Vulnerability-Lookup

GHSA-3V92-8994-JG8P

Vulnerability from github – Published: 2026-07-08 12:30 – Updated: 2026-07-08 12:30

Details

A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in libXfont2 ComputeScaledProperties() before libXfont2 before 2.0.8 could be used by attackers using authenticated X clients to execute code within the X server.

Severity

8.5 (High)


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

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  "affected": [],
  "aliases": [
    "CVE-2026-56003"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-122"
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    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-08T10:16:23Z",
    "severity": "HIGH"
  },
  "details": "A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in libXfont2 ComputeScaledProperties() before libXfont2 before 2.0.8 could be used by attackers using authenticated X clients to execute code within the X server.",
  "id": "GHSA-3v92-8994-jg8p",
  "modified": "2026-07-08T12:30:24Z",
  "published": "2026-07-08T12:30:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56003"
    },
    {
      "type": "WEB",
      "url": "https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/dff957a5158da038a282a59a31fe736702732939"
    },
    {
      "type": "WEB",
      "url": "https://www.openwall.com/lists/oss-security/2026/07/08/1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
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      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-56003 (GCVE-0-2026-56003)

Vulnerability from cvelistv5 – Published: 2026-07-08 09:25 – Updated: 2026-07-08 12:06

Title

libXfont2 computeProps Property Buffer Heap Buffer Overflow

Summary

Severity

8.5 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-122 - Heap-based buffer overflow

Assigner

suse

References

2 references

URL	Tags
https://www.openwall.com/lists/oss-security/2026/…	vendor-advisory
https://gitlab.freedesktop.org/xorg/lib/libxfont/…	patch

Impacted products

1 product

Vendor	Product	Version
X.Org	libXfont2	Affected: 0 , < 2.0.8 (rpm)

Date Public

2026-07-08 09:22

Credits

Anonymous working with Trend Micro Zero Day Initiative

Show details on NVD website

JSON

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  "containers": {
    "adp": [
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        "metrics": [
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                "options": [
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                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-08T12:06:32.424595Z",
                "version": "2.0.3"
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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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-3V92-8994-JG8P

CVE-2026-56003 (GCVE-0-2026-56003)

Tags

Sightings

Nomenclature