CVE-2026-56001

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Source
https://cve.org/CVERecord?id=CVE-2026-56001
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-56001.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-56001
Downstream
Related
Published
2026-07-08T08:49:24.706Z
Modified
2026-07-29T15:44:12.813899386Z
Severity
  • 8.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
Summary
libXfont2 BitmapScaleBitmaps Integer Overflow Heap Buffer Overflow
Details

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

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56001.json",
    "cna_assigner": "suse",
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "fixed": "2.0.8"
                }
            ]
        },
        {
            "source": "DESCRIPTION",
            "extracted_events": [
                {
                    "introduced": "libXfont2"
                },
                {
                    "fixed": "2.0.8"
                }
            ]
        }
    ],
    "cwe_ids": [
        "CWE-122"
    ]
}
References

Affected packages

Git / gitlab.freedesktop.org/xorg/lib/libxfont

Affected ranges

Type
GIT
Repo
https://gitlab.freedesktop.org/xorg/lib/libxfont
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
be0b08e2d354138d3222b4490e2a77c6ee42f778
Database specific 
{
    "source": "REFERENCES"
}

Affected versions

Other
MODULAR_COPY
PRE_xf86-4_3_0_1
XACE-SELINUX-MERGE
XORG-6_7_99_1
XORG-6_7_99_2
XORG-6_7_99_901
XORG-6_7_99_902
XORG-6_7_99_903
XORG-6_7_99_904
XORG-6_8_0
XORG-6_8_1
XORG-6_8_1_901
XORG-6_8_1_902
XORG-6_8_99_1
XORG-6_8_99_10
XORG-6_8_99_11
XORG-6_8_99_12
XORG-6_8_99_13
XORG-6_8_99_14
XORG-6_8_99_15
XORG-6_8_99_16
XORG-6_8_99_2
XORG-6_8_99_3
XORG-6_8_99_4
XORG-6_8_99_5
XORG-6_8_99_6
XORG-6_8_99_7
XORG-6_8_99_8
XORG-6_8_99_9
XORG-6_8_99_900
XORG-6_8_99_901
XORG-6_8_99_902
XORG-6_8_99_903
XORG-6_99_99_900
XORG-6_99_99_901
XORG-6_99_99_902
XORG-6_99_99_903
XORG-6_99_99_904
XORG-7_0
XORG-7_0_99_901
XORG-7_1
XORG-MAIN
lg3d-base
lg3d-rel-0-7-0
libxfont-1_1_0
rel-0-6-1
sco_port_update-base
xf86-012804-2330
xf86-4_3_0_1
xf86-4_3_99_16
xf86-4_3_99_901
xf86-4_3_99_902
xf86-4_3_99_903
xf86-4_3_99_903_special
xf86-4_4_0
xf86-4_4_99_1
libXfont-1.*
libXfont-1.2.0
libXfont-1.2.3
libXfont-1.2.4
libXfont-1.2.5
libXfont-1.2.6
libXfont-1.2.7
libXfont-1.2.8
libXfont-1.2.9
libXfont-1.3.0
libXfont-1.3.1
libXfont-1.3.2
libXfont-1.3.3
libXfont-1.3.4
libXfont-1.4.0
libXfont-1.4.1
libXfont-1.4.2
libXfont-1.4.3
libXfont-1.4.4
libXfont-1.4.5
libXfont-1.4.6
libXfont-1.4.7
libXfont-1.4.99.901
libXfont-1.5.0
libXfont-1.5.1
libXfont2-2.*
libXfont2-2.0.0
libXfont2-2.0.1
libXfont2-2.0.2
libXfont2-2.0.3
libXfont2-2.0.4
libXfont2-2.0.5
libXfont2-2.0.6
libXfont2-2.0.7

Database specific

vanir_signatures 
[
    {
        "signature_version": "v1",
        "source": "https://gitlab.freedesktop.org/xorg/lib/libxfont@be0b08e2d354138d3222b4490e2a77c6ee42f778",
        "id": "CVE-2026-56001-8b92821e",
        "deprecated": false,
        "target": {
            "file": "src/bitmap/bitscale.c"
        },
        "digest": {
            "line_hashes": [
                "81295832933059718242031918937967158609",
                "117351198260482526606862390848402423944",
                "309070136679589565329343601092568457025",
                "3620659586663916947820172590024802752",
                "76452448487668046537646664631816832976",
                "150931947096148130537009158871228040393",
                "149522414296942960678163557134754967866",
                "332632198256573217654352487046950557483",
                "69975855321594254990592396698492680946"
            ],
            "threshold": 0.9
        },
        "signature_type": "Line"
    },
    {
        "signature_version": "v1",
        "source": "https://gitlab.freedesktop.org/xorg/lib/libxfont@be0b08e2d354138d3222b4490e2a77c6ee42f778",
        "id": "CVE-2026-56001-a1e2a063",
        "deprecated": false,
        "digest": {
            "length": 1559.0,
            "function_hash": "279086860560038143974252467593032163021"
        },
        "target": {
            "function": "BitmapScaleBitmaps",
            "file": "src/bitmap/bitscale.c"
        },
        "signature_type": "Function"
    }
]
source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-56001.json"
vanir_signatures_modified 
"2026-07-14T20:30:42Z"