Vulnerability-Lookup

CVE-2026-96609 (GCVE-0-2026-96609)

Vulnerability from cvelistv5 – Published: 2026-09-23 14:07 – Updated: 2026-09-23 15:22

Summary

Robur Albatross 1.0.0 through 2.x before 2.7.2 does not limit use of the ring buffer, leading to an albatross-console loop with no recognized termination condition. This is only exploitable by users who can send console subscription commands to unikernels that produce sufficient log output to fill the ring buffer (1024 lines). It is not exploitable by unauthorized clients.

Severity

7.1 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-23 15:21 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

mitre CNA under the mitre root

CNA scorecard E 29/100 over 2350 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/robur-coop/albatross/pull/273
https://osv.dev/vulnerability/OSEC-2026-09

Impacted products

1 product

Vendor	Product	Version	CPE status
Robur	Albatross	Affected: 1.0.0 , < 2.7.2 (semver)	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-96609

Vulnerability from fkie_nvd - Published: 2026-09-23 15:17 - Updated: 2026-09-24 21:08

Severity

7.1 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	cve@mitre.org	https://github.com/robur-coop/albatross/pull/273
	cve@mitre.org	https://osv.dev/vulnerability/OSEC-2026-09

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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GHSA-P97R-9RRC-GR9R

Vulnerability from github – Published: 2026-09-23 15:30 – Updated: 2026-09-23 15:30

Details

Severity

7.1 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

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  "id": "GHSA-p97r-9rrc-gr9r",
  "modified": "2026-09-23T15:30:50Z",
  "published": "2026-09-23T15:30:50Z",
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      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-96609"
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      "url": "https://github.com/robur-coop/albatross/pull/273"
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    }
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}

OSEC-2026-09 (CVE-2026-96609)

Vulnerability from osv_ocaml – Published: 2026-05-28 08:59 – Updated: 2026-09-23 15:23 – Source website

Summary

Albatross-console memory exhaustion

Details

Albatross-console doesn't properly terminate when looping over the ringbuffer. This leads to denial of service and memory exhaustion.

Scenario

A user that has access to albatross-console either via the unix domain socket (requires root:albatross by default) or via albatross-tls-endpoint (requires a valid certificate and a running unikernel) can send a specially crafted query for console logs that will make albatross-console hang and eventually exhaust memory.

Detailed description

Albatross-console receives console messages from running unikernels via named pipes. These console messages are stored in memory in a ring buffer with a non-configurable default size of 1024 lines. A client query the console output of a unikernel with either a count or a timestamp for limiting the output. A bug in the ring buffer logic exists so that when the ring buffer is full (has 1024 lines) the termination logic doesn't work properly.

When using a timestamp to limit then a timestamp earlier than all recorded console output in the ring buffer bypasses the termination logic, and albatross-console will repeatedly loop over the ring buffer accumulating the entries in a list indefinitely eventually exhausting memory.

If using a count the termination logic doesn't take into consideration how many entries there actually are if the ring buffer is full. Using a very large or negative count will make albatross-console loop over the ring buffer accumulating entries in a list until the length of the list equals the requested count (an OCaml int). As this could be max_int or -1 this would exhaust memory, too.

Scope

The bug was introduced in 8a113e5ce07f062c701abb1c09ba3ce3147db867 and affected versions are v1.0.0 through v2.7.1. The vulnerability is only exploitable to users who can send console subscription commands to unikernels that produce sufficient log output to fill the ring buffer (1024 lines). It is not exploitable by unauthorized clients.

