CVE-2026-56002

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Source
https://cve.org/CVERecord?id=CVE-2026-56002
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56002.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-56002
Downstream
ALSA (3)
AZL (1)
BELL (1)
DEBIAN (1)
ECHO (1)
MGASA (1)
OESA (1)
openSUSE (2)
RHSA (11)
RLSA (3)
ROOT (1)
SUSE (3)
UBUNTU (1)
Related
ALSA (3)
openSUSE (2)
SUSE (3)
Published
2026-07-08T09:12:51Z
Modified
2026-10-28T11:15:09Z
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 PCF Font Parsing Heap Buffer Overflow
Details

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.

Database specific 
{
    "cna_assigner":  "suse",
    "cwe_ids":  [
        "CWE-122"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56002.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "range":  [
                        {
                            "fixed":  "2.0.8"
                        }
                    ],
                    "source":  "AFFECTED_FIELD",
                    "strategy":  "StandardRange"
                }
            ]
        },
        {
            "extracted_events":  [
                {
                    "range":  [
                        {
                            "fixed":  "2.0.8"
                        }
                    ],
                    "source":  "CPE_FIELD",
                    "strategy":  "CPEApplicability"
                }
            ]
        },
        {
            "extracted_events":  [
                {
                    "range":  [
                        {
                            "introduced":  "2"
                        },
                        {
                            "fixed":  "2.0.8"
                        }
                    ],
                    "source":  "DESCRIPTION"
                }
            ]
        }
    ]
}
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
b4389e0b1d84a690b819bb27b1439968811a3674
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "fixed":  "b4389e0b1d84a690b819bb27b1439968811a3674"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        }
    ]
}

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

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56002.json"
vanir_signatures 
[
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "334503167558119516687293928712017715250",
            "length":  7628
        },
        "id":  "CVE-2026-56002-4cd74a5d",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://gitlab.freedesktop.org/xorg/lib/libxfont@b4389e0b1d84a690b819bb27b1439968811a3674",
        "target":  {
            "file":  "src/bitmap/pcfread.c",
            "function":  "pcfReadFont"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "94308441174312847163841749977589064775",
                "239827268978304756525877760395341272264",
                "39180096570880284336899292893320227486",
                "164202654700386688468568112948231238657",
                "132825174673766179793744416882795473135",
                "182340606182191946883203284692891546561",
                "123593229624146875124693719496758313055",
                "81844944000283088328367190623653839196",
                "154893042750911937980029914001110128969",
                "254347970791264304494612095472715107217",
                "103744702434009529125287082283474469928",
                "242177383803053950299225862384570135210",
                "140110450381834962593482294587624015503",
                "327592201104184951877522503397510411871",
                "99278608761210584387895879108219399688",
                "235067986151849149983591217081808363138",
                "237108803318002709353920529042703918261",
                "101150618501974925289484749343603010746",
                "173827949564481537185557416242629396842",
                "129214077380723863624108380139661330148",
                "29505612783824734058486572957240113867",
                "305568599936473833978765538054421334090",
                "54873407941747098721867561992746595592",
                "126431603276316972614183064459114866599",
                "204363224326101919509618678753018967014",
                "239774724083743743569281429748372000268"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-56002-9f2188f2",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://gitlab.freedesktop.org/xorg/lib/libxfont@b4389e0b1d84a690b819bb27b1439968811a3674",
        "target":  {
            "file":  "src/bitmap/pcfread.c"
        }
    }
]
vanir_signatures_modified 
"2026-10-28T11:15:09Z"