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FKIE_CVE-2026-52720

Vulnerability from fkie_nvd - Published: 2026-06-15 20:16 - Updated: 2026-08-03 13:18
Summary
A heap buffer overflow vulnerability was found in GStreamer's librfb (RFB/VNC client). The rectangle bounds check incorrectly validates area rather than individual dimensions, allowing a malicious VNC server to send a rectangle that extends beyond the framebuffer. A remote attacker could set up a malicious VNC server and trick a user into connecting, resulting in an out-of-bounds heap write that could lead to code execution or a crash.
References
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:36749
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:36834
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:37130
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:47069
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:47070
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:47071
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:47075
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:47076
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:47176
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:47717
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:47718
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:49517
secalert@redhat.comhttps://access.redhat.com/security/cve/CVE-2026-52720
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2486731
secalert@redhat.comhttps://gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5105
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:36749
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:36834
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:37130
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:47069
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:47070
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:47071
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:47075
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:47076
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:47176
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:47717
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:47718
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:49517
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/security/cve/CVE-2026-52720
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://bugzilla.redhat.com/show_bug.cgi?id=2486731
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52720.json
Impacted products
Vendor Product Version

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          "product": "Red Hat Enterprise Linux 7",
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      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A heap buffer overflow vulnerability was found in GStreamer\u0027s librfb (RFB/VNC client). The rectangle bounds check incorrectly validates area rather than individual dimensions, allowing a malicious VNC server to send a rectangle that extends beyond the framebuffer. A remote attacker could set up a malicious VNC server and trick a user into connecting, resulting in an out-of-bounds heap write that could lead to code execution or a crash."
    }
  ],
  "id": "CVE-2026-52720",
  "lastModified": "2026-08-03T13:18:48.063",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
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  "vulnStatus": "Awaiting Analysis",
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          "value": "CWE-122"
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  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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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Detection rules are retrieved from Rulezet.

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Related by attack behaviour

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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