Severity

4.9 (Medium)


                    
                      CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U

Credits

Reynir Björnsson

Edwin Török

References

URL

Type

https://github.com/robur-coop/albatross/pull/273

FIX

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "opam_constraint": "albatross {\u003e= \"1.0.0\" \u0026 \u003c \"2.7.2\"}"
      },
      "package": {
        "ecosystem": "opam",
        "name": "albatross",
        "purl": "pkg:opam/albatross"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.0.0"
            },
            {
              "fixed": "2.7.2"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "e07de2a904133e633773302d335ceb1f2c9945da"
            }
          ],
          "repo": "https://git.robur.coop/robur/albatross.git",
          "type": "GIT"
        }
      ],
      "versions": [
        "1.0.1",
        "1.1.0",
        "1.1.1",
        "1.2.0",
        "1.3.0",
        "1.3.1",
        "1.4.0",
        "1.4.1",
        "1.4.2",
        "1.4.3",
        "1.5.0",
        "1.5.1",
        "1.5.2",
        "1.5.3",
        "1.5.4",
        "1.5.5",
        "1.5.6",
        "2.0.0",
        "2.1.0",
        "2.2.0",
        "2.3.0",
        "2.4.0",
        "2.4.1",
        "2.5.0",
        "2.5.1",
        "2.6.0",
        "2.6.1",
        "2.6.2",
        "2.7.0",
        "2.7.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-96609"
  ],
  "credits": [
    {
      "name": "Reynir Bj\u00f6rnsson",
      "type": "REPORTER"
    },
    {
      "name": "Reynir Bj\u00f6rnsson",
      "type": "REMEDIATION_DEVELOPER"
    },
    {
      "name": "Edwin T\u00f6r\u00f6k",
      "type": "COORDINATOR"
    }
  ],
  "database_specific": {
    "cwe": [
      "CWE-770",
      "CWE-405"
    ],
    "human_link": "https://github.com/ocaml/security-advisories/tree/main/advisories/2026/OSEC-2026-09.md",
    "osv": "https://github.com/ocaml/security-advisories/tree/generated-osv/2026/OSEC-2026-09.json"
  },
  "details": "Albatross-console doesn\u0027t properly terminate when looping over the ringbuffer. This leads to denial of service and memory exhaustion.\n\n## Scenario\n\nA user that has access to albatross-console either via the unix domain socket (requires root:albatross by default) or via albatross-tls-endpoint (requires a valid certificate and a running unikernel) can send a specially crafted query for console logs that will make albatross-console hang and eventually exhaust memory.\n\n## Detailed description\n\nAlbatross-console receives console messages from running unikernels via named pipes. These console messages are stored in memory in a ring buffer with a non-configurable default size of 1024 lines. A client query the console output of a unikernel with either a count or a timestamp for limiting the output. A bug in the ring buffer logic exists so that when the ring buffer is full (has 1024 lines) the termination logic doesn\u0027t work properly.\n\nWhen using a timestamp to limit then a timestamp earlier than all recorded console output in the ring buffer bypasses the termination logic, and albatross-console will repeatedly loop over the ring buffer accumulating the entries in a list indefinitely eventually exhausting memory.\n\nIf using a count the termination logic doesn\u0027t take into consideration how many entries there actually are if the ring buffer is full. Using a very large or negative count will make albatross-console loop over the ring buffer accumulating entries in a list until the length of the list equals the requested count (an OCaml int). As this could be max_int or -1 this would exhaust memory, too.\n\n## Scope\n\nThe bug was introduced in 8a113e5ce07f062c701abb1c09ba3ce3147db867 and affected versions are v1.0.0 through v2.7.1. The vulnerability is only exploitable to users who can send console subscription commands to unikernels that produce sufficient log output to fill the ring buffer (1024 lines). It is not exploitable by unauthorized clients.",
  "id": "OSEC-2026-09",
  "modified": "2026-09-23T15:23:50Z",
  "published": "2026-05-28T08:59:44Z",
  "references": [
    {
      "type": "FIX",
      "url": "https://github.com/robur-coop/albatross/pull/273"
    }
  ],
  "schema_version": "1.7.4",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Albatross-console memory exhaustion"
}

Sightings

Author	Source	Type	Date	Other

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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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.

Action not permitted

CVE-2026-96609 (GCVE-0-2026-96609)

FKIE_CVE-2026-96609

GHSA-P97R-9RRC-GR9R

OSEC-2026-09 (CVE-2026-96609)

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