USN-8251-1

It was discovered that libpng incorrectly handled memory when processing certain PNG files. If a user or automated system were tricked into opening a specially crafted PNG file, an attacker could use this issue to cause libpng to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-33416)

It was discovered that libpng incorrectly handled expanding 8-bit paletted rows to RGB or RGBA on ARM processors. If a user or automated system were tricked into opening a specially crafted PNG file, an attacker could use this issue to cause libpng to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-33636)

It was discovered that libpng incorrectly handled certain setter APIs. An attacker could possibly use this issue to obtain sensitive information. (CVE-2026-34757)

References

Affected packages

Ubuntu:22.04:LTS / libpng1.6

Package

Name: libpng1.6
Purl: pkg:deb/ubuntu/libpng1.6@1.6.37-3ubuntu0.5?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.6.37-3ubuntu0.5

Affected versions

1.*

1.6.37-3build4

1.6.37-3build5

1.6.37-3ubuntu0.1

1.6.37-3ubuntu0.3

1.6.37-3ubuntu0.4

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libpng-tools",
            "binary_version": "1.6.37-3ubuntu0.5"
        },
        {
            "binary_name": "libpng16-16",
            "binary_version": "1.6.37-3ubuntu0.5"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8251-1.json"

cves_map

{
    "ecosystem": "Ubuntu:22.04:LTS",
    "cves": [
        {
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2026-33416"
        },
        {
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2026-33636"
        },
        {
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2026-34757"
        }
    ]
}

Ubuntu:24.04:LTS / libpng1.6

Package

Name: libpng1.6
Purl: pkg:deb/ubuntu/libpng1.6@1.6.43-5ubuntu0.6?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.6.43-5ubuntu0.6

Affected versions

1.*

1.6.40-1

1.6.40-2

1.6.40-3

1.6.42-1

1.6.43-1

1.6.43-3

1.6.43-5build1

1.6.43-5ubuntu0.1

1.6.43-5ubuntu0.3

1.6.43-5ubuntu0.4

1.6.43-5ubuntu0.5

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libpng-tools",
            "binary_version": "1.6.43-5ubuntu0.6"
        },
        {
            "binary_name": "libpng16-16t64",
            "binary_version": "1.6.43-5ubuntu0.6"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8251-1.json"

cves_map

{
    "ecosystem": "Ubuntu:24.04:LTS",
    "cves": [
        {
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2026-33416"
        },
        {
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2026-33636"
        },
        {
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2026-34757"
        }
    ]
}

Ubuntu:25.10 / libpng1.6

Package

Name: libpng1.6
Purl: pkg:deb/ubuntu/libpng1.6@1.6.50-1ubuntu0.5?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.6.50-1ubuntu0.5

Affected versions

1.*

1.6.47-1.1

1.6.48-1

1.6.49-1~exp1

1.6.50-1~exp1

1.6.50-1

1.6.50-1ubuntu0.1

1.6.50-1ubuntu0.3

1.6.50-1ubuntu0.4

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libpng-tools",
            "binary_version": "1.6.50-1ubuntu0.5"
        },
        {
            "binary_name": "libpng16-16t64",
            "binary_version": "1.6.50-1ubuntu0.5"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8251-1.json"

cves_map

{
    "ecosystem": "Ubuntu:25.10",
    "cves": [
        {
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2026-33416"
        },
        {
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2026-33636"
        },
        {
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2026-34757"
        }
    ]
}