CVE-2025-20260

A vulnerability in the PDF scanning processes of ClamAV could allow an unauthenticated, remote attacker to cause a buffer overflow condition, cause a denial of service (DoS) condition, or execute arbitrary code on an affected device.

This vulnerability exists because memory buffers are allocated incorrectly when PDF files are processed. An attacker could exploit this vulnerability by submitting a crafted PDF file to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to trigger a buffer overflow, likely resulting in the termination of the ClamAV scanning process and a DoS condition on the affected software. Although unproven, there is also a possibility that an attacker could leverage the buffer overflow to execute arbitrary code with the privileges of the ClamAV process.

References

Affected packages

Git / github.com/cisco-talos/clamav

Affected ranges

Type: GIT
Repo: https://github.com/cisco-talos/clamav
Events: Fixed

5d78e4e470a361ac8378582ad15df39a54724856

Introduced

7d26bc8f6a801bb35ff7f2b154f33817e5863ea6

Fixed

d8b053865fd5995f7af98bfbcd98c9a5644bfe2b

Affected versions

clamav-1.*

clamav-1.2.0

clamav-1.3.0

clamav-1.3.0-rc

clamav-1.3.0-rc2

clamav-1.4.0

clamav-1.4.0-rc

clamav-1.4.1

clamav-1.4.2

Database specific

vanir_signatures

[
    {
        "signature_type": "Line",
        "source": "https://github.com/cisco-talos/clamav/commit/d8b053865fd5995f7af98bfbcd98c9a5644bfe2b",
        "target": {
            "file": "libclamav/bytecode_api.h"
        },
        "id": "CVE-2025-20260-18de29da",
        "signature_version": "v1",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "190015530276357700342780865688785711289",
                "90010761790201096885469837227264413727",
                "54157981050440576534464352548040004529",
                "229169483082172892455379641560317814455"
            ]
        },
        "deprecated": false
    },
    {
        "signature_type": "Line",
        "source": "https://github.com/cisco-talos/clamav/commit/5d78e4e470a361ac8378582ad15df39a54724856",
        "target": {
            "file": "libclamav/bytecode_api.h"
        },
        "id": "CVE-2025-20260-383ac386",
        "signature_version": "v1",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "245627585582999367730498144422284385312",
                "169380276957306351202470795207712565794",
                "80297130972065281316949368032819890935",
                "8935701276241068953479600026712026932"
            ]
        },
        "deprecated": false
    }
]

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-20260.json"