Vulnerability-Lookup

rlsa-2026:47103

Vulnerability from osv_rocky

Published

2026-07-29 06:01

Modified

2026-07-29 12:08

Summary

Important: libXfont2 security update

Details

X.Org X11 libXfont2 runtime library

Security Fix(es):

libXfont2: BitmapScaleBitmaps Integer Overflow Heap Buffer Overflow (CVE-2026-56001)
libXfont2: PCF Font Parsing Heap Buffer Overflow (CVE-2026-56002)
libXfont2: computeProps Property Buffer Heap Buffer Overflow (CVE-2026-56003)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Severity

7.3 (High)


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

Credits

Rocky Enterprise Software Foundation

Red Hat

References

URL

Type

	https://errata.rockylinux.org/RLSA-2026:47103	ADVISORY
	https://bugzilla.redhat.com/show_bug.cgi?id=2496640	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2496641	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2496642	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Rocky Linux:8",
        "name": "libXfont2",
        "purl": "pkg:rpm/rocky-linux/libXfont2?distro=rocky-linux-8\u0026epoch=0"
      },
      "ranges": [
        {
          "database_specific": {
            "yum_repository": "AppStream"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0:2.0.3-2.el8_10.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [
    {
      "name": "Rocky Enterprise Software Foundation"
    },
    {
      "name": "Red Hat"
    }
  ],
  "details": "X.Org X11 libXfont2 runtime library\n\nSecurity Fix(es):\n\n* libXfont2: BitmapScaleBitmaps Integer Overflow Heap Buffer Overflow (CVE-2026-56001)\n\n* libXfont2: PCF Font Parsing Heap Buffer Overflow (CVE-2026-56002)\n\n* libXfont2: computeProps Property Buffer Heap Buffer Overflow (CVE-2026-56003)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
  "id": "RLSA-2026:47103",
  "modified": "2026-07-29T12:08:44.799597Z",
  "published": "2026-07-29T06:01:13.165159Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://errata.rockylinux.org/RLSA-2026:47103"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2496640"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2496641"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2496642"
    }
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      "type": "CVSS_V3"
    }
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  "upstream": [
    "CVE-2026-56001",
    "CVE-2026-56002",
    "CVE-2026-56003"
  ]
}

CVE-2026-56001 (GCVE-0-2026-56001)

Vulnerability from cvelistv5 – Published: 2026-07-08 08:49 – Updated: 2026-07-09 03:55

Title

libXfont2 BitmapScaleBitmaps Integer Overflow Heap Buffer Overflow

Summary

A heap buffer overflow in BitmapScaleBitmaps in libXfont2 before 2.0.8 due to an overflowing 32bit size could be used by attackers able to access the X Server to execute code within the X server cont

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 08:15

Credits

Anonymous working with Trend Micro Zero Day Initiative.

Show details on NVD website

JSON

To clipboard

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CVE-2026-56002 (GCVE-0-2026-56002)

Vulnerability from cvelistv5 – Published: 2026-07-08 09:12 – Updated: 2026-07-09 03:55

Title

libXfont2 PCF Font Parsing Heap Buffer Overflow

Summary

A heap bufferflow in pcfReadFont() due to missing glyph bounds checking in libXfont2 before 2.0.8 allows attackers authenticated as X client 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

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

Impacted products

1 product

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

Date Public

2026-07-08 09:08

Credits

Anonymous working with Trend Micro Zero Day Initiative.

Show details on NVD website

JSON

To clipboard

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

Vulnerability from cvelistv5 – Published: 2026-07-08 09:25 – Updated: 2026-07-09 03:55

Title

libXfont2 computeProps Property Buffer Heap Buffer Overflow

Summary

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

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

To clipboard

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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.

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.

Action not permitted

rlsa-2026:47103

Vulnerability from osv_rocky

CVE-2026-56001 (GCVE-0-2026-56001)

CVE-2026-56002 (GCVE-0-2026-56002)

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

Tags

Sightings

Nomenclature