fdb9b48b7f6d08ed0cd41077509c0a97071552"
    },
    {
      "type": "WEB",
      "url": "https://github.com/JasonLovesDoggo/abacus/commit/898ff1204e11317cc161240b660e63eed5a72b33"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/JasonLovesDoggo/abacus"
    },
    {
      "type": "WEB",
      "url": "https://pkg.go.dev/vuln/GO-2025-3498"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Goroutine Leak in Abacus SSE Implementation"
}

OPENSUSE-SU-2025:14889-1

Vulnerability from csaf_opensuse - Published: 2025-03-13 00:00 - Updated: 2026-09-20 21:29

Summary

govulncheck-vulndb-0.0.20250312T181707-1.1 on GA media

Severity

Moderate

Scope

31 vulnerabilities in this advisory, including CVE-2025-27421.

CVE-2025-27421

Recommended: 4 products

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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.

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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.
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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.

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CVE-2025-27421 (GCVE-0-2025-27421)

FKIE_CVE-2025-27421

GHSA-VH64-54PX-QGF8

Goroutine Leak in Abacus SSE Implementation

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POC

Impact

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For More Information

OPENSUSE-SU-2025:14889-1

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