CVE-2026-73639

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Source

https://cve.org/CVERecord?id=CVE-2026-73639

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73639.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-73639

Aliases

GHSA-jhx5-34j8-9g88

Downstream

Published

2026-09-17T21:18:59Z

Modified

2026-10-28T11:12:17Z

Severity

9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H CVSS Calculator

Summary

Imager::File::PNG versions from 1.003 before 1.004 for Perl write past the end of the row buffer reading a PNG with a tRNS transparency chunk in read_direct8

Details

Imager::File::PNG versions from 1.003 before 1.004 for Perl write past the end of the row buffer reading a PNG with a tRNS transparency chunk in read_direct8.

With a tRNS chunk, read_direct8() adds an alpha channel to the image it creates but still sizes the row buffer from the original channel count. libpng expands the transparency into that extra channel, so png_read_row() fills one channel more than the buffer holds, at one byte per sample, and writes width bytes past the end of the allocation. Palette images go to read_paletted() and 16-bit images to read_direct16(), which sizes its buffer from png_get_rowbytes() and allocates enough for the expanded row.

The same reader ships bundled in the Imager distribution.

Reading an attacker-supplied PNG through Imager->read() corrupts the heap, which can crash the process.

Database specific

{
    "cna_assigner": "CPANSec",
    "cwe_ids": [
        "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73639.json"
}

References

Affected packages

Git / github.com/tonycoz/imager

Affected ranges

Type

GIT

Repo

https://github.com/tonycoz/imager

Events

Introduced

0d1baac8f8b1d3f15a77cc907f7cebccf74b9176

Fixed

396eb238f041bfe959fe5bbe86e97af107d2276e

Introduced

289518caad4149b3019e6fc865d669239b96ccbf

Fixed

f6a3d06f24ac8ec0693721decbc1cddcd0d35a41

Fixed

d973bd7e8843f084e8071caa24b89545c88b1e4b

Database specific

Show details

{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "1.003"
                },
                {
                    "fixed": "1.004"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandardRange"
        },
        {
            "range": [
                {
                    "introduced": "1.034"
                },
                {
                    "fixed": "1.035"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandardRange"
        },
        {
            "range": [
                {
                    "fixed": "d973bd7e8843f084e8071caa24b89545c88b1e4b"
                }
            ],
            "source": "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

v1.*

v1.003

v1.034

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73639.json"

vanir_signatures

[
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            "threshold": 0.9
        },
        "id": "CVE-2026-73639-13f30347",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/tonycoz/imager/commit/d973bd7e8843f084e8071caa24b89545c88b1e4b",
        "target": {
            "file": "PNG/impng.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "260934713903637319983164023601036569336",
            "length": 1348
        },
        "id": "CVE-2026-73639-1fcd2214",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/tonycoz/imager/commit/d973bd7e8843f084e8071caa24b89545c88b1e4b",
        "target": {
            "file": "PNG/impng.c",
            "function": "read_direct8"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "270705117611937489761237429365226659381",
            "length": 1709
        },
        "id": "CVE-2026-73639-395624fa",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/tonycoz/imager/commit/d973bd7e8843f084e8071caa24b89545c88b1e4b",
        "target": {
            "file": "PNG/impng.c",
            "function": "read_direct16"
        }
    }
]

vanir_signatures_modified

"2026-10-28T11:12:17Z